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Rare Kaon Decay Physics. Lepton Photon Symposium Augusto Ceccucci*/CERN Fermilab, August 11, 2003 *Member of the NA48 Collaboration. Why study Rare Kaon Decays. Search for explicit violation of Standard Model Lepton Flavour Violation Probe the flavour sector of the Standard Model FCNC - PowerPoint PPT Presentation
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August 11, 2003 LP2003, Augusto Ceccucci 1
Rare Kaon Decay Physics
Lepton Photon Symposium
Augusto Ceccucci*/CERNFermilab, August 11, 2003
*Member of the NA48 Collaboration
August 11, 2003 LP2003, Augusto Ceccucci 2
Why study Rare Kaon Decays
• Search for explicit violation of Standard Model – Lepton Flavour Violation
• Probe the flavour sector of the Standard Model– FCNC
• Test fundamental symmetries– CP,CPT
• Study the strong interactions at low energy – Chiral Perturbation Theory, Form Factors
•I will give a review of recent experimental results –In addition to KL and K+, also KS rare decays (BR≤10-8) start to be studied
•I will also briefly review the new initiatives that should lead to significant advance in the field by the end of this decade
August 11, 2003 LP2003, Augusto Ceccucci 3
Outline• Tests of the Standard Model
– KL→0 ee KTeV-E799 II (1999 data)– KS→0 ee NA48/1 CERN (2002 data)– K+→+ BNL-E787 (1997 data, region II)
• Other Tests of CP and CPT symmetry– KL→ee KTeV-E799 II (1999 data) – KS→30 NA48/1 (2000 data)– KS→ e KLOE Frascati (2001)
• Chiral Perturbation Theory– Dalitz decays: – KL→ee, KL→eeee, KL→ee KTeV-E799 II – Non-Leptonic decays– KL→ KLOE (2001+2002 data)– KS→NA48/1 (2000 data)– KS→0NA48/1 (2000 data)
August 11, 2003 LP2003, Augusto Ceccucci 4
Kaon Rare Decays and the SM
JCP=2(Triangle Area) is the unique measure of CP-Violation in SM
JCP = Im(Vud*VusVts
*Vtd) ~ cosc sinc Imt
In the Wolfenstein parameterisation (, A, , ): Im t = A2 5 , Re t = A2 5
CP
-Vio
lati
on
(holy grail)
August 11, 2003 LP2003, Augusto Ceccucci 5
Theory of KL→0ee ()
• Complete re-analysis of the decay:(Buchalla, D’Ambrosio, Isidori, hep-ph/0308008) BDI
• Short Distance (Direct CP-Violation)– From Standard Model fit: Im t = (1.36 ± 0.12) 10-4
(CKM)– B(KL→0ee)CPV-dir=(2.4 ± 0.2) ×10-12 × (Im t /10-4)2 = (3.2 ± 0.4) × 10-12
• Indirect CP-Violation– BR(KL→0 ee) CPV-ind ~1/330 BR(KS → 0 ee)– Direct and Indirect CP-Violating components interfere
• CP-Conserving contribution – Need model ind. 3 par. fit (Gabbiani, Valencia, PRD 64 2001)– BRCPC < 3 ×10-12 (conservative, BDI)
• They fix the 3 counterterms from KL→0 and KS→
August 11, 2003 LP2003, Augusto Ceccucci 6
KTeV-E799-II (FNAL)Pure CsI m~1 MeV
TRD
KL flux ~ 7 × 1011
August 11, 2003 LP2003, Augusto Ceccucci 7
Mode Upper Limit
90% CL
Ref.
KL→0 ee < 5.1 × 10-10 PRL86 (2001)
KL→ < 3.8 × 10-10 PRL84 (2000)
Experiment: KL→0ee ()Published data: E799-II (KTeV) 1997
• Irreducible background: KL→ ee()(Greenlee, 1990)
– Same final state as the signal, only mass resolution and kinematics are available to suppress these backgrounds
– To keep it to the ~1 event level the acceptance is quite reduced
– Possible future searches will be background dominated
KL→0ee KTeV 1997 data:2 events consistent with the expected background of1.06 ± 0.41 events
August 11, 2003 LP2003, Augusto Ceccucci 8
KTeV: KL→ 0eeKL→eecrossing the signal box (BR~6 10-7 !!)
KL→000D,
e+0acc
DATA 1999preliminary
KL →000, e+acc
e+X e-X X
M(ee) computed using the neutral vertex, assuming m(=m(0) M() computed from charged vertex
August 11, 2003 LP2003, Augusto Ceccucci 9
KTeV: 0ee vs ee kinematics
Minimum angle between any e and
KL →ee “radiative”distribution
0 → “isotropic”distribution
cos0
0 → decay asymmetry
Expected background:
0.99 ± 0.33 events
August 11, 2003 LP2003, Augusto Ceccucci 10
KTeV: KL→ 0ee
• One candidate in the signal box
• Combining 1997 and 1999:
1999 data, preliminary
BR(KL → 0 ee ) < 3.5 × 10-10 @90%CL
BR(KL → 0 ee ) < 2.8 × 10-10 @90%CL
August 11, 2003 LP2003, Augusto Ceccucci 11
NA48/1 (CERN)
• NA48: ’/ , KL rare decays• NA48/1: KS rare decays
•Upgraded read out•High intensity short neutral beam from the CERN-SPS•Run in 2000 (only s) and 2002
Run 2002 NA48 (’/ ):•1997-1999•(2000)•2001
Liquid krypton calorimeter
August 11, 2003 LP2003, Augusto Ceccucci 12
NA48/1: KS →0 ee
e+-e-+ (Odd Sign) DATA e+-e-+ DATA vs. MC
Blind Control& Signal regions
mee > 0.165 GeV/c2 cut applied to reject KS → 0 0D with one missing
mee (GeV/c2)
me
e
(G
eV/c
2)
August 11, 2003 LP2003, Augusto Ceccucci 13
NA48/1: KS →0 ee
e+-e+- (Same Sign) DATAe+-e+- DATA vs. MC
Search region
me
e
(G
eV/c
2)
mee (GeV/c2)
August 11, 2003 LP2003, Augusto Ceccucci 14
NA48/1: KS →0 ee
Background from KL,S→ee : measured using NA48 KL data from 2001N(KL→ee, 2001) 10 × N(KL,S →ee, 2002)
mGeV/c2)
me
e
(GeV
/c2)
August 11, 2003 LP2003, Augusto Ceccucci 15
NA48/1: KS →0 ee
• DC proton beam• Read out window: ~ 200ns• Use time side band to
measure background from time-overlapping fragments from differ decays
• Major component:– e+ 00(0)– Confirmed relaxing E/P
cuts m (GeV/c2)
Accidental backgrounds
me
e
(G
eV/c
2)
August 11, 2003 LP2003, Augusto Ceccucci 16
NA48/1: KS →0 ee
Source Control Region
Signal region
KS→0D0
D 0.03 0.007
KL,S → ee 0.11 0.075
e+20(0) 0.19 0.069
Total 0.33+0.18-0.11 0.15+0.05
-0.04• Many other sources investigated and found to be negligible (e,g neutral cascade decays)
• Blind analysis: Control and signal region remained masked until the study of the background was finished
SUMMARY OF BACKGROUNDS:
August 11, 2003 LP2003, Augusto Ceccucci 17
NA48/1: KS →0 ee
•7 candidates in the signal region
•0 in control region•Background 0.15
The probability that all 7events are background is ~10-10
me
e
(G
eV/c
2)
m (GeV/c2)
First observation of KS →0 ee
August 11, 2003 LP2003, Augusto Ceccucci 18
The 7 KS→0ee candidates
Mee (GeV/c2)
M (GeV/c2)
t/S
Mee (GeV/c2)
August 11, 2003 LP2003, Augusto Ceccucci 19
NA48/1: KS →0 ee
BR(KS→0ee, mee>165 MeV/c2) = (3.0+1.5-1.2(stat) ± 0.2(syst))×10-9
• Assuming vector interaction and unity form factor:
– In remarkable agreement with L. Sehgal prediction: ~5.5 ×10-9 NP B19 (1970) – In the notation of D’Ambrosio et al. JHEP 08 (1998 004):
– BR(KS→0ee) ~ 5 |as|2
|as|=1.08+0.26-0.21
BR(KS→0ee) = (5.8 +2.8-2.3(stat) ± 0.3(syst) ± 0.8(theor))×10-9
Preliminary
August 11, 2003 LP2003, Augusto Ceccucci 20
Sensitivity to Im t
20 12 2
4 4
Im( ) Im( )( ) 10 15.3 6.8 2.8
10 10t t
L CPV s sB K e e a a
IF the interference is constructive some sensitivity to Im t is retained
-as
August 11, 2003 LP2003, Augusto Ceccucci 21
KL→ee() Perspectives
• Detector ×2 – Very ambitious, KTeV already state of the art
• KS-KL time dependent interference ×2– Position experiment between 9 and 16 KS lifetimes (hep-ph/0107046)
• KS-KL time independent interference ×3 – Assume constructive interference (theoretically preferred)
• Data Taking ×5 – Run in “factory mode”. After all E799-II run only for a few months to
collect ~7 × 1011 KL decays• Beam intensity ×4
– Need ~1012 protons/sec, slowly extracted, high energy, DC • Tot ~ ×240 → sens~ ×15
– close the gap between current upper limit and SM• Where? When?
*Admittedly aggressive Road Map*
Expect KTeV to update KL→ (1999 data) NA48/1 analysis of KS→ is in progress
August 11, 2003 LP2003, Augusto Ceccucci 22
As an example, within the SM, using ACP(J/KS) and k as input:
BR(K+ → ) = 7.1 ± 1.0 × 10-10
(Kettell, Nguyen, Landsberg, hep-ph/0212321 )
K+→+ (reminder)
220
411
2242
32
)(109.8
||||sin2
)()(
A
XXV
KBKB
lcctt
usW
eSD
•The hadronic matrix element can be extracted from the well measured K+→ 0 e •No long distance contributions
QCD NLOBuchalla,Buras 1999
August 11, 2003 LP2003, Augusto Ceccucci 23
K+→+
Region I211 < P < 229 MeV/c
Region II 150 < P < 195 MeV/c
+ in the K+ CM
August 11, 2003 LP2003, Augusto Ceccucci 24
Data 1995-1998Pub.1997-2002
•Stopped kaons (~6 ×1012)•Analysis of Region I: 2 events
background: 0.15 ± 0.05
AGS-E787 K+→+ Region I
BR(K+ → + , Region I) = 1.57+1.75
-0.83 × 10-10
0.29 < | t |/10-3 < 1.2 68% CL
PRL 88 2002
August 11, 2003 LP2003, Augusto Ceccucci 25
E787- K+→+ Region II
• 1997 (preliminary)– No new events– Background 0.5 ± 0.2
1996 data1997 dataNEW RESULT!
• 1996– One event found – Background 0.7 ± 0.2
BR(K+ → + , Region II ) < 22 × 10-10 @90%CL
PLB 537 2002
August 11, 2003 LP2003, Augusto Ceccucci 26
K+→+ E949
• Successor of E787– Many improvements– Better photon vetoes
• Run 12 weeks in 2002:– Expect Region I result soon – Expect much better sensitivity
than E787 in Region II– Expect from data 2002 an
overall sensitivity comparable to E787
• Approved for 60 weeks – When will the next run take
place?
August 11, 2003 LP2003, Augusto Ceccucci 27
Current Status
STILL A LARGE WINDOW OF OPPORTUNITY EXISTS
G. Isidori
August 11, 2003 LP2003, Augusto Ceccucci 28
KTeV: KL→ ee
• CPV asymmetry from the interference of IB and DE diagrams in K→ +-
• BR~3 ×10-7
• CPV asymmetry and form factors from full statistics
(5056 events)
AL= (13.3 ± 1.4 ± 1.0)% (Theory: ~14%, Sehgal et al.)• Form Factors (preliminary):
– a1/a2 = -0.75 ± 0.03 ± 0.02
– gM1 = 1.10 ± 0.10 ± 0.06
sincos
(1997+1999, preliminary):
KTeV KL
NA48 KS
August 11, 2003 LP2003, Augusto Ceccucci 29
NA48/1: KS → 30
• Near Beam– NA48/1 (2000) ~6.5 106 30
• Far Beam:– NA48 2000 > 107 KL→30
– To normalise the acceptance
• Analysis in bins of energy
000 000 00
1( )2 ( 2
0
)
( , )
( ) 1 2 ( ) cos sinRe ImL SL S
tt
NEARf E t
FARA E e D E e mt mt
0
000 0
( 3 )
( 3 )S
L
A K
A K
CP-Violating
In SM 000~
D(E) is the K0 K0 dilution (from NA31)
August 11, 2003 LP2003, Augusto Ceccucci 30
NA48/1: KS → 3
From one parameter fit:BR(KS→30) < 3.0 × 10-7 90%CL BRSM ~ 3 × 10-9
From the 2 parameter fit,using BS unitarity relation:
Im CPT = (-1.2 ± 3.0) × 10-5
Assuming CPT conservation in decay:M(K0) –M(K0) = (- 1.7 ± 4.2) × 10-19 GeV/c2
Im
000
Re 000
CPT TEST: KL ~ (+CPT)K1 + K2
KS ~ K1 + (-CPT)K2
August 11, 2003 LP2003, Augusto Ceccucci 31
KLOE (LNF)
2002
2001
2000
Days of running
Inte
gra
ted
lu
min
osi
ty (
pb-1
)
DANE Factory:e+e- → → KSKL (K+K-)
Tagged KS and KL
August 11, 2003 LP2003, Augusto Ceccucci 32
KLOE: KS →e
KLOE Preliminary (2001 data):
BR(-e+) = (3.44 ± 0.09stat ± 0.06syst) × 10-4
BR(+e-) = (3.31 ± 0.08stat ± 0.05syst) × 10-4
BR(e ) = (6.76 ± 0.12stat ± 0.10syst) × 10-4
August 11, 2003 LP2003, Augusto Ceccucci 33
KLOE: KS → e
CPT testFirst ever measurement:
A(KS) = (1.9±1.7±0.6) ×10-2
c.f. KL w.a.
A(KL) = (3.322 ± 0.055) ×10-3
S=Q testRe (x+) = (2.2 ± 5.3 ± 3.5) ×10-3
c.f. CPLEAR
Re (x+) = (-1.8 ± 4.1 ± 4.5) ×10-3
Semileptonic asymmetries (preliminary)
PLB 535 (2002)
August 11, 2003 LP2003, Augusto Ceccucci 34
Kaon Dalitz decays: Motivation
• Allow to study the K-**) form factors • These form factors are related to the dispersive amplitude of
KL→ which is not under good control • Short distance contributions to KL→ are sensitive to Re t
TWO MODELS:• BMS (Bergström, Massó, Singer, 1983)
– Pseudoscalar/vector contributions: K*
• DIP (D’Ambrosio, Isidori, Portoles, 1997)
2 2 2 22 2 1 2 1 21 2 2 2 2 2 2 2 2 2
1 2 1 2
( , ) 1( )( )DIP
q q q qf q q
q m q m q m q m
*1 (3.1 0.5) K
August 11, 2003 LP2003, Augusto Ceccucci 35
KTeV: KL→ ee• In the 1997 data, KTeV has
identified 93,383 KL→ee over a background of less than 0.1%
• To determine the acceptance it is very Important to understand the tracking for close pairs
• Uncertainty dominated by the error on the normalisation mode:
KL→00D0
D with 0D →ee
BR(KL→ee)×106 = 10.19 ± 0.04(stat) ± 0.07(syst) ± 0.29(norm)
K3
Employ TRD to reduce background
Preliminary
Ke3 ee
August 11, 2003 LP2003, Augusto Ceccucci 36
KTeV: KL→ ee
K*= -0.186 ± 0.011 ± 0.009
K*=0.20
K*=-0.16
K*=0.0
K*=-0.36
Measured to ~7%Precision!
August 11, 2003 LP2003, Augusto Ceccucci 37
KTeV: KL→ ee ee
– Signal ~1100 events – Background: 5 events (mainly due to KL→ee+ conv)– Normalisation: KL → 00
D0D
BR(KL → ee ee) = (4.16 ± 0.13 ± 0.13 ± 0.17) ×10-8
K* = -0.03 ± 0.13 ± 0.04
1997+1999 Data (preliminary)
Theory:~3.5 10-8
August 11, 2003 LP2003, Augusto Ceccucci 38
DATA 1997+1999
•Signal: 132 events•Background ~0.8 event (KL → +- )
PRL 90 (2003)
KTeV: KL→ ee
BR(KL → +- e+e-)=(2.69 ± 0.24 ± 0.12)×10-9
BR(KL → -+ -+e+- e+-) < 4.12 × 10-11 90%CLLFV
August 11, 2003 LP2003, Augusto Ceccucci 39
KTeV KL→ ee
Combining KL → , KL → 4e, and KL→ee,
KTeV measures:
(DIP) = -1.53 ± 0.10
K*(ee)= -0.19 ± 0.11
August 11, 2003 LP2003, Augusto Ceccucci 40
K-(*)* Form Factor
K *
~2.6
August 11, 2003 LP2003, Augusto Ceccucci 41
KLOE: KL→
• Data 2001-2002• 362 pb-1, 109 • KL tagged by KS→+-
– 1.6 ×108 KL
– KL → 30 suppressed requiring 2 body kinematics
• 27375 KL→ • PL B556 2003
(KL ) / (KL ) = (2.79 ± 0.02stat ± 0.02syst) 10-3
In good agreement with the NA48 result (PL B551 2003):
(KL ) / (KL ) = (2.81 ± 0.01stat ± 0.02syst) 10-3
August 11, 2003 LP2003, Augusto Ceccucci 42
NA48/1: KS γ
BR ( KS γγ ) = (2.78 ± 0.06stat ± 0.03syst ± 0.02ext )×10-6
PLB 551 (2003)
August 11, 2003 LP2003, Augusto Ceccucci 43
KS γγ measurements
The NA48/1 result has an accuracy better than 3%
It differs by 30% from O(p4) prediction of CHPT
Used to fix one O(p6) counterterm:
8mK2/F
2 a1 = 1 ± 0.3
BDI (hep-ph/0308008)NA48/1
PL B551 2003
O(p4)
2.78 ± 0.07
August 11, 2003 LP2003, Augusto Ceccucci 44
NA48/1: KS PRELIMINARY: first observation
BR(KS γγ, zq0.2 ) = (4.9 ± 1.6stat ± 0.8syst )×10-8
CHPT predicts (Ecker, Pich and PLB 189 1987): BR(KS ) zq > 0.2 =3.8 10 –8
Zq=q2/MK2
August 11, 2003 LP2003, Augusto Ceccucci 45
NA48/2 and OKA: K+/K-
*NA48/2 is taking data*•Search for direct CP violation in Dalitz plot slope asymmetry in K± decay• Ke4 decays• Rare K± decays
Simultaneous K+ and K- beams
NA48/2Very Preliminary
K± → ± ee
Similar sensitivities expected from OKA @Protvino (2004?)
August 11, 2003 LP2003, Augusto Ceccucci 46
CKM@FNAL-MI (2009?)
•Proposal to measure ~100 K+→+ in flight •Make redundant measurements: spectrometer and RICH
–Built full size prototype of SCRF for 22 GeV/c separated beam–Measured inefficiency of photon vetoes @1GeV to be 5×10-6
•×6 better than needed–Demonstrated operation in vacuum of straw tubes
•Awaiting approval ratification by P5
August 11, 2003 LP2003, Augusto Ceccucci 47
E391a@PS-KEK
•First dedicated experiment to search for KL→ •SES~ 3 10-10
•Based on pencil kaon beam and photon vetoesScheduled for ~100 days KEK PS beam in 2004 This is a Stage I project for further study at J-PARC
August 11, 2003 LP2003, Augusto Ceccucci 48
KOPIO@BNL (2009?)
• Aim to collect 60 KL→ events with S/B~2 (Im t to 15%)• Measure as much as possible
– Energy, Position and Angle for each photon
• Work in the Kaon Center of Mass – Micro-bunched AGS beam– Use TOF to measure KL momentum
• Start construction in 2005?
August 11, 2003 LP2003, Augusto Ceccucci 49
High Energy Frontier
Rare Processes
Conclusions
•The field of kaon rare decays is quite active •New experimental initiatives are planned•Significant tests of the SM are to be expected by the end of the decade
August 11, 2003 LP2003, Augusto Ceccucci 50
Spare Material
August 11, 2003 LP2003, Augusto Ceccucci 51
NA48: KL,S→ee
August 11, 2003 LP2003, Augusto Ceccucci 52
CP-Violation in SM
'
'
'
ub
cb
td
ud us
cd cs
ts tb
V
V
V V
d d
s s
b b
V
V
V
V V
, , , ,
* *ij ik ji ki jki u c t i u c t
V V V V
JCP=2(Triangle Area) Is the unique measure of CP-Violation in SM
Ng=2 Nphase=0 No CP-Violation
Ng=3 Nphase=1 CP-Violation Possible
A phase in the quark-quark current leads to CP-Violation (Kobayashi, Maskawa, 1973)
6 unitarity relations( triangles in the complex plane)
* * *Im( ) Im( ) ~ sin cos Im( ) CP ud us ts td u t c c tJ V V V V
August 11, 2003 LP2003, Augusto Ceccucci 53
Consistency of CKM picture• Paradigm shift:
– Old question: (before the ’/ and B→J/ Ks asymmetry measurements):
• Is CKM the source of CP-violation?
– New question:• Is CKM the only source of CP-violation?
• Decisive tests must have small theoretical errors– The opportunity is to compare information
from K rare decays and B mesons
August 11, 2003 LP2003, Augusto Ceccucci 54
Kaon Dalitz decays: MotivationShort distance contributions to KL → sensitive to Re t
Long distance contributions:
20
492242
22
)(1051.1|ReRe|||sin
)()(
AYYV
KBKB ttcc
usWK
KLSD
L
•Absorptive part (Im A) is dominant (2 real photons) •Dispersive part (Re A) depends on the K-**) form factors that can be studied with the Dalitz decays:
•Is much less under control•Can interfere with the SD piece
Buchalla & Buras 1994
August 11, 2003 LP2003, Augusto Ceccucci 55
Form Factors K**
• BMS (Bergström, Massó, Singer, 1983)
42
*2
2 2 2( ,0) 1 (1 3.1 ) (( ) / )KBMS
qf q O q m
m
• DIP (D’Ambrosio, Isidori, Portoles, 1997)
2 2 2 22 2 1 2 1 21 2 2 2 2 2 2 2 2 2
1 2 1 2
( , ) 1( )( )DIP
q q q qf q q
q m q m q m q m
*1 (3.1 0.5) K
August 11, 2003 LP2003, Augusto Ceccucci 56
KL → 0 (reminder)
•Theoretical error ~2%:•Purely CP-Violating (Littenberg, 1989) •Totally dominated from t-quark•Computed to NLO in QCD (e.g. Buchalla Buras, 1999)•No long distance contribution SM~3 × 10-11
• Experimentally: 2/3 invisible final state !!• Best limit from KTeV using →ee decay
BR(K0 → 0) < 5.9 × 10-7 90% CL
Still far from the model independent limit: BR(K0 → 0) < 4.4 × BR(K+ → +) ~7 × 10-9 Grossman & Nir, PL B407 (1997)
August 11, 2003 LP2003, Augusto Ceccucci 57
NA48: KL→• Data 2000
– sub-sample of KL data
• Background:– Hadronic origin– 0.6 ± 0.3 %
• Main systematics:– calorimeter response
for the acceptance calculation
(KL ) / (KL ) = (2.81 ± 0.01stat ± 0.02syst) 10-3
4 times better precision than PDG: (2.77 ± 0.08) 10-3
August 11, 2003 LP2003, Augusto Ceccucci 58
Older NA48 measurement of KS γγ branching ratio based on 2 days of test-run in 1999 with high intensity KS : (2.6 ± 0.4) 10 –6 PLB 493 (2000)
NA48/1 KS γγ Decays into neutral final states : O(p2) = 0
• O(p4) unambiguosly predicted by ChPT loop diagram to better than 5% without counter terms: Theory: BR(KS→ , O(p4))=2.1 10-6
No indication of O(p6) contributions
August 11, 2003 LP2003, Augusto Ceccucci 59
NA48/1: KS → 0 ee
• To reject the KS → 0 0D decays that may mimic KS →0 ee if
a is lost, a cut mee>0.165 GeV/c2 is applied
KS →0 ee KS → 0 0D→ee()
MCMC
August 11, 2003 LP2003, Augusto Ceccucci 60
NA48/1: KS Previous limit (NA48):
BR(KS , zq > 0.2 ) < 3.310 –7 at 90% CL
ChPT predicts (Ecker, Pich, De Rafael - PLB 189 (1987)):
BR(KS ) zq > 0.2 =3.810 –8
momentum dependence
of the weak vertex Chiral structure of the weak vertex can be tested from zq = (m34 /mK)2 distribution
August 11, 2003 LP2003, Augusto Ceccucci 61
OKA @ Protvino - K
New RF-separated beam at U-70 PS in construction15 GeV/c kaons, alternating K+ or K-
Magnetic detector evolved from ISTRA+, GAMSIn preparation, expected 2004Measurement of 3 Dalitz plot asymmetries @ 1 10-4
T-odd correlations, search for New Physics in Kl2 decays
August 11, 2003 LP2003, Augusto Ceccucci 62
CKM@FNAL-MI (2009)
• SCRF 13 cell cavity – Built full size prototype
• Photon vetoes– Measured inefficiency
for 1GeV : 5×10-6 – ×6 better than needed
• Straw tubes– Demonstrated
operation in vacuum – Same preformance as
in air• Simulation of
“triggerless DAQ”• Awaiting approval
ratification by P5
From CKM proposal
August 11, 2003 LP2003, Augusto Ceccucci 63
OKA @ Protvino - K
New RF-separated beam at U-70 PS in construction15 GeV/c kaons, alternating K+ or K-
Magnetic detector evolved from ISTRA+, GAMSIn preparation, expected 2004Measurement of 3 Dalitz plot asymmetries @ 1 10-4
T-odd correlations, search for New Physics in Kl2 decays
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