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Warm-upIntroduction of Belle CKM Analyses
Toru Iijima (Belle) / Nagoya
2nd Informal Vub Mini-Workshop @ Nagoya, May 30-31, 2002
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
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
May 30, 2002 “Warm-up, Introduction to Belle CKM analyses” by T.Iijima, @ 2nd Vub mini-workshop
Present sin21 status
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
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
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…
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
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)
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)
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
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
