Warm-up Introduction of Belle CKM Analyses
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Transcript of Warm-up Introduction of Belle CKM Analyses
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Warm-upIntroduction of Belle CKM Analyses
Toru Iijima (Belle) / Nagoya
2nd Informal Vub Mini-Workshop @ Nagoya, May 30-31, 2002
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May 30, 2002 “Warm-up, Introduction to Belle CKM analyses” by T.Iijima, @ 2nd Vub mini-workshop
Recent update of CP in B0 Decays
Moriond ’02
Belle sin21 at 41.8 fb-1
= 0.82±0.12(stat.)±0.05(syst. )w/ 1550 events
More than 6deviation from 0 !
( ) ( )( ) ( ) mtsin2sin-
fBfB
fB-fB)t(A 1f
CP0dCP
0d
CP0dCP
0d
CP
=→+→
→→≡
B
B fcp
e-2i1 A
A
0.99±0.14±0.06 @ 29.1fb-1 (LP01) w/1137 events
LP01
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May 30, 2002 “Warm-up, Introduction to Belle CKM analyses” by T.Iijima, @ 2nd Vub mini-workshop
Belle sin21 w/ 41.8 fb-1
1.14 0.220.24
0.69 0.150.16
CP-1
CP+1
Statistical error only
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May 30, 2002 “Warm-up, Introduction to Belle CKM analyses” by T.Iijima, @ 2nd Vub mini-workshop
Present sin21 status
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May 30, 2002 “Warm-up, Introduction to Belle CKM analyses” by T.Iijima, @ 2nd Vub mini-workshop
Recent Vub UpdatesCLEO: end-point analysis + b→sshape function (hep-ex/0202019)
BaBar/Belle exclusiveBaBar (l)
Belle (l)
CLEO(l)
exp bu HQEbbc
stat sys mod
stat fu HQE1/mb
3(4.08 0.34 0.44 0.16 0.24) 10Vub
0.36 0.42 0.24 30.39 0.47 0.26(4.09 0.01 0.17) 10Vub
LEP HF Working Group:
0.33 30.38(3.57 0.36 0.60) 10Vub
3(3.50 0.20 0.28) 10Vub w/ ISGW2
0.21 30.29(3.25 0.14 0.55) 10Vub
Moriond’02
DPFPrel
iminary
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May 30, 2002 “Warm-up, Introduction to Belle CKM analyses” by T.Iijima, @ 2nd Vub mini-workshop
Revival of Inclusive Measurements
Measurements of parameters in theory calculation
⇒Better determination of Vcb, Vub w/ inclusive decays.
–0.4
–0.3
–0.2
0
–0.5
0.1
–0.1
1
b→smoment
bc inclusive: Mx moment
E 2 2E E
2 2X DM M
Vcb
Vub
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May 30, 2002 “Warm-up, Introduction to Belle CKM analyses” by T.Iijima, @ 2nd Vub mini-workshop
Evidence of Ds
BaBar @ Moriond ‘02
14.9 4.1 events DD
Systematic error mostly from uncertainty on BF of secondary decays, peaking background uncertainty, selection criteria
BF( B Ds )(*) = ( 3.1 1.0 1.0 ) 105
BF( B Ds ) BF(Ds
) = ( 1.11 0.37 0.24 ) 106
BF( B Ds )(*) = ( 3.1 1.0 1.0 ) 105
BF( B Ds ) BF(Ds
) = ( 1.11 0.37 0.24 ) 106
(*) 25% uncertainty from PDG BF(Ds )
significance of the signal = 3.5
Evidence of reflected Ds
D background
PreliminaryPreliminary
How about Belle’s status Talk tomorrow…
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May 30, 2002 “Warm-up, Introduction to Belle CKM analyses” by T.Iijima, @ 2nd Vub mini-workshop
Present CKM Constraint
|Vcb*Vcd|~0.0092
Standard Constraints
(not including sin2)
Standard Constraints
(not including sin2)
A.Hocker@FPCP
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May 30, 2002 “Warm-up, Introduction to Belle CKM analyses” by T.Iijima, @ 2nd Vub mini-workshop
Luminosity at KEKB…
Lpeak = 7.249 ×1033cm-2s-1
Lday = 387 pb-1
Lint = 80.7fb-1
6.617339.257.2 at the time of 1st WS.
( PEP-II/BaBar:88.36fb-1)
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May 30, 2002 “Warm-up, Introduction to Belle CKM analyses” by T.Iijima, @ 2nd Vub mini-workshop
Belle CKM AnalysisCKM analysis group conveners: Y.Kwon, T.IijimaVcb related subjects
D+ l (J.W.Nam, SKKU)D* l (H.K.Jang, SNU)Lepton inclusive (K.Yoshida, Nagoya)
Vub related subjectsInclusive semileptonic decays
• End-point analysis (A.Limosani, Melborune)• Mx (q2) measurement with Full recon tag. (Slovenia ++ others)
Neutrino recon tag. (H.Kakuno, TIT)
D(*) l tag. (A.Sugiyama, Nagoya)Exclusive semileptonic decays ( l , l )
• Heejong Kim (Yonsei), J.W.Nam(SKKU), C.Schwanda(KEK), M.Gobinda(Tata), … Hadronic decays Ds (D.W.Kim, SKKU)
Ds Xu w/ pseudo recon. (C.Everton, Melborune)Ds inclusive (Y.Mikami, Tohoku)
Leptonic decays (B l )• B e , m (H.W.Kim, Korea)• B (Liventsev, ITEP)
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May 30, 2002 “Warm-up, Introduction to Belle CKM analyses” by T.Iijima, @ 2nd Vub mini-workshop
Purpose of mini-Workshop
Enhance discussion with theorists.for experimentalists, learn about theoretical aspectsfor theorists, learn about experimental issues
Better idea
Make clear the present achievement:signal-to-noise, efficiency#events / fb-1Experimental errors (statistical and systematics)
Extrapolate to 100fb-1/300fb-1..., and make clear theprospect toward Summer 2002 and beyond..Discuss how to extract Vub from the measurement, and how to treat the error.List up whatever you want to discuss with theorists.Others
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May 30, 2002 “Warm-up, Introduction to Belle CKM analyses” by T.Iijima, @ 2nd Vub mini-workshop
Notes
We ask each speaker to provide 1-2 page summary.
All slides will be posted on Web
computer files: send it to [email protected]
hard copy: give them to a student for scan
This building is locked in the nightAsk a Nagoya staff/student how to enter (4 digit key code)
Terminal: limited number of terminal available.Ask a Nagoya staff/student
We will have a BBQ party (18:30~)
Staff: \2,000 / Student: \1,000