Upload
others
View
4
Download
0
Embed Size (px)
Citation preview
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 1
Overview
bull R-parity violating Supersymmetrybull Cross section and Run I Limitbull Data Selection amp Efficienciesbull Control plotsbull Distribution after final cutsbull Results
Search for RPV Susy through the LQD coupling λrsquo211
Christian AutermannIII Physikalisches Institut A
RWTH Aachen
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 2
R-parity Violating Supersymmetry
baiabi
czk
cyj
cxixyzijk
ck
bj
aiabijk
ck
bj
aiabijkR
RMSSM
HLDDUDQLELLW
WWW
P
P
2
2
1 εκελελελ +++=
+=
SLBPR 23)1( parity-R ++minus=
ReferencesH Dreiner etal Search for R-Parity Violation at Run-II of the Tevatron hep-ph9906224 NGhodbane SKatsanevas PMorawitz EPerez SUSYGEN 3 hep-ph9909499
ijk = 123 generation indices
Chiral superfieldsL lepton doublet superfieldQ quark doublet superfieldD down-like quark singlet superfield
λ λ` λ`` Yukawa couplings
Resonant production
Assuming a non-zero λ`211 coupling leads to muon (2nd gen) and two jets (1st gen) final states
tri-lepton channelAnne-Marie Daniela
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 3
Neutralino Production amp Decay
production decay
Final statetwo (isolated) muonstwo jets
Other modesbull sneutrino resonance rarr 2 jets MET amp perh 1 microbull neutralino pair production and decay over λ`211
bull t-channel slepton exchange
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 4
Run I Exclusion Contour
DOslash Collaboration PhysRevLetter 89 (2002) hep-ex0111053
( )
1
02βtan
0A0
minus=
==
micromicro
mSUGRA parametersm0 universal soft breaking mass
parameter for scalars m12 universal soft braking mass
parameter for gauginosA0 trilinear coupling term sign(micro) higgs mass mixing parametertan(β) ratio of the vacuum expectation
of the neutral higgs fields
m0 m12 and A0 are defined at the GUT scale
DOslash Run I
Plots for this point
Limits forMχ = 75 100 GeV ampMmicro = 200 300 GeV
~
~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 5
Data Sample amp Preselection
bull Total delivered L=209pb- 1 good amp reconstructed L=154pb- 1
bull Data taking period April 2002 ndash September 2003bull Di-muon data sample ~4 of all data
bull Re-skim (6 of di-muon sample 297k events) 2 muons with ptgt5 GeV and ptgt3 GeV and a good central track match Anti cosmic cuts |t_A|lt10ns -15nslt|t_B|lt10ns 2 jets with each ptgt10 GeV and |eta|lt25
bull PreselectionDi-muon trigger has fired [2MU_A_L2M0 || 2MU_A_L2M0_TRK5 || 2MU_A_L2M0_TRK10 || 2MU_A_L2M0_L3L6 || 2 MU_A_L2M0_L3L15]goodbad run selectioncentral track match amp isolation for both muons1 muon ptgt20 GeV 1 muon ptgt8 GeV1 jet ptgt15 GeV 1 jet ptgt10 GeV di-muon angle ∆Rmu1mu2gt10 to reject QCD events
rarr 666 events
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 6
Isolation Efficiency
εData = 0942 εMC
εData = 817εMC = 869
cone core
SRC track
hollow cone Σ ET lt Eisoi
i
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 7
Di-Muon Trigger Efficiency
TriggerEfficiency Class(Brigitte Vachon top group)
Weight all MC events with respect to muon jet MET and data luminosity so that all di-muon trigger inefficiencies are described
Estimate systematic error by varying the correction factor by plusmn1 σ
pT of 2 muon [GeV]
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 8
x-sections from Pythia is only LOThe ldquok factorrdquo is a common correction
rarr weight Z-MC events with k(Mmicromicro)
L ONL Ok σσ sdot=
additional correction
[GeV])γ(Z10 10
210
3
k-fa
cto
r
1
12
14
16
18
2
+ 100 MeVΛNLO
= 209 MeVΛNLO
- 100 MeVΛNLO
NNLO CTEQ6
NNLO CTEQ5
Correction Factor K for LO ZDY x-section
πmicroαπ
2
)(
3
41
3
41 2 S
NLOk sdot
++=
LONLOk σσ sdot=
Referencesbull R Hamberg et al A COMPLETE CALCULATION OF THE ORDER ALPHA-S2
CORRECTION TO THE DRELL-YAN K FACTOR NuclPhysB359343-4051991 bull K Hagiwara et al Particle Data Group Phys Rev D 66 010001 (2002) bull T Nunnemann D0 Note 4476
NNLO
NNLO correction with CTEQ6is used to weight the Zγ
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 9
Control Plots of the Data Sample (1)
PT for the most energetic muon PT for the second energetic muon sum of PT of muon
Angle between both muons Angle between both muons
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 10
Control Plots of the Data Sample (2)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 11
Control Plots of the Data Sample (3)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 12
Final Cuts
cut range pT micro1 gt 2125 GeV + 1580 (Mmicro - Mχ)pT micro1 + pT micro2 gt 60 GeVjet1 pT gt 25 GeVmissing ET lt 60 GeV
π ndash 1 lt ∆φ (micro1jeti) lt π + 105 lt ∆φ (micro2jeti) lt 2591 GeV-5Mχ lt inv Mmicromicro lt 91 GeV+5MχMχ ndash 30 GeV lt inv Mmicro2jet1jet2 lt Mχ + 30 GeVMmicro ndash 02Mmicro lt inv Mmicro1micro2jet1jet2lt Mmicro + 02Mmicro
Details on the cut flow can be found in Note 4485bull There remain about 20 more data events than expected SM events
after the cut on the inv di-muon mass is appliedbull I am investigating this currently
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13
Signal MonteCarlo (SUSYGEN)
Invariant mass of2 jets and 2 muons
Invariant mass of2 jets and the lower energetic muon
muon is from χ-decaymuon is from micro-decayneither nor
~
~
Generated with Susygenand passed throughfull detector simulation ampreconstruction
mass χ = 102 GeVmass micro = 262 GeV
~~
01
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14
Signal Region (mχ=102GeV mmicro=263GeV)
rarr good agreement between data and standard model background
Cut to remove the remainingZ0 background
~ ~1
Inv di-muon mass
After all cuts for thismSUGRA point21 events expected1 data events found(37 signal events)
Inv mass of muon1 muon2 jet1 amp jet2
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15
Signal Efficiencies
constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)
The neutralino decays only with ~50 prop to two muons and two jets
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 2
R-parity Violating Supersymmetry
baiabi
czk
cyj
cxixyzijk
ck
bj
aiabijk
ck
bj
aiabijkR
RMSSM
HLDDUDQLELLW
WWW
P
P
2
2
1 εκελελελ +++=
+=
SLBPR 23)1( parity-R ++minus=
ReferencesH Dreiner etal Search for R-Parity Violation at Run-II of the Tevatron hep-ph9906224 NGhodbane SKatsanevas PMorawitz EPerez SUSYGEN 3 hep-ph9909499
ijk = 123 generation indices
Chiral superfieldsL lepton doublet superfieldQ quark doublet superfieldD down-like quark singlet superfield
λ λ` λ`` Yukawa couplings
Resonant production
Assuming a non-zero λ`211 coupling leads to muon (2nd gen) and two jets (1st gen) final states
tri-lepton channelAnne-Marie Daniela
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 3
Neutralino Production amp Decay
production decay
Final statetwo (isolated) muonstwo jets
Other modesbull sneutrino resonance rarr 2 jets MET amp perh 1 microbull neutralino pair production and decay over λ`211
bull t-channel slepton exchange
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 4
Run I Exclusion Contour
DOslash Collaboration PhysRevLetter 89 (2002) hep-ex0111053
( )
1
02βtan
0A0
minus=
==
micromicro
mSUGRA parametersm0 universal soft breaking mass
parameter for scalars m12 universal soft braking mass
parameter for gauginosA0 trilinear coupling term sign(micro) higgs mass mixing parametertan(β) ratio of the vacuum expectation
of the neutral higgs fields
m0 m12 and A0 are defined at the GUT scale
DOslash Run I
Plots for this point
Limits forMχ = 75 100 GeV ampMmicro = 200 300 GeV
~
~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 5
Data Sample amp Preselection
bull Total delivered L=209pb- 1 good amp reconstructed L=154pb- 1
bull Data taking period April 2002 ndash September 2003bull Di-muon data sample ~4 of all data
bull Re-skim (6 of di-muon sample 297k events) 2 muons with ptgt5 GeV and ptgt3 GeV and a good central track match Anti cosmic cuts |t_A|lt10ns -15nslt|t_B|lt10ns 2 jets with each ptgt10 GeV and |eta|lt25
bull PreselectionDi-muon trigger has fired [2MU_A_L2M0 || 2MU_A_L2M0_TRK5 || 2MU_A_L2M0_TRK10 || 2MU_A_L2M0_L3L6 || 2 MU_A_L2M0_L3L15]goodbad run selectioncentral track match amp isolation for both muons1 muon ptgt20 GeV 1 muon ptgt8 GeV1 jet ptgt15 GeV 1 jet ptgt10 GeV di-muon angle ∆Rmu1mu2gt10 to reject QCD events
rarr 666 events
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 6
Isolation Efficiency
εData = 0942 εMC
εData = 817εMC = 869
cone core
SRC track
hollow cone Σ ET lt Eisoi
i
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 7
Di-Muon Trigger Efficiency
TriggerEfficiency Class(Brigitte Vachon top group)
Weight all MC events with respect to muon jet MET and data luminosity so that all di-muon trigger inefficiencies are described
Estimate systematic error by varying the correction factor by plusmn1 σ
pT of 2 muon [GeV]
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 8
x-sections from Pythia is only LOThe ldquok factorrdquo is a common correction
rarr weight Z-MC events with k(Mmicromicro)
L ONL Ok σσ sdot=
additional correction
[GeV])γ(Z10 10
210
3
k-fa
cto
r
1
12
14
16
18
2
+ 100 MeVΛNLO
= 209 MeVΛNLO
- 100 MeVΛNLO
NNLO CTEQ6
NNLO CTEQ5
Correction Factor K for LO ZDY x-section
πmicroαπ
2
)(
3
41
3
41 2 S
NLOk sdot
++=
LONLOk σσ sdot=
Referencesbull R Hamberg et al A COMPLETE CALCULATION OF THE ORDER ALPHA-S2
CORRECTION TO THE DRELL-YAN K FACTOR NuclPhysB359343-4051991 bull K Hagiwara et al Particle Data Group Phys Rev D 66 010001 (2002) bull T Nunnemann D0 Note 4476
NNLO
NNLO correction with CTEQ6is used to weight the Zγ
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 9
Control Plots of the Data Sample (1)
PT for the most energetic muon PT for the second energetic muon sum of PT of muon
Angle between both muons Angle between both muons
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 10
Control Plots of the Data Sample (2)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 11
Control Plots of the Data Sample (3)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 12
Final Cuts
cut range pT micro1 gt 2125 GeV + 1580 (Mmicro - Mχ)pT micro1 + pT micro2 gt 60 GeVjet1 pT gt 25 GeVmissing ET lt 60 GeV
π ndash 1 lt ∆φ (micro1jeti) lt π + 105 lt ∆φ (micro2jeti) lt 2591 GeV-5Mχ lt inv Mmicromicro lt 91 GeV+5MχMχ ndash 30 GeV lt inv Mmicro2jet1jet2 lt Mχ + 30 GeVMmicro ndash 02Mmicro lt inv Mmicro1micro2jet1jet2lt Mmicro + 02Mmicro
Details on the cut flow can be found in Note 4485bull There remain about 20 more data events than expected SM events
after the cut on the inv di-muon mass is appliedbull I am investigating this currently
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13
Signal MonteCarlo (SUSYGEN)
Invariant mass of2 jets and 2 muons
Invariant mass of2 jets and the lower energetic muon
muon is from χ-decaymuon is from micro-decayneither nor
~
~
Generated with Susygenand passed throughfull detector simulation ampreconstruction
mass χ = 102 GeVmass micro = 262 GeV
~~
01
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14
Signal Region (mχ=102GeV mmicro=263GeV)
rarr good agreement between data and standard model background
Cut to remove the remainingZ0 background
~ ~1
Inv di-muon mass
After all cuts for thismSUGRA point21 events expected1 data events found(37 signal events)
Inv mass of muon1 muon2 jet1 amp jet2
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15
Signal Efficiencies
constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)
The neutralino decays only with ~50 prop to two muons and two jets
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 3
Neutralino Production amp Decay
production decay
Final statetwo (isolated) muonstwo jets
Other modesbull sneutrino resonance rarr 2 jets MET amp perh 1 microbull neutralino pair production and decay over λ`211
bull t-channel slepton exchange
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 4
Run I Exclusion Contour
DOslash Collaboration PhysRevLetter 89 (2002) hep-ex0111053
( )
1
02βtan
0A0
minus=
==
micromicro
mSUGRA parametersm0 universal soft breaking mass
parameter for scalars m12 universal soft braking mass
parameter for gauginosA0 trilinear coupling term sign(micro) higgs mass mixing parametertan(β) ratio of the vacuum expectation
of the neutral higgs fields
m0 m12 and A0 are defined at the GUT scale
DOslash Run I
Plots for this point
Limits forMχ = 75 100 GeV ampMmicro = 200 300 GeV
~
~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 5
Data Sample amp Preselection
bull Total delivered L=209pb- 1 good amp reconstructed L=154pb- 1
bull Data taking period April 2002 ndash September 2003bull Di-muon data sample ~4 of all data
bull Re-skim (6 of di-muon sample 297k events) 2 muons with ptgt5 GeV and ptgt3 GeV and a good central track match Anti cosmic cuts |t_A|lt10ns -15nslt|t_B|lt10ns 2 jets with each ptgt10 GeV and |eta|lt25
bull PreselectionDi-muon trigger has fired [2MU_A_L2M0 || 2MU_A_L2M0_TRK5 || 2MU_A_L2M0_TRK10 || 2MU_A_L2M0_L3L6 || 2 MU_A_L2M0_L3L15]goodbad run selectioncentral track match amp isolation for both muons1 muon ptgt20 GeV 1 muon ptgt8 GeV1 jet ptgt15 GeV 1 jet ptgt10 GeV di-muon angle ∆Rmu1mu2gt10 to reject QCD events
rarr 666 events
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 6
Isolation Efficiency
εData = 0942 εMC
εData = 817εMC = 869
cone core
SRC track
hollow cone Σ ET lt Eisoi
i
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 7
Di-Muon Trigger Efficiency
TriggerEfficiency Class(Brigitte Vachon top group)
Weight all MC events with respect to muon jet MET and data luminosity so that all di-muon trigger inefficiencies are described
Estimate systematic error by varying the correction factor by plusmn1 σ
pT of 2 muon [GeV]
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 8
x-sections from Pythia is only LOThe ldquok factorrdquo is a common correction
rarr weight Z-MC events with k(Mmicromicro)
L ONL Ok σσ sdot=
additional correction
[GeV])γ(Z10 10
210
3
k-fa
cto
r
1
12
14
16
18
2
+ 100 MeVΛNLO
= 209 MeVΛNLO
- 100 MeVΛNLO
NNLO CTEQ6
NNLO CTEQ5
Correction Factor K for LO ZDY x-section
πmicroαπ
2
)(
3
41
3
41 2 S
NLOk sdot
++=
LONLOk σσ sdot=
Referencesbull R Hamberg et al A COMPLETE CALCULATION OF THE ORDER ALPHA-S2
CORRECTION TO THE DRELL-YAN K FACTOR NuclPhysB359343-4051991 bull K Hagiwara et al Particle Data Group Phys Rev D 66 010001 (2002) bull T Nunnemann D0 Note 4476
NNLO
NNLO correction with CTEQ6is used to weight the Zγ
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 9
Control Plots of the Data Sample (1)
PT for the most energetic muon PT for the second energetic muon sum of PT of muon
Angle between both muons Angle between both muons
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 10
Control Plots of the Data Sample (2)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 11
Control Plots of the Data Sample (3)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 12
Final Cuts
cut range pT micro1 gt 2125 GeV + 1580 (Mmicro - Mχ)pT micro1 + pT micro2 gt 60 GeVjet1 pT gt 25 GeVmissing ET lt 60 GeV
π ndash 1 lt ∆φ (micro1jeti) lt π + 105 lt ∆φ (micro2jeti) lt 2591 GeV-5Mχ lt inv Mmicromicro lt 91 GeV+5MχMχ ndash 30 GeV lt inv Mmicro2jet1jet2 lt Mχ + 30 GeVMmicro ndash 02Mmicro lt inv Mmicro1micro2jet1jet2lt Mmicro + 02Mmicro
Details on the cut flow can be found in Note 4485bull There remain about 20 more data events than expected SM events
after the cut on the inv di-muon mass is appliedbull I am investigating this currently
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13
Signal MonteCarlo (SUSYGEN)
Invariant mass of2 jets and 2 muons
Invariant mass of2 jets and the lower energetic muon
muon is from χ-decaymuon is from micro-decayneither nor
~
~
Generated with Susygenand passed throughfull detector simulation ampreconstruction
mass χ = 102 GeVmass micro = 262 GeV
~~
01
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14
Signal Region (mχ=102GeV mmicro=263GeV)
rarr good agreement between data and standard model background
Cut to remove the remainingZ0 background
~ ~1
Inv di-muon mass
After all cuts for thismSUGRA point21 events expected1 data events found(37 signal events)
Inv mass of muon1 muon2 jet1 amp jet2
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15
Signal Efficiencies
constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)
The neutralino decays only with ~50 prop to two muons and two jets
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 4
Run I Exclusion Contour
DOslash Collaboration PhysRevLetter 89 (2002) hep-ex0111053
( )
1
02βtan
0A0
minus=
==
micromicro
mSUGRA parametersm0 universal soft breaking mass
parameter for scalars m12 universal soft braking mass
parameter for gauginosA0 trilinear coupling term sign(micro) higgs mass mixing parametertan(β) ratio of the vacuum expectation
of the neutral higgs fields
m0 m12 and A0 are defined at the GUT scale
DOslash Run I
Plots for this point
Limits forMχ = 75 100 GeV ampMmicro = 200 300 GeV
~
~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 5
Data Sample amp Preselection
bull Total delivered L=209pb- 1 good amp reconstructed L=154pb- 1
bull Data taking period April 2002 ndash September 2003bull Di-muon data sample ~4 of all data
bull Re-skim (6 of di-muon sample 297k events) 2 muons with ptgt5 GeV and ptgt3 GeV and a good central track match Anti cosmic cuts |t_A|lt10ns -15nslt|t_B|lt10ns 2 jets with each ptgt10 GeV and |eta|lt25
bull PreselectionDi-muon trigger has fired [2MU_A_L2M0 || 2MU_A_L2M0_TRK5 || 2MU_A_L2M0_TRK10 || 2MU_A_L2M0_L3L6 || 2 MU_A_L2M0_L3L15]goodbad run selectioncentral track match amp isolation for both muons1 muon ptgt20 GeV 1 muon ptgt8 GeV1 jet ptgt15 GeV 1 jet ptgt10 GeV di-muon angle ∆Rmu1mu2gt10 to reject QCD events
rarr 666 events
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 6
Isolation Efficiency
εData = 0942 εMC
εData = 817εMC = 869
cone core
SRC track
hollow cone Σ ET lt Eisoi
i
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 7
Di-Muon Trigger Efficiency
TriggerEfficiency Class(Brigitte Vachon top group)
Weight all MC events with respect to muon jet MET and data luminosity so that all di-muon trigger inefficiencies are described
Estimate systematic error by varying the correction factor by plusmn1 σ
pT of 2 muon [GeV]
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 8
x-sections from Pythia is only LOThe ldquok factorrdquo is a common correction
rarr weight Z-MC events with k(Mmicromicro)
L ONL Ok σσ sdot=
additional correction
[GeV])γ(Z10 10
210
3
k-fa
cto
r
1
12
14
16
18
2
+ 100 MeVΛNLO
= 209 MeVΛNLO
- 100 MeVΛNLO
NNLO CTEQ6
NNLO CTEQ5
Correction Factor K for LO ZDY x-section
πmicroαπ
2
)(
3
41
3
41 2 S
NLOk sdot
++=
LONLOk σσ sdot=
Referencesbull R Hamberg et al A COMPLETE CALCULATION OF THE ORDER ALPHA-S2
CORRECTION TO THE DRELL-YAN K FACTOR NuclPhysB359343-4051991 bull K Hagiwara et al Particle Data Group Phys Rev D 66 010001 (2002) bull T Nunnemann D0 Note 4476
NNLO
NNLO correction with CTEQ6is used to weight the Zγ
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 9
Control Plots of the Data Sample (1)
PT for the most energetic muon PT for the second energetic muon sum of PT of muon
Angle between both muons Angle between both muons
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 10
Control Plots of the Data Sample (2)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 11
Control Plots of the Data Sample (3)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 12
Final Cuts
cut range pT micro1 gt 2125 GeV + 1580 (Mmicro - Mχ)pT micro1 + pT micro2 gt 60 GeVjet1 pT gt 25 GeVmissing ET lt 60 GeV
π ndash 1 lt ∆φ (micro1jeti) lt π + 105 lt ∆φ (micro2jeti) lt 2591 GeV-5Mχ lt inv Mmicromicro lt 91 GeV+5MχMχ ndash 30 GeV lt inv Mmicro2jet1jet2 lt Mχ + 30 GeVMmicro ndash 02Mmicro lt inv Mmicro1micro2jet1jet2lt Mmicro + 02Mmicro
Details on the cut flow can be found in Note 4485bull There remain about 20 more data events than expected SM events
after the cut on the inv di-muon mass is appliedbull I am investigating this currently
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13
Signal MonteCarlo (SUSYGEN)
Invariant mass of2 jets and 2 muons
Invariant mass of2 jets and the lower energetic muon
muon is from χ-decaymuon is from micro-decayneither nor
~
~
Generated with Susygenand passed throughfull detector simulation ampreconstruction
mass χ = 102 GeVmass micro = 262 GeV
~~
01
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14
Signal Region (mχ=102GeV mmicro=263GeV)
rarr good agreement between data and standard model background
Cut to remove the remainingZ0 background
~ ~1
Inv di-muon mass
After all cuts for thismSUGRA point21 events expected1 data events found(37 signal events)
Inv mass of muon1 muon2 jet1 amp jet2
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15
Signal Efficiencies
constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)
The neutralino decays only with ~50 prop to two muons and two jets
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 5
Data Sample amp Preselection
bull Total delivered L=209pb- 1 good amp reconstructed L=154pb- 1
bull Data taking period April 2002 ndash September 2003bull Di-muon data sample ~4 of all data
bull Re-skim (6 of di-muon sample 297k events) 2 muons with ptgt5 GeV and ptgt3 GeV and a good central track match Anti cosmic cuts |t_A|lt10ns -15nslt|t_B|lt10ns 2 jets with each ptgt10 GeV and |eta|lt25
bull PreselectionDi-muon trigger has fired [2MU_A_L2M0 || 2MU_A_L2M0_TRK5 || 2MU_A_L2M0_TRK10 || 2MU_A_L2M0_L3L6 || 2 MU_A_L2M0_L3L15]goodbad run selectioncentral track match amp isolation for both muons1 muon ptgt20 GeV 1 muon ptgt8 GeV1 jet ptgt15 GeV 1 jet ptgt10 GeV di-muon angle ∆Rmu1mu2gt10 to reject QCD events
rarr 666 events
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 6
Isolation Efficiency
εData = 0942 εMC
εData = 817εMC = 869
cone core
SRC track
hollow cone Σ ET lt Eisoi
i
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 7
Di-Muon Trigger Efficiency
TriggerEfficiency Class(Brigitte Vachon top group)
Weight all MC events with respect to muon jet MET and data luminosity so that all di-muon trigger inefficiencies are described
Estimate systematic error by varying the correction factor by plusmn1 σ
pT of 2 muon [GeV]
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 8
x-sections from Pythia is only LOThe ldquok factorrdquo is a common correction
rarr weight Z-MC events with k(Mmicromicro)
L ONL Ok σσ sdot=
additional correction
[GeV])γ(Z10 10
210
3
k-fa
cto
r
1
12
14
16
18
2
+ 100 MeVΛNLO
= 209 MeVΛNLO
- 100 MeVΛNLO
NNLO CTEQ6
NNLO CTEQ5
Correction Factor K for LO ZDY x-section
πmicroαπ
2
)(
3
41
3
41 2 S
NLOk sdot
++=
LONLOk σσ sdot=
Referencesbull R Hamberg et al A COMPLETE CALCULATION OF THE ORDER ALPHA-S2
CORRECTION TO THE DRELL-YAN K FACTOR NuclPhysB359343-4051991 bull K Hagiwara et al Particle Data Group Phys Rev D 66 010001 (2002) bull T Nunnemann D0 Note 4476
NNLO
NNLO correction with CTEQ6is used to weight the Zγ
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 9
Control Plots of the Data Sample (1)
PT for the most energetic muon PT for the second energetic muon sum of PT of muon
Angle between both muons Angle between both muons
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 10
Control Plots of the Data Sample (2)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 11
Control Plots of the Data Sample (3)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 12
Final Cuts
cut range pT micro1 gt 2125 GeV + 1580 (Mmicro - Mχ)pT micro1 + pT micro2 gt 60 GeVjet1 pT gt 25 GeVmissing ET lt 60 GeV
π ndash 1 lt ∆φ (micro1jeti) lt π + 105 lt ∆φ (micro2jeti) lt 2591 GeV-5Mχ lt inv Mmicromicro lt 91 GeV+5MχMχ ndash 30 GeV lt inv Mmicro2jet1jet2 lt Mχ + 30 GeVMmicro ndash 02Mmicro lt inv Mmicro1micro2jet1jet2lt Mmicro + 02Mmicro
Details on the cut flow can be found in Note 4485bull There remain about 20 more data events than expected SM events
after the cut on the inv di-muon mass is appliedbull I am investigating this currently
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13
Signal MonteCarlo (SUSYGEN)
Invariant mass of2 jets and 2 muons
Invariant mass of2 jets and the lower energetic muon
muon is from χ-decaymuon is from micro-decayneither nor
~
~
Generated with Susygenand passed throughfull detector simulation ampreconstruction
mass χ = 102 GeVmass micro = 262 GeV
~~
01
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14
Signal Region (mχ=102GeV mmicro=263GeV)
rarr good agreement between data and standard model background
Cut to remove the remainingZ0 background
~ ~1
Inv di-muon mass
After all cuts for thismSUGRA point21 events expected1 data events found(37 signal events)
Inv mass of muon1 muon2 jet1 amp jet2
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15
Signal Efficiencies
constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)
The neutralino decays only with ~50 prop to two muons and two jets
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 6
Isolation Efficiency
εData = 0942 εMC
εData = 817εMC = 869
cone core
SRC track
hollow cone Σ ET lt Eisoi
i
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 7
Di-Muon Trigger Efficiency
TriggerEfficiency Class(Brigitte Vachon top group)
Weight all MC events with respect to muon jet MET and data luminosity so that all di-muon trigger inefficiencies are described
Estimate systematic error by varying the correction factor by plusmn1 σ
pT of 2 muon [GeV]
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 8
x-sections from Pythia is only LOThe ldquok factorrdquo is a common correction
rarr weight Z-MC events with k(Mmicromicro)
L ONL Ok σσ sdot=
additional correction
[GeV])γ(Z10 10
210
3
k-fa
cto
r
1
12
14
16
18
2
+ 100 MeVΛNLO
= 209 MeVΛNLO
- 100 MeVΛNLO
NNLO CTEQ6
NNLO CTEQ5
Correction Factor K for LO ZDY x-section
πmicroαπ
2
)(
3
41
3
41 2 S
NLOk sdot
++=
LONLOk σσ sdot=
Referencesbull R Hamberg et al A COMPLETE CALCULATION OF THE ORDER ALPHA-S2
CORRECTION TO THE DRELL-YAN K FACTOR NuclPhysB359343-4051991 bull K Hagiwara et al Particle Data Group Phys Rev D 66 010001 (2002) bull T Nunnemann D0 Note 4476
NNLO
NNLO correction with CTEQ6is used to weight the Zγ
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 9
Control Plots of the Data Sample (1)
PT for the most energetic muon PT for the second energetic muon sum of PT of muon
Angle between both muons Angle between both muons
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 10
Control Plots of the Data Sample (2)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 11
Control Plots of the Data Sample (3)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 12
Final Cuts
cut range pT micro1 gt 2125 GeV + 1580 (Mmicro - Mχ)pT micro1 + pT micro2 gt 60 GeVjet1 pT gt 25 GeVmissing ET lt 60 GeV
π ndash 1 lt ∆φ (micro1jeti) lt π + 105 lt ∆φ (micro2jeti) lt 2591 GeV-5Mχ lt inv Mmicromicro lt 91 GeV+5MχMχ ndash 30 GeV lt inv Mmicro2jet1jet2 lt Mχ + 30 GeVMmicro ndash 02Mmicro lt inv Mmicro1micro2jet1jet2lt Mmicro + 02Mmicro
Details on the cut flow can be found in Note 4485bull There remain about 20 more data events than expected SM events
after the cut on the inv di-muon mass is appliedbull I am investigating this currently
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13
Signal MonteCarlo (SUSYGEN)
Invariant mass of2 jets and 2 muons
Invariant mass of2 jets and the lower energetic muon
muon is from χ-decaymuon is from micro-decayneither nor
~
~
Generated with Susygenand passed throughfull detector simulation ampreconstruction
mass χ = 102 GeVmass micro = 262 GeV
~~
01
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14
Signal Region (mχ=102GeV mmicro=263GeV)
rarr good agreement between data and standard model background
Cut to remove the remainingZ0 background
~ ~1
Inv di-muon mass
After all cuts for thismSUGRA point21 events expected1 data events found(37 signal events)
Inv mass of muon1 muon2 jet1 amp jet2
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15
Signal Efficiencies
constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)
The neutralino decays only with ~50 prop to two muons and two jets
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 7
Di-Muon Trigger Efficiency
TriggerEfficiency Class(Brigitte Vachon top group)
Weight all MC events with respect to muon jet MET and data luminosity so that all di-muon trigger inefficiencies are described
Estimate systematic error by varying the correction factor by plusmn1 σ
pT of 2 muon [GeV]
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 8
x-sections from Pythia is only LOThe ldquok factorrdquo is a common correction
rarr weight Z-MC events with k(Mmicromicro)
L ONL Ok σσ sdot=
additional correction
[GeV])γ(Z10 10
210
3
k-fa
cto
r
1
12
14
16
18
2
+ 100 MeVΛNLO
= 209 MeVΛNLO
- 100 MeVΛNLO
NNLO CTEQ6
NNLO CTEQ5
Correction Factor K for LO ZDY x-section
πmicroαπ
2
)(
3
41
3
41 2 S
NLOk sdot
++=
LONLOk σσ sdot=
Referencesbull R Hamberg et al A COMPLETE CALCULATION OF THE ORDER ALPHA-S2
CORRECTION TO THE DRELL-YAN K FACTOR NuclPhysB359343-4051991 bull K Hagiwara et al Particle Data Group Phys Rev D 66 010001 (2002) bull T Nunnemann D0 Note 4476
NNLO
NNLO correction with CTEQ6is used to weight the Zγ
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 9
Control Plots of the Data Sample (1)
PT for the most energetic muon PT for the second energetic muon sum of PT of muon
Angle between both muons Angle between both muons
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 10
Control Plots of the Data Sample (2)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 11
Control Plots of the Data Sample (3)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 12
Final Cuts
cut range pT micro1 gt 2125 GeV + 1580 (Mmicro - Mχ)pT micro1 + pT micro2 gt 60 GeVjet1 pT gt 25 GeVmissing ET lt 60 GeV
π ndash 1 lt ∆φ (micro1jeti) lt π + 105 lt ∆φ (micro2jeti) lt 2591 GeV-5Mχ lt inv Mmicromicro lt 91 GeV+5MχMχ ndash 30 GeV lt inv Mmicro2jet1jet2 lt Mχ + 30 GeVMmicro ndash 02Mmicro lt inv Mmicro1micro2jet1jet2lt Mmicro + 02Mmicro
Details on the cut flow can be found in Note 4485bull There remain about 20 more data events than expected SM events
after the cut on the inv di-muon mass is appliedbull I am investigating this currently
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13
Signal MonteCarlo (SUSYGEN)
Invariant mass of2 jets and 2 muons
Invariant mass of2 jets and the lower energetic muon
muon is from χ-decaymuon is from micro-decayneither nor
~
~
Generated with Susygenand passed throughfull detector simulation ampreconstruction
mass χ = 102 GeVmass micro = 262 GeV
~~
01
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14
Signal Region (mχ=102GeV mmicro=263GeV)
rarr good agreement between data and standard model background
Cut to remove the remainingZ0 background
~ ~1
Inv di-muon mass
After all cuts for thismSUGRA point21 events expected1 data events found(37 signal events)
Inv mass of muon1 muon2 jet1 amp jet2
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15
Signal Efficiencies
constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)
The neutralino decays only with ~50 prop to two muons and two jets
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 8
x-sections from Pythia is only LOThe ldquok factorrdquo is a common correction
rarr weight Z-MC events with k(Mmicromicro)
L ONL Ok σσ sdot=
additional correction
[GeV])γ(Z10 10
210
3
k-fa
cto
r
1
12
14
16
18
2
+ 100 MeVΛNLO
= 209 MeVΛNLO
- 100 MeVΛNLO
NNLO CTEQ6
NNLO CTEQ5
Correction Factor K for LO ZDY x-section
πmicroαπ
2
)(
3
41
3
41 2 S
NLOk sdot
++=
LONLOk σσ sdot=
Referencesbull R Hamberg et al A COMPLETE CALCULATION OF THE ORDER ALPHA-S2
CORRECTION TO THE DRELL-YAN K FACTOR NuclPhysB359343-4051991 bull K Hagiwara et al Particle Data Group Phys Rev D 66 010001 (2002) bull T Nunnemann D0 Note 4476
NNLO
NNLO correction with CTEQ6is used to weight the Zγ
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 9
Control Plots of the Data Sample (1)
PT for the most energetic muon PT for the second energetic muon sum of PT of muon
Angle between both muons Angle between both muons
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 10
Control Plots of the Data Sample (2)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 11
Control Plots of the Data Sample (3)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 12
Final Cuts
cut range pT micro1 gt 2125 GeV + 1580 (Mmicro - Mχ)pT micro1 + pT micro2 gt 60 GeVjet1 pT gt 25 GeVmissing ET lt 60 GeV
π ndash 1 lt ∆φ (micro1jeti) lt π + 105 lt ∆φ (micro2jeti) lt 2591 GeV-5Mχ lt inv Mmicromicro lt 91 GeV+5MχMχ ndash 30 GeV lt inv Mmicro2jet1jet2 lt Mχ + 30 GeVMmicro ndash 02Mmicro lt inv Mmicro1micro2jet1jet2lt Mmicro + 02Mmicro
Details on the cut flow can be found in Note 4485bull There remain about 20 more data events than expected SM events
after the cut on the inv di-muon mass is appliedbull I am investigating this currently
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13
Signal MonteCarlo (SUSYGEN)
Invariant mass of2 jets and 2 muons
Invariant mass of2 jets and the lower energetic muon
muon is from χ-decaymuon is from micro-decayneither nor
~
~
Generated with Susygenand passed throughfull detector simulation ampreconstruction
mass χ = 102 GeVmass micro = 262 GeV
~~
01
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14
Signal Region (mχ=102GeV mmicro=263GeV)
rarr good agreement between data and standard model background
Cut to remove the remainingZ0 background
~ ~1
Inv di-muon mass
After all cuts for thismSUGRA point21 events expected1 data events found(37 signal events)
Inv mass of muon1 muon2 jet1 amp jet2
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15
Signal Efficiencies
constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)
The neutralino decays only with ~50 prop to two muons and two jets
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 9
Control Plots of the Data Sample (1)
PT for the most energetic muon PT for the second energetic muon sum of PT of muon
Angle between both muons Angle between both muons
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 10
Control Plots of the Data Sample (2)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 11
Control Plots of the Data Sample (3)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 12
Final Cuts
cut range pT micro1 gt 2125 GeV + 1580 (Mmicro - Mχ)pT micro1 + pT micro2 gt 60 GeVjet1 pT gt 25 GeVmissing ET lt 60 GeV
π ndash 1 lt ∆φ (micro1jeti) lt π + 105 lt ∆φ (micro2jeti) lt 2591 GeV-5Mχ lt inv Mmicromicro lt 91 GeV+5MχMχ ndash 30 GeV lt inv Mmicro2jet1jet2 lt Mχ + 30 GeVMmicro ndash 02Mmicro lt inv Mmicro1micro2jet1jet2lt Mmicro + 02Mmicro
Details on the cut flow can be found in Note 4485bull There remain about 20 more data events than expected SM events
after the cut on the inv di-muon mass is appliedbull I am investigating this currently
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13
Signal MonteCarlo (SUSYGEN)
Invariant mass of2 jets and 2 muons
Invariant mass of2 jets and the lower energetic muon
muon is from χ-decaymuon is from micro-decayneither nor
~
~
Generated with Susygenand passed throughfull detector simulation ampreconstruction
mass χ = 102 GeVmass micro = 262 GeV
~~
01
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14
Signal Region (mχ=102GeV mmicro=263GeV)
rarr good agreement between data and standard model background
Cut to remove the remainingZ0 background
~ ~1
Inv di-muon mass
After all cuts for thismSUGRA point21 events expected1 data events found(37 signal events)
Inv mass of muon1 muon2 jet1 amp jet2
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15
Signal Efficiencies
constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)
The neutralino decays only with ~50 prop to two muons and two jets
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 10
Control Plots of the Data Sample (2)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 11
Control Plots of the Data Sample (3)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 12
Final Cuts
cut range pT micro1 gt 2125 GeV + 1580 (Mmicro - Mχ)pT micro1 + pT micro2 gt 60 GeVjet1 pT gt 25 GeVmissing ET lt 60 GeV
π ndash 1 lt ∆φ (micro1jeti) lt π + 105 lt ∆φ (micro2jeti) lt 2591 GeV-5Mχ lt inv Mmicromicro lt 91 GeV+5MχMχ ndash 30 GeV lt inv Mmicro2jet1jet2 lt Mχ + 30 GeVMmicro ndash 02Mmicro lt inv Mmicro1micro2jet1jet2lt Mmicro + 02Mmicro
Details on the cut flow can be found in Note 4485bull There remain about 20 more data events than expected SM events
after the cut on the inv di-muon mass is appliedbull I am investigating this currently
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13
Signal MonteCarlo (SUSYGEN)
Invariant mass of2 jets and 2 muons
Invariant mass of2 jets and the lower energetic muon
muon is from χ-decaymuon is from micro-decayneither nor
~
~
Generated with Susygenand passed throughfull detector simulation ampreconstruction
mass χ = 102 GeVmass micro = 262 GeV
~~
01
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14
Signal Region (mχ=102GeV mmicro=263GeV)
rarr good agreement between data and standard model background
Cut to remove the remainingZ0 background
~ ~1
Inv di-muon mass
After all cuts for thismSUGRA point21 events expected1 data events found(37 signal events)
Inv mass of muon1 muon2 jet1 amp jet2
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15
Signal Efficiencies
constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)
The neutralino decays only with ~50 prop to two muons and two jets
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 11
Control Plots of the Data Sample (3)
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 12
Final Cuts
cut range pT micro1 gt 2125 GeV + 1580 (Mmicro - Mχ)pT micro1 + pT micro2 gt 60 GeVjet1 pT gt 25 GeVmissing ET lt 60 GeV
π ndash 1 lt ∆φ (micro1jeti) lt π + 105 lt ∆φ (micro2jeti) lt 2591 GeV-5Mχ lt inv Mmicromicro lt 91 GeV+5MχMχ ndash 30 GeV lt inv Mmicro2jet1jet2 lt Mχ + 30 GeVMmicro ndash 02Mmicro lt inv Mmicro1micro2jet1jet2lt Mmicro + 02Mmicro
Details on the cut flow can be found in Note 4485bull There remain about 20 more data events than expected SM events
after the cut on the inv di-muon mass is appliedbull I am investigating this currently
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13
Signal MonteCarlo (SUSYGEN)
Invariant mass of2 jets and 2 muons
Invariant mass of2 jets and the lower energetic muon
muon is from χ-decaymuon is from micro-decayneither nor
~
~
Generated with Susygenand passed throughfull detector simulation ampreconstruction
mass χ = 102 GeVmass micro = 262 GeV
~~
01
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14
Signal Region (mχ=102GeV mmicro=263GeV)
rarr good agreement between data and standard model background
Cut to remove the remainingZ0 background
~ ~1
Inv di-muon mass
After all cuts for thismSUGRA point21 events expected1 data events found(37 signal events)
Inv mass of muon1 muon2 jet1 amp jet2
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15
Signal Efficiencies
constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)
The neutralino decays only with ~50 prop to two muons and two jets
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 12
Final Cuts
cut range pT micro1 gt 2125 GeV + 1580 (Mmicro - Mχ)pT micro1 + pT micro2 gt 60 GeVjet1 pT gt 25 GeVmissing ET lt 60 GeV
π ndash 1 lt ∆φ (micro1jeti) lt π + 105 lt ∆φ (micro2jeti) lt 2591 GeV-5Mχ lt inv Mmicromicro lt 91 GeV+5MχMχ ndash 30 GeV lt inv Mmicro2jet1jet2 lt Mχ + 30 GeVMmicro ndash 02Mmicro lt inv Mmicro1micro2jet1jet2lt Mmicro + 02Mmicro
Details on the cut flow can be found in Note 4485bull There remain about 20 more data events than expected SM events
after the cut on the inv di-muon mass is appliedbull I am investigating this currently
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13
Signal MonteCarlo (SUSYGEN)
Invariant mass of2 jets and 2 muons
Invariant mass of2 jets and the lower energetic muon
muon is from χ-decaymuon is from micro-decayneither nor
~
~
Generated with Susygenand passed throughfull detector simulation ampreconstruction
mass χ = 102 GeVmass micro = 262 GeV
~~
01
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14
Signal Region (mχ=102GeV mmicro=263GeV)
rarr good agreement between data and standard model background
Cut to remove the remainingZ0 background
~ ~1
Inv di-muon mass
After all cuts for thismSUGRA point21 events expected1 data events found(37 signal events)
Inv mass of muon1 muon2 jet1 amp jet2
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15
Signal Efficiencies
constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)
The neutralino decays only with ~50 prop to two muons and two jets
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13
Signal MonteCarlo (SUSYGEN)
Invariant mass of2 jets and 2 muons
Invariant mass of2 jets and the lower energetic muon
muon is from χ-decaymuon is from micro-decayneither nor
~
~
Generated with Susygenand passed throughfull detector simulation ampreconstruction
mass χ = 102 GeVmass micro = 262 GeV
~~
01
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14
Signal Region (mχ=102GeV mmicro=263GeV)
rarr good agreement between data and standard model background
Cut to remove the remainingZ0 background
~ ~1
Inv di-muon mass
After all cuts for thismSUGRA point21 events expected1 data events found(37 signal events)
Inv mass of muon1 muon2 jet1 amp jet2
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15
Signal Efficiencies
constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)
The neutralino decays only with ~50 prop to two muons and two jets
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14
Signal Region (mχ=102GeV mmicro=263GeV)
rarr good agreement between data and standard model background
Cut to remove the remainingZ0 background
~ ~1
Inv di-muon mass
After all cuts for thismSUGRA point21 events expected1 data events found(37 signal events)
Inv mass of muon1 muon2 jet1 amp jet2
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15
Signal Efficiencies
constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)
The neutralino decays only with ~50 prop to two muons and two jets
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15
Signal Efficiencies
constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)
The neutralino decays only with ~50 prop to two muons and two jets
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 16
Signal x-section and Limit
mmicrolt265 GeV~
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available
1 July 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 17
Conclusion And Plans
bull Preselected data agrees well with background
described by Pythia (Zγ) incl MC
bull Exclusion Limits with 95 CL have been presented in
absence of an excess in the data
rarr Consider the systematic error of muon and jet pt smearing
rarr Improve signal efficiency Optimize cuts
rarr Donrsquot reject QCD events by cutting on the angle between the
two muons in the pre-selection
rarr Apply a more ldquosophisticatedrdquo final selection
DOslash Note 4485 with more detailed information is available