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LHCb: status and perspectives. Yu. Guz, IHEP, Protvino on behalf of the LHCb collaboration. LHCb detector status Key measurements LHCb upgrade issues Conclusions. LHCb: A Large Hadron Collider experiment for Precision Measurements of CP Violation and Rare Decays - PowerPoint PPT Presentation
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1
LHCb status and perspectives
Yu Guz IHEP Protvino
on behalf of the LHCb collaboration
1 LHCb detector status
2 Key measurements
3 LHCb upgrade issues
4 Conclusions
2
LHCb A Large Hadron Collider experiment for PrecisionLHCb A Large Hadron Collider experiment for Precision Measurements of CP Violation and Rare Decays Measurements of CP Violation and Rare Decays
gt700 gt700 physicists physicists 50 institutes 15 50 institutes 15 countriescountries
ATLASATLAS
ALICEALICECMSCMS
3
LHCb experiment
Pythia
100μb
230μb
η of B-hadronP
T o
f B
-ha
dro
n
bb angular distribution
-
b
b
b
b
B hadron signature particles with high PT (few GeV) displaced vertex (~1cm from primary vertex)
Reconstruction of B decays is based on bull good mass resolutionbull excellent particle id to reject backgroundbull good proper time resolution to resolve B0
S oscillations
LHC radics=14 TeV σinelastic~80mb σ(bb)~05mbThe bb production is sharply peaked forward-backward
LHCb is a single arm detector 19lt|η|lt49
5
is ready to take data
VELO
Muon det Calorsquos RICH-2 MagnetOT+IT RICH-1
The LHCb detector
installation is complete
a beam-gas event 100908
6
ε(KK) 97ε(πK) 5
LHCb detector performanceDetailed Geant4 simulation
bull proper time resolution ~ 40 fs
bull effective mass resolution ~ 20 MeV
bull good Kπ separation up to ~60 GeV proper time resolution ~ 40 fs
BsDs(KKπ)K
Eff mass resolution ~ 20 MeV
7
LHCb operation at LHC
Bunch crossing frequency 40 MHz
Design LHC luminosity 1034 cm-2s-
1
Nominal LHCb luminosity 2∙1032 cm-2s-1
(appropriate focusing of the beam)
Expect ge2 fb-1 year
Inelastic pp interactions σ ~ 80 mb
8
LHCb trigger
L0 HLT and L0timesHLT efficiency
HLT rate
Event type Physics
200 Hz Exclusive B decay candidates
B (core programme)
600 Hz High mass dimuons J bJX (lifetime unbiased)
300 Hz D candidates Charm (mixing amp CPV)
900 Hz Inclusive b (eg b)
B (data mining)
L0 Trigger hardware 4 μsec latency
High ET (hgt35 GeV e γgt25 GeV μ μμgt1GeV)
Pileup VETO
Output rate ~1 MHz
High Level Trigger software two stages HLT1 and HLT2
HLT1 confirm L0 objects with T VELO optionally IP cuts hellipoutput ~ 30 kHz
HLT2 full reconstruction exclusive and inclusive candidates
Output 2 kHz storage event size ~35 kB
K+
Qvertex QJet
PV
e--
Bs0signal
D
KK
K-B0opposite
Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr
s ndash Vertex chargendash Jet charge
Same sidendash Fragmentation Kplusmn accompanying
Bs
ndash πplusmn from B rarr B() πplusmn
~95
35(K)
10
23
07
15
Bs
~ 51
07 (p)
10
21
04
11
Bd
Same side pK
Combined (Neural Net)
Jet Vertex Charge
Kaon oppside
Electron
Muon
Tag
Effective tagging efficiency
εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction
Flavour tagging
10
LHCb key measurements
CP-violation
φS
γ in trees
γ in loops
rare B decays
BS μμ
B K μμ
photon polarization in radiative penguin decays
charm physics
Mixing
CP violation
other
τ 3μ (analysis is ongoing)
11
2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV
~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1
Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV
L0 + HLT collect ~ 051 fb-1
B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1
collect total of ~10 fb-1
Full physics program Phase I
2013+ Upgrade proposed to run at 2 1033 cm-2s-1
Collect ~ 100 fb-1
Physics program
12
CP violation
13
Key measurement for 2009
φS is small in SM φS =-2βS =-2λ2η asymp -0036
sensitive probe for New Physics φS = φSSM + φS
NP
Measure from time dependent CP asymmetry in bccs
(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)
ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)
φS measurement
Tevatron resultsD0 s= 057 + 024
-030 with with 28 fb-1
CDFs = [032282] 68CL with 135 fb-1
14
φS measurement
The BSM effect in φS can be discovered or excluded with 20082009 LHCb data
Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even
Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics
15
angle γ
Measured values90 CL
Fit results90 CL
α 875 +311-102
907 + 168 - 54
β 215 +20-19 217 + 20 - 18
γ 768 +527-504
676 + 53 - 159
Least constrained by direct measurementsKey measurement of LHCb
Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics
16
3
2
1From tree amplitudes BS DSKTime dependent CP asymmetry
From tree amplitudes BplusmnDKplusmn B0DK
ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-
GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0
Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-
From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements
angle γ
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
2
LHCb A Large Hadron Collider experiment for PrecisionLHCb A Large Hadron Collider experiment for Precision Measurements of CP Violation and Rare Decays Measurements of CP Violation and Rare Decays
gt700 gt700 physicists physicists 50 institutes 15 50 institutes 15 countriescountries
ATLASATLAS
ALICEALICECMSCMS
3
LHCb experiment
Pythia
100μb
230μb
η of B-hadronP
T o
f B
-ha
dro
n
bb angular distribution
-
b
b
b
b
B hadron signature particles with high PT (few GeV) displaced vertex (~1cm from primary vertex)
Reconstruction of B decays is based on bull good mass resolutionbull excellent particle id to reject backgroundbull good proper time resolution to resolve B0
S oscillations
LHC radics=14 TeV σinelastic~80mb σ(bb)~05mbThe bb production is sharply peaked forward-backward
LHCb is a single arm detector 19lt|η|lt49
5
is ready to take data
VELO
Muon det Calorsquos RICH-2 MagnetOT+IT RICH-1
The LHCb detector
installation is complete
a beam-gas event 100908
6
ε(KK) 97ε(πK) 5
LHCb detector performanceDetailed Geant4 simulation
bull proper time resolution ~ 40 fs
bull effective mass resolution ~ 20 MeV
bull good Kπ separation up to ~60 GeV proper time resolution ~ 40 fs
BsDs(KKπ)K
Eff mass resolution ~ 20 MeV
7
LHCb operation at LHC
Bunch crossing frequency 40 MHz
Design LHC luminosity 1034 cm-2s-
1
Nominal LHCb luminosity 2∙1032 cm-2s-1
(appropriate focusing of the beam)
Expect ge2 fb-1 year
Inelastic pp interactions σ ~ 80 mb
8
LHCb trigger
L0 HLT and L0timesHLT efficiency
HLT rate
Event type Physics
200 Hz Exclusive B decay candidates
B (core programme)
600 Hz High mass dimuons J bJX (lifetime unbiased)
300 Hz D candidates Charm (mixing amp CPV)
900 Hz Inclusive b (eg b)
B (data mining)
L0 Trigger hardware 4 μsec latency
High ET (hgt35 GeV e γgt25 GeV μ μμgt1GeV)
Pileup VETO
Output rate ~1 MHz
High Level Trigger software two stages HLT1 and HLT2
HLT1 confirm L0 objects with T VELO optionally IP cuts hellipoutput ~ 30 kHz
HLT2 full reconstruction exclusive and inclusive candidates
Output 2 kHz storage event size ~35 kB
K+
Qvertex QJet
PV
e--
Bs0signal
D
KK
K-B0opposite
Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr
s ndash Vertex chargendash Jet charge
Same sidendash Fragmentation Kplusmn accompanying
Bs
ndash πplusmn from B rarr B() πplusmn
~95
35(K)
10
23
07
15
Bs
~ 51
07 (p)
10
21
04
11
Bd
Same side pK
Combined (Neural Net)
Jet Vertex Charge
Kaon oppside
Electron
Muon
Tag
Effective tagging efficiency
εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction
Flavour tagging
10
LHCb key measurements
CP-violation
φS
γ in trees
γ in loops
rare B decays
BS μμ
B K μμ
photon polarization in radiative penguin decays
charm physics
Mixing
CP violation
other
τ 3μ (analysis is ongoing)
11
2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV
~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1
Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV
L0 + HLT collect ~ 051 fb-1
B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1
collect total of ~10 fb-1
Full physics program Phase I
2013+ Upgrade proposed to run at 2 1033 cm-2s-1
Collect ~ 100 fb-1
Physics program
12
CP violation
13
Key measurement for 2009
φS is small in SM φS =-2βS =-2λ2η asymp -0036
sensitive probe for New Physics φS = φSSM + φS
NP
Measure from time dependent CP asymmetry in bccs
(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)
ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)
φS measurement
Tevatron resultsD0 s= 057 + 024
-030 with with 28 fb-1
CDFs = [032282] 68CL with 135 fb-1
14
φS measurement
The BSM effect in φS can be discovered or excluded with 20082009 LHCb data
Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even
Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics
15
angle γ
Measured values90 CL
Fit results90 CL
α 875 +311-102
907 + 168 - 54
β 215 +20-19 217 + 20 - 18
γ 768 +527-504
676 + 53 - 159
Least constrained by direct measurementsKey measurement of LHCb
Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics
16
3
2
1From tree amplitudes BS DSKTime dependent CP asymmetry
From tree amplitudes BplusmnDKplusmn B0DK
ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-
GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0
Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-
From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements
angle γ
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
3
LHCb experiment
Pythia
100μb
230μb
η of B-hadronP
T o
f B
-ha
dro
n
bb angular distribution
-
b
b
b
b
B hadron signature particles with high PT (few GeV) displaced vertex (~1cm from primary vertex)
Reconstruction of B decays is based on bull good mass resolutionbull excellent particle id to reject backgroundbull good proper time resolution to resolve B0
S oscillations
LHC radics=14 TeV σinelastic~80mb σ(bb)~05mbThe bb production is sharply peaked forward-backward
LHCb is a single arm detector 19lt|η|lt49
5
is ready to take data
VELO
Muon det Calorsquos RICH-2 MagnetOT+IT RICH-1
The LHCb detector
installation is complete
a beam-gas event 100908
6
ε(KK) 97ε(πK) 5
LHCb detector performanceDetailed Geant4 simulation
bull proper time resolution ~ 40 fs
bull effective mass resolution ~ 20 MeV
bull good Kπ separation up to ~60 GeV proper time resolution ~ 40 fs
BsDs(KKπ)K
Eff mass resolution ~ 20 MeV
7
LHCb operation at LHC
Bunch crossing frequency 40 MHz
Design LHC luminosity 1034 cm-2s-
1
Nominal LHCb luminosity 2∙1032 cm-2s-1
(appropriate focusing of the beam)
Expect ge2 fb-1 year
Inelastic pp interactions σ ~ 80 mb
8
LHCb trigger
L0 HLT and L0timesHLT efficiency
HLT rate
Event type Physics
200 Hz Exclusive B decay candidates
B (core programme)
600 Hz High mass dimuons J bJX (lifetime unbiased)
300 Hz D candidates Charm (mixing amp CPV)
900 Hz Inclusive b (eg b)
B (data mining)
L0 Trigger hardware 4 μsec latency
High ET (hgt35 GeV e γgt25 GeV μ μμgt1GeV)
Pileup VETO
Output rate ~1 MHz
High Level Trigger software two stages HLT1 and HLT2
HLT1 confirm L0 objects with T VELO optionally IP cuts hellipoutput ~ 30 kHz
HLT2 full reconstruction exclusive and inclusive candidates
Output 2 kHz storage event size ~35 kB
K+
Qvertex QJet
PV
e--
Bs0signal
D
KK
K-B0opposite
Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr
s ndash Vertex chargendash Jet charge
Same sidendash Fragmentation Kplusmn accompanying
Bs
ndash πplusmn from B rarr B() πplusmn
~95
35(K)
10
23
07
15
Bs
~ 51
07 (p)
10
21
04
11
Bd
Same side pK
Combined (Neural Net)
Jet Vertex Charge
Kaon oppside
Electron
Muon
Tag
Effective tagging efficiency
εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction
Flavour tagging
10
LHCb key measurements
CP-violation
φS
γ in trees
γ in loops
rare B decays
BS μμ
B K μμ
photon polarization in radiative penguin decays
charm physics
Mixing
CP violation
other
τ 3μ (analysis is ongoing)
11
2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV
~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1
Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV
L0 + HLT collect ~ 051 fb-1
B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1
collect total of ~10 fb-1
Full physics program Phase I
2013+ Upgrade proposed to run at 2 1033 cm-2s-1
Collect ~ 100 fb-1
Physics program
12
CP violation
13
Key measurement for 2009
φS is small in SM φS =-2βS =-2λ2η asymp -0036
sensitive probe for New Physics φS = φSSM + φS
NP
Measure from time dependent CP asymmetry in bccs
(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)
ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)
φS measurement
Tevatron resultsD0 s= 057 + 024
-030 with with 28 fb-1
CDFs = [032282] 68CL with 135 fb-1
14
φS measurement
The BSM effect in φS can be discovered or excluded with 20082009 LHCb data
Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even
Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics
15
angle γ
Measured values90 CL
Fit results90 CL
α 875 +311-102
907 + 168 - 54
β 215 +20-19 217 + 20 - 18
γ 768 +527-504
676 + 53 - 159
Least constrained by direct measurementsKey measurement of LHCb
Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics
16
3
2
1From tree amplitudes BS DSKTime dependent CP asymmetry
From tree amplitudes BplusmnDKplusmn B0DK
ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-
GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0
Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-
From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements
angle γ
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
5
is ready to take data
VELO
Muon det Calorsquos RICH-2 MagnetOT+IT RICH-1
The LHCb detector
installation is complete
a beam-gas event 100908
6
ε(KK) 97ε(πK) 5
LHCb detector performanceDetailed Geant4 simulation
bull proper time resolution ~ 40 fs
bull effective mass resolution ~ 20 MeV
bull good Kπ separation up to ~60 GeV proper time resolution ~ 40 fs
BsDs(KKπ)K
Eff mass resolution ~ 20 MeV
7
LHCb operation at LHC
Bunch crossing frequency 40 MHz
Design LHC luminosity 1034 cm-2s-
1
Nominal LHCb luminosity 2∙1032 cm-2s-1
(appropriate focusing of the beam)
Expect ge2 fb-1 year
Inelastic pp interactions σ ~ 80 mb
8
LHCb trigger
L0 HLT and L0timesHLT efficiency
HLT rate
Event type Physics
200 Hz Exclusive B decay candidates
B (core programme)
600 Hz High mass dimuons J bJX (lifetime unbiased)
300 Hz D candidates Charm (mixing amp CPV)
900 Hz Inclusive b (eg b)
B (data mining)
L0 Trigger hardware 4 μsec latency
High ET (hgt35 GeV e γgt25 GeV μ μμgt1GeV)
Pileup VETO
Output rate ~1 MHz
High Level Trigger software two stages HLT1 and HLT2
HLT1 confirm L0 objects with T VELO optionally IP cuts hellipoutput ~ 30 kHz
HLT2 full reconstruction exclusive and inclusive candidates
Output 2 kHz storage event size ~35 kB
K+
Qvertex QJet
PV
e--
Bs0signal
D
KK
K-B0opposite
Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr
s ndash Vertex chargendash Jet charge
Same sidendash Fragmentation Kplusmn accompanying
Bs
ndash πplusmn from B rarr B() πplusmn
~95
35(K)
10
23
07
15
Bs
~ 51
07 (p)
10
21
04
11
Bd
Same side pK
Combined (Neural Net)
Jet Vertex Charge
Kaon oppside
Electron
Muon
Tag
Effective tagging efficiency
εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction
Flavour tagging
10
LHCb key measurements
CP-violation
φS
γ in trees
γ in loops
rare B decays
BS μμ
B K μμ
photon polarization in radiative penguin decays
charm physics
Mixing
CP violation
other
τ 3μ (analysis is ongoing)
11
2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV
~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1
Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV
L0 + HLT collect ~ 051 fb-1
B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1
collect total of ~10 fb-1
Full physics program Phase I
2013+ Upgrade proposed to run at 2 1033 cm-2s-1
Collect ~ 100 fb-1
Physics program
12
CP violation
13
Key measurement for 2009
φS is small in SM φS =-2βS =-2λ2η asymp -0036
sensitive probe for New Physics φS = φSSM + φS
NP
Measure from time dependent CP asymmetry in bccs
(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)
ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)
φS measurement
Tevatron resultsD0 s= 057 + 024
-030 with with 28 fb-1
CDFs = [032282] 68CL with 135 fb-1
14
φS measurement
The BSM effect in φS can be discovered or excluded with 20082009 LHCb data
Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even
Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics
15
angle γ
Measured values90 CL
Fit results90 CL
α 875 +311-102
907 + 168 - 54
β 215 +20-19 217 + 20 - 18
γ 768 +527-504
676 + 53 - 159
Least constrained by direct measurementsKey measurement of LHCb
Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics
16
3
2
1From tree amplitudes BS DSKTime dependent CP asymmetry
From tree amplitudes BplusmnDKplusmn B0DK
ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-
GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0
Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-
From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements
angle γ
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
6
ε(KK) 97ε(πK) 5
LHCb detector performanceDetailed Geant4 simulation
bull proper time resolution ~ 40 fs
bull effective mass resolution ~ 20 MeV
bull good Kπ separation up to ~60 GeV proper time resolution ~ 40 fs
BsDs(KKπ)K
Eff mass resolution ~ 20 MeV
7
LHCb operation at LHC
Bunch crossing frequency 40 MHz
Design LHC luminosity 1034 cm-2s-
1
Nominal LHCb luminosity 2∙1032 cm-2s-1
(appropriate focusing of the beam)
Expect ge2 fb-1 year
Inelastic pp interactions σ ~ 80 mb
8
LHCb trigger
L0 HLT and L0timesHLT efficiency
HLT rate
Event type Physics
200 Hz Exclusive B decay candidates
B (core programme)
600 Hz High mass dimuons J bJX (lifetime unbiased)
300 Hz D candidates Charm (mixing amp CPV)
900 Hz Inclusive b (eg b)
B (data mining)
L0 Trigger hardware 4 μsec latency
High ET (hgt35 GeV e γgt25 GeV μ μμgt1GeV)
Pileup VETO
Output rate ~1 MHz
High Level Trigger software two stages HLT1 and HLT2
HLT1 confirm L0 objects with T VELO optionally IP cuts hellipoutput ~ 30 kHz
HLT2 full reconstruction exclusive and inclusive candidates
Output 2 kHz storage event size ~35 kB
K+
Qvertex QJet
PV
e--
Bs0signal
D
KK
K-B0opposite
Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr
s ndash Vertex chargendash Jet charge
Same sidendash Fragmentation Kplusmn accompanying
Bs
ndash πplusmn from B rarr B() πplusmn
~95
35(K)
10
23
07
15
Bs
~ 51
07 (p)
10
21
04
11
Bd
Same side pK
Combined (Neural Net)
Jet Vertex Charge
Kaon oppside
Electron
Muon
Tag
Effective tagging efficiency
εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction
Flavour tagging
10
LHCb key measurements
CP-violation
φS
γ in trees
γ in loops
rare B decays
BS μμ
B K μμ
photon polarization in radiative penguin decays
charm physics
Mixing
CP violation
other
τ 3μ (analysis is ongoing)
11
2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV
~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1
Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV
L0 + HLT collect ~ 051 fb-1
B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1
collect total of ~10 fb-1
Full physics program Phase I
2013+ Upgrade proposed to run at 2 1033 cm-2s-1
Collect ~ 100 fb-1
Physics program
12
CP violation
13
Key measurement for 2009
φS is small in SM φS =-2βS =-2λ2η asymp -0036
sensitive probe for New Physics φS = φSSM + φS
NP
Measure from time dependent CP asymmetry in bccs
(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)
ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)
φS measurement
Tevatron resultsD0 s= 057 + 024
-030 with with 28 fb-1
CDFs = [032282] 68CL with 135 fb-1
14
φS measurement
The BSM effect in φS can be discovered or excluded with 20082009 LHCb data
Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even
Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics
15
angle γ
Measured values90 CL
Fit results90 CL
α 875 +311-102
907 + 168 - 54
β 215 +20-19 217 + 20 - 18
γ 768 +527-504
676 + 53 - 159
Least constrained by direct measurementsKey measurement of LHCb
Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics
16
3
2
1From tree amplitudes BS DSKTime dependent CP asymmetry
From tree amplitudes BplusmnDKplusmn B0DK
ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-
GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0
Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-
From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements
angle γ
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
7
LHCb operation at LHC
Bunch crossing frequency 40 MHz
Design LHC luminosity 1034 cm-2s-
1
Nominal LHCb luminosity 2∙1032 cm-2s-1
(appropriate focusing of the beam)
Expect ge2 fb-1 year
Inelastic pp interactions σ ~ 80 mb
8
LHCb trigger
L0 HLT and L0timesHLT efficiency
HLT rate
Event type Physics
200 Hz Exclusive B decay candidates
B (core programme)
600 Hz High mass dimuons J bJX (lifetime unbiased)
300 Hz D candidates Charm (mixing amp CPV)
900 Hz Inclusive b (eg b)
B (data mining)
L0 Trigger hardware 4 μsec latency
High ET (hgt35 GeV e γgt25 GeV μ μμgt1GeV)
Pileup VETO
Output rate ~1 MHz
High Level Trigger software two stages HLT1 and HLT2
HLT1 confirm L0 objects with T VELO optionally IP cuts hellipoutput ~ 30 kHz
HLT2 full reconstruction exclusive and inclusive candidates
Output 2 kHz storage event size ~35 kB
K+
Qvertex QJet
PV
e--
Bs0signal
D
KK
K-B0opposite
Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr
s ndash Vertex chargendash Jet charge
Same sidendash Fragmentation Kplusmn accompanying
Bs
ndash πplusmn from B rarr B() πplusmn
~95
35(K)
10
23
07
15
Bs
~ 51
07 (p)
10
21
04
11
Bd
Same side pK
Combined (Neural Net)
Jet Vertex Charge
Kaon oppside
Electron
Muon
Tag
Effective tagging efficiency
εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction
Flavour tagging
10
LHCb key measurements
CP-violation
φS
γ in trees
γ in loops
rare B decays
BS μμ
B K μμ
photon polarization in radiative penguin decays
charm physics
Mixing
CP violation
other
τ 3μ (analysis is ongoing)
11
2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV
~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1
Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV
L0 + HLT collect ~ 051 fb-1
B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1
collect total of ~10 fb-1
Full physics program Phase I
2013+ Upgrade proposed to run at 2 1033 cm-2s-1
Collect ~ 100 fb-1
Physics program
12
CP violation
13
Key measurement for 2009
φS is small in SM φS =-2βS =-2λ2η asymp -0036
sensitive probe for New Physics φS = φSSM + φS
NP
Measure from time dependent CP asymmetry in bccs
(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)
ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)
φS measurement
Tevatron resultsD0 s= 057 + 024
-030 with with 28 fb-1
CDFs = [032282] 68CL with 135 fb-1
14
φS measurement
The BSM effect in φS can be discovered or excluded with 20082009 LHCb data
Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even
Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics
15
angle γ
Measured values90 CL
Fit results90 CL
α 875 +311-102
907 + 168 - 54
β 215 +20-19 217 + 20 - 18
γ 768 +527-504
676 + 53 - 159
Least constrained by direct measurementsKey measurement of LHCb
Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics
16
3
2
1From tree amplitudes BS DSKTime dependent CP asymmetry
From tree amplitudes BplusmnDKplusmn B0DK
ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-
GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0
Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-
From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements
angle γ
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
8
LHCb trigger
L0 HLT and L0timesHLT efficiency
HLT rate
Event type Physics
200 Hz Exclusive B decay candidates
B (core programme)
600 Hz High mass dimuons J bJX (lifetime unbiased)
300 Hz D candidates Charm (mixing amp CPV)
900 Hz Inclusive b (eg b)
B (data mining)
L0 Trigger hardware 4 μsec latency
High ET (hgt35 GeV e γgt25 GeV μ μμgt1GeV)
Pileup VETO
Output rate ~1 MHz
High Level Trigger software two stages HLT1 and HLT2
HLT1 confirm L0 objects with T VELO optionally IP cuts hellipoutput ~ 30 kHz
HLT2 full reconstruction exclusive and inclusive candidates
Output 2 kHz storage event size ~35 kB
K+
Qvertex QJet
PV
e--
Bs0signal
D
KK
K-B0opposite
Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr
s ndash Vertex chargendash Jet charge
Same sidendash Fragmentation Kplusmn accompanying
Bs
ndash πplusmn from B rarr B() πplusmn
~95
35(K)
10
23
07
15
Bs
~ 51
07 (p)
10
21
04
11
Bd
Same side pK
Combined (Neural Net)
Jet Vertex Charge
Kaon oppside
Electron
Muon
Tag
Effective tagging efficiency
εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction
Flavour tagging
10
LHCb key measurements
CP-violation
φS
γ in trees
γ in loops
rare B decays
BS μμ
B K μμ
photon polarization in radiative penguin decays
charm physics
Mixing
CP violation
other
τ 3μ (analysis is ongoing)
11
2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV
~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1
Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV
L0 + HLT collect ~ 051 fb-1
B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1
collect total of ~10 fb-1
Full physics program Phase I
2013+ Upgrade proposed to run at 2 1033 cm-2s-1
Collect ~ 100 fb-1
Physics program
12
CP violation
13
Key measurement for 2009
φS is small in SM φS =-2βS =-2λ2η asymp -0036
sensitive probe for New Physics φS = φSSM + φS
NP
Measure from time dependent CP asymmetry in bccs
(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)
ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)
φS measurement
Tevatron resultsD0 s= 057 + 024
-030 with with 28 fb-1
CDFs = [032282] 68CL with 135 fb-1
14
φS measurement
The BSM effect in φS can be discovered or excluded with 20082009 LHCb data
Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even
Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics
15
angle γ
Measured values90 CL
Fit results90 CL
α 875 +311-102
907 + 168 - 54
β 215 +20-19 217 + 20 - 18
γ 768 +527-504
676 + 53 - 159
Least constrained by direct measurementsKey measurement of LHCb
Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics
16
3
2
1From tree amplitudes BS DSKTime dependent CP asymmetry
From tree amplitudes BplusmnDKplusmn B0DK
ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-
GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0
Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-
From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements
angle γ
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
K+
Qvertex QJet
PV
e--
Bs0signal
D
KK
K-B0opposite
Opposite sidendash High Pt leptonsndash Kplusmn from b rarr c rarr
s ndash Vertex chargendash Jet charge
Same sidendash Fragmentation Kplusmn accompanying
Bs
ndash πplusmn from B rarr B() πplusmn
~95
35(K)
10
23
07
15
Bs
~ 51
07 (p)
10
21
04
11
Bd
Same side pK
Combined (Neural Net)
Jet Vertex Charge
Kaon oppside
Electron
Muon
Tag
Effective tagging efficiency
εD2= ε(1-2ω)2 ε tagging efficiency ω wrong tag fraction
Flavour tagging
10
LHCb key measurements
CP-violation
φS
γ in trees
γ in loops
rare B decays
BS μμ
B K μμ
photon polarization in radiative penguin decays
charm physics
Mixing
CP violation
other
τ 3μ (analysis is ongoing)
11
2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV
~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1
Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV
L0 + HLT collect ~ 051 fb-1
B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1
collect total of ~10 fb-1
Full physics program Phase I
2013+ Upgrade proposed to run at 2 1033 cm-2s-1
Collect ~ 100 fb-1
Physics program
12
CP violation
13
Key measurement for 2009
φS is small in SM φS =-2βS =-2λ2η asymp -0036
sensitive probe for New Physics φS = φSSM + φS
NP
Measure from time dependent CP asymmetry in bccs
(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)
ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)
φS measurement
Tevatron resultsD0 s= 057 + 024
-030 with with 28 fb-1
CDFs = [032282] 68CL with 135 fb-1
14
φS measurement
The BSM effect in φS can be discovered or excluded with 20082009 LHCb data
Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even
Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics
15
angle γ
Measured values90 CL
Fit results90 CL
α 875 +311-102
907 + 168 - 54
β 215 +20-19 217 + 20 - 18
γ 768 +527-504
676 + 53 - 159
Least constrained by direct measurementsKey measurement of LHCb
Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics
16
3
2
1From tree amplitudes BS DSKTime dependent CP asymmetry
From tree amplitudes BplusmnDKplusmn B0DK
ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-
GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0
Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-
From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements
angle γ
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
10
LHCb key measurements
CP-violation
φS
γ in trees
γ in loops
rare B decays
BS μμ
B K μμ
photon polarization in radiative penguin decays
charm physics
Mixing
CP violation
other
τ 3μ (analysis is ongoing)
11
2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV
~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1
Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV
L0 + HLT collect ~ 051 fb-1
B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1
collect total of ~10 fb-1
Full physics program Phase I
2013+ Upgrade proposed to run at 2 1033 cm-2s-1
Collect ~ 100 fb-1
Physics program
12
CP violation
13
Key measurement for 2009
φS is small in SM φS =-2βS =-2λ2η asymp -0036
sensitive probe for New Physics φS = φSSM + φS
NP
Measure from time dependent CP asymmetry in bccs
(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)
ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)
φS measurement
Tevatron resultsD0 s= 057 + 024
-030 with with 28 fb-1
CDFs = [032282] 68CL with 135 fb-1
14
φS measurement
The BSM effect in φS can be discovered or excluded with 20082009 LHCb data
Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even
Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics
15
angle γ
Measured values90 CL
Fit results90 CL
α 875 +311-102
907 + 168 - 54
β 215 +20-19 217 + 20 - 18
γ 768 +527-504
676 + 53 - 159
Least constrained by direct measurementsKey measurement of LHCb
Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics
16
3
2
1From tree amplitudes BS DSKTime dependent CP asymmetry
From tree amplitudes BplusmnDKplusmn B0DK
ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-
GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0
Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-
From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements
angle γ
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
11
2008 (beginning of 2009) Lumi ~1031 cm-2s-1 10 TeV
~108 sample of minimum bias L0+proto-HLT trigger collect ~ 5 pb-1
Calibration alignment minimum bias physics charmonium production2009 Lumi 2 1032 cm-2s-1 14 TeV
L0 + HLT collect ~ 051 fb-1
B Physics calibration CP (sin2β Δms ) key measurements (βs Bsμμ hellip)2010-2013 Luminosity 2-5 1032 cm-2s-1
collect total of ~10 fb-1
Full physics program Phase I
2013+ Upgrade proposed to run at 2 1033 cm-2s-1
Collect ~ 100 fb-1
Physics program
12
CP violation
13
Key measurement for 2009
φS is small in SM φS =-2βS =-2λ2η asymp -0036
sensitive probe for New Physics φS = φSSM + φS
NP
Measure from time dependent CP asymmetry in bccs
(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)
ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)
φS measurement
Tevatron resultsD0 s= 057 + 024
-030 with with 28 fb-1
CDFs = [032282] 68CL with 135 fb-1
14
φS measurement
The BSM effect in φS can be discovered or excluded with 20082009 LHCb data
Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even
Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics
15
angle γ
Measured values90 CL
Fit results90 CL
α 875 +311-102
907 + 168 - 54
β 215 +20-19 217 + 20 - 18
γ 768 +527-504
676 + 53 - 159
Least constrained by direct measurementsKey measurement of LHCb
Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics
16
3
2
1From tree amplitudes BS DSKTime dependent CP asymmetry
From tree amplitudes BplusmnDKplusmn B0DK
ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-
GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0
Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-
From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements
angle γ
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
12
CP violation
13
Key measurement for 2009
φS is small in SM φS =-2βS =-2λ2η asymp -0036
sensitive probe for New Physics φS = φSSM + φS
NP
Measure from time dependent CP asymmetry in bccs
(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)
ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)
φS measurement
Tevatron resultsD0 s= 057 + 024
-030 with with 28 fb-1
CDFs = [032282] 68CL with 135 fb-1
14
φS measurement
The BSM effect in φS can be discovered or excluded with 20082009 LHCb data
Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even
Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics
15
angle γ
Measured values90 CL
Fit results90 CL
α 875 +311-102
907 + 168 - 54
β 215 +20-19 217 + 20 - 18
γ 768 +527-504
676 + 53 - 159
Least constrained by direct measurementsKey measurement of LHCb
Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics
16
3
2
1From tree amplitudes BS DSKTime dependent CP asymmetry
From tree amplitudes BplusmnDKplusmn B0DK
ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-
GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0
Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-
From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements
angle γ
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
13
Key measurement for 2009
φS is small in SM φS =-2βS =-2λ2η asymp -0036
sensitive probe for New Physics φS = φSSM + φS
NP
Measure from time dependent CP asymmetry in bccs
(BS Jψ φ BS Jψ η(ηrsquo) BS ηCφ BS DSDS hellip)
ldquogolden moderdquo BS Jψ φ high BR (~130k per 2 fb-1)
φS measurement
Tevatron resultsD0 s= 057 + 024
-030 with with 28 fb-1
CDFs = [032282] 68CL with 135 fb-1
14
φS measurement
The BSM effect in φS can be discovered or excluded with 20082009 LHCb data
Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even
Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics
15
angle γ
Measured values90 CL
Fit results90 CL
α 875 +311-102
907 + 168 - 54
β 215 +20-19 217 + 20 - 18
γ 768 +527-504
676 + 53 - 159
Least constrained by direct measurementsKey measurement of LHCb
Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics
16
3
2
1From tree amplitudes BS DSKTime dependent CP asymmetry
From tree amplitudes BplusmnDKplusmn B0DK
ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-
GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0
Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-
From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements
angle γ
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
14
φS measurement
The BSM effect in φS can be discovered or excluded with 20082009 LHCb data
Jψ φ is not a pure CP eigenstate angular analysis is necessary to separate CP-odd and CP-even
Other bccs processes (Jψ η ηCφ DSDS) can be added angular analysis not needed but smaller statistics
15
angle γ
Measured values90 CL
Fit results90 CL
α 875 +311-102
907 + 168 - 54
β 215 +20-19 217 + 20 - 18
γ 768 +527-504
676 + 53 - 159
Least constrained by direct measurementsKey measurement of LHCb
Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics
16
3
2
1From tree amplitudes BS DSKTime dependent CP asymmetry
From tree amplitudes BplusmnDKplusmn B0DK
ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-
GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0
Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-
From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements
angle γ
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
15
angle γ
Measured values90 CL
Fit results90 CL
α 875 +311-102
907 + 168 - 54
β 215 +20-19 217 + 20 - 18
γ 768 +527-504
676 + 53 - 159
Least constrained by direct measurementsKey measurement of LHCb
Comparison of γ measurement in trees with fitted values as well as with measurement in loops is a sensitive probe of New Physics
16
3
2
1From tree amplitudes BS DSKTime dependent CP asymmetry
From tree amplitudes BplusmnDKplusmn B0DK
ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-
GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0
Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-
From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements
angle γ
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
16
3
2
1From tree amplitudes BS DSKTime dependent CP asymmetry
From tree amplitudes BplusmnDKplusmn B0DK
ADS Use doubly Cabibbo-suppressed D0 decays eg D0 K+π-
GLW Use CP eigenstates of D()0 decay eg D0 K+K- π+πndash Ksπ0
Dalitz Use Dalitz plot analysis of 3-body D0 decays eg Ks π+ π-
From penguins B h hSensitive to New Physics compare ldquoeffectiverdquo γ with tree measurements
angle γ
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
17
s
s
b
c
u
s
Bs0
Ds
K
Kndash
s
s
b
u
c
s
Bs0
Ds
bull interference between tree level decays via mixingbull insensitive to New Physics
bull Measures + 2s (s from Bs J)
bull Main background Bs Ds
bull 10 times higher branching ratio bull suppressed using PID by RICH
Channel Yield 2 fb-1 BS (90 CL)
BSDSK 62 k [008-04]
BSDS 140 k [008-03]
sif eie2
sif e
KDs
KDs)(0 tBs
)(0 tBs
)0(0sB
γ from BSDSK
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
18
5 years dataBsrarr Ds
-
Bsrarr Ds-K+
ms = 20)
BsDsK Bs Ds have same topology Combine samples to fit Δms ΔΓs and mistag rate together with CP phase γ+φs
Sensitivity at 2 fb-1
s(γ+φs) = 9ondash12o
s(ms) = 0007 ps-1
γ from BSDSK
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
19
ADS method Measure relative rates of Brarr D(Kπ) K and Brarr D(Kπ) K
Two interfering tree B-diagrams one colour-suppressed (rB ~0077) D0 anti-D0 reconstructed in same final stateTwo interfering tree D-diagrams one Double Cabibbo-suppressed (rD
Kπ~006)
Colour allowed
Double Cabbibo suppressed
Colour suppressed
Cabbibo favoured
Reversed suppression of the D decays relative to the B decays results in more equal amplitudes large interference effects
γ from BDK
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
20
favoured
colour suppressed
Channel Yield (2 fb-
1)BS
B rarr D(hh) K 78 k 18
B rarr D(K) K Favoured 56 k 06
B rarr D(K) K Suppressed 071k 2
B rarr D(K3) K Favoured 62k 07
B rarr D(K3) K Suppressed 08k 2
() = 5o to 13o
depending on strong phases
Also under studyBplusmn rarr DKplusmn with D rarr Ks
Bplusmn rarr DKplusmn with D rarr KK
B0 rarr DK0 with D rarr KK K
Bplusmn rarr DKplusmn with D rarr KK K(high background)
Overall expect precision of() = 5o with 2 fb-1 of data
Dalitz analyses
()
γ from BDK
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
24
Rare B decays
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
25
BSμμ
Strongly suppressed in SM by helicity Br= (335 plusmn 032) x 10-9
Sensitive to NP models with S or P coupling
MSSM Br ~ tan6βMA4
bull Current limits from Tevatronbull CDF BR lt 47 10-8 90 CLbull D0 BR lt 75 10-8 90 CLLHCb sensitivity
(SM branching ratio) bull 01 fb-1 BR lt 10-8
bull 05 fb-1 BR lt SM expectationbull 2 fbndash1 3 evidencebull 10 fbndash1 5 observation
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
26
Bsφγ
b (L) + (msmb) (R)
In SM photon from bsγ is left-handed from bsγ right-handed φγ final states in B and B do not interfere CP asymmetry in mixing cannot occur
Measuring time-dependent CP asymmetry is a probe for NP
2sinh
2cosh
sincos
)()(
)()()(
tA
tmtAmtA
BB
BBtA mixdir
SS
SSCP
In SMAdir 0 Amix sin 2ψ sin 2β AΔ sin 2ψ cos 2βtan ψ = |brarrsγR| | brarrsγL|cos 2β 1
Channel Yield (2 fb-1)
BS
Bsrarr 11k lt055
Statistical precision after 1 year (2 fb-1)(Adir ) = 011 (Amix ) = 011(requires tagging) (A) = 022 (no tagging required)
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
27
BdKμμ
bull 2009 05 fb-1 expect 2000 eventsbull B factories total ~ 1000 events by now
Channel Yield (2 fb-1) BG (2 fb-1)
BsrarrK+ ndash 7200+-2200 (BR)
1770+-310
Zero crossing point of forward-backward asymmetry AFB in θl angle as a function of mμμ precisely computed in SM s0
SM(C7C9)=439(+038-035) GeV2
sensitive to NP contribution
s = (m)2 [GeV2]
2 fb-1
A fb(s
) s0
(s0) = 05 GeV2
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
28
Charm amp tau
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
29
2 charged tracks from a detached vertex with -700lt(mππ-mD0)lt 50
MeV + another charged track matching the hypothesis of DD0π decay (vertex Δm)
D0s are flavor tagged with π from D decay
Two sources of D0s in LHCb from B decays
favoured by LHCb triggers prompt production in primary interaction
Estimated annual yields (per 2 fb-1) from B decays
D0K-π+ (right sign) 124 MD0K+π- (wrong sign) 465 kD0K+K- 16 MD0π+π- 05 MSimilar amounts expected from prompt
production
Dedicated D trigger
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
30
LHCb prospects for Charm physics studies
D0 mixing
Time-dependent D0 mixing with wrong-sign D0K+π- decays
Strong phase δ between DCS and CF amplitudes (xy)(xrsquoyrsquo)
Lifetime ratio mean lifetime (DK-
π+) and CP even decay DK+K-(π+π-)
yCP=y in absence of CP violation (φ=0)
2
2121 yMM
x
The mixing has been recently observed (Belle BaBar CDF)
x = 089plusmn 026027
y = 075plusmn 017018
LHCb sensitivities with 10 fb-1 σstat(xrsquo2) ~ 6410-5 σstat(yrsquo) ~ 8710-4σstat(yCP)~ 4910-4
2
1sincos1
)(
)( 2
_0
0m
CP
Rxy
KKD
KDy
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
31
LHCb prospects for Charm physics studies
Direct CP violation can be measured in D0KK lifetime asymmetry
ACPlt10-3 in SM up to 1 with New Physics
current HFAG average Belle BaBar CDF) ACP = -016 plusmn 023
LHCb sensitivity with 10 fb-1 σstat(ACP) ~ 4810-4
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
32
Present upper limit
Br(τ3μ) lt 3210-8 90CL (Belle)
Br(τ3μ) lt 5310-8 90CL (BaBar)
σ=86 MeV
τ3μ background
Preliminary analysis shows that at 2fb-1 LHCb can obtain upper limit of ~610-8
The result is not final background estimate may change event selection refined
τ3μ (preliminary)
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
33
Upgrade issues
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
34
Sensitivities for 100 fb-1
Also studying Lepton Flavour Violation in
10 fb-1 will be collected by 2013
bull φS measured to 0023
bull γ to 2 - 5o
bull BS μμ observed at 5σ level
bull many more excellent physics results
next step ndash collect 100fb-
1
Probemeasure NP at level
bull have to work at gt 1033cm-2s-
1
bull upgrade is necessary
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
35
bull The L0 hadron trigger saturates the bandwidth (1 MHz) at 21032 cm-2s-1
bull typical L0 efficiency for purely hadronic final states ~ 50 will drop with luminosity
bull apart from the trigger the LHCb performance does not deteriorate significantly up to 1033 cm-2s-1
bull A 40 MHz readout of all the detectors is the only way to achieve 1033 Introduce first level trigger on detached vertex on a CPU farm
LHC schedule
bull Phase 1 IR upgrade Install new triplets β=025m in IP1 and 5 Requires 8 month shutdown in 2012-2013
bull Phase 2 inner detectors of ATLAS and CMS need to be replaced 18 month shutdown in ~2017
LHCb at higher luminosity
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
36
the main effort is to upgrade by 2014 all Frontend Electronics to 40 MHz readout
bull perform also necessary upgrade of subdetectors
bull replace readout chips in the vertex detector (VELO)
bull RICHs the readout chips are encapsulated inside photodetectors replace all photodetectors
bull Tracking system replace all Si sensors as readout chips are bonded on hybrids
bull run from 2014 at 1033 cm-2s-1 until the Phase 2 shutdown Reach 20 fb-1
in 2017 upgrade the subdetectors for gt21033 cm-2s-1
bull fully rebuild vertex detector (pixels or 3D)
bull rebuild Outer Tracker replace central part of EM calorimeter hellip
bull run at highest possible luminosity for 5 years
LHCb upgrade strategy
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
37
Conclusionsbull The LHCb detector at LHC is commissioned and ready to take data
bull key measurements with 2009 data
bull βS precision ~004
bull BSμμ sensitivity ~ SM expectations
bull Full physics program in 2010-2013 at 10 fb-1
bull Angle γ precision of ~5o with 2 fb-1
bull search for New Physics in photon polarization in bsγ
bull precision measurement of AFB in BKμμ
bull Charm physics D0 mixing direct CP violation in D0KK(ππ)
bull and much morehellip
bull 2013+ upgrade of the detector aiming to reach 100 fb-1 at operating luminosity of 1033cm-2s-1 (and gt21033 cm-2s-1 in 2017+)
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
38
Backup
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23
39
τ3μ Event selection
cuts per track
PT gt 04 GeV
IP()IP gt 30 dLL gt -3cuts per 3 vertex 2 lt 9 |V3-Vprim| gt 3 Z3-Zprim gt 0 cm IP()IP lt 3
Background rejection 4910-9
Per 2 fb-1 ~2200 bg evts expected
FeldmanCousins upper limit 785 ev
Corresponds to Br limit 61 10-8
Main source of τ DS decays
Per 2 fb-1 561010 τ produced
Signal efficiency 23