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Rare B Decays at Belle Hsuan-Cheng Huang ( 黃宣誠 ) National Taiwan University 2 nd BCP NTU, Taipei June 7 - 9, 2002.

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Presentation on theme: "Rare B Decays at Belle Hsuan-Cheng Huang ( 黃宣誠 ) National Taiwan University 2 nd BCP NTU, Taipei June 7 - 9, 2002."— Presentation transcript:

1 Rare B Decays at Belle Hsuan-Cheng Huang ( 黃宣誠 ) National Taiwan University 2 nd BCP Workshop @ NTU, Taipei June 7 - 9, 2002

2 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.2) Outline Introduction Charmless Hadronic B Decays Charmless Baryonic B Decays Radiative / EW Penguin B Decays Suppressed b -> c Decays Summary

3 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.3) Introduction Rare B decays can be described by various tree and penguin diagrams They are useful to determine the CKM unitarity triangle Search for CP violation and probe new physics

4 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.4) Belle Collaboration A World-Wide Activity Involving 50 Institutions 14 Nations

5 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.5) Belle Collaboration ~ 300 authors

6 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.6) KEK View 日本 茨城県 つくば市

7 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.7) 8GeV electron3.5GeV positron  (4s) (10.58GeV/c2)  = 0.425  (4s)  B B KEKB Collider KEKB Asymmetric e + e - Collider

8 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.8) KEKB Luminosity: the world’s best ! Peak L 7.25  10 33 cm -2 s -1 (Mar. 28, ’02) Daily Integrated L 387 pb -1 /day(May 11, ’02) Weekly Integrated L 2.52 fb -1 /week(May 9, ’02) Peak L 7.25  10 33 cm -2 s -1 (Mar. 28, ’02) Daily Integrated L 387 pb -1 /day(May 11, ’02) Weekly Integrated L 2.52 fb -1 /week(May 9, ’02) 82 fb -1 recorded (Jun. 6, ’02) 82 fb -1 recorded (Jun. 6, ’02) Daily Integrated luminosity history Integrated luminosity history 43 fb -1 29 fb -1

9 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.9) Silicon Vertex Detector (SVD) Impact parameter resolution  55  m for p=1GeV/c at normal incidence Central Drift Chamber (CDC) (  Pt/Pt)2 = (0.0019Pt)2 + (0.0034)2 Pt in GeV/c2 K/  separation with dE/dx in CDC (  dE/dx =6.9%) TOF (  TOF = 95ps) Aerogel Cerenkov (ACC) Efficiency = ~87%, Fake rate = ~8% up to 3.5GeV/c , e  with CsI crystals (ECL)  E/E ~ 1.8% @ E=1GeV e  : efficiency > 90% (~0.3% fake for p > 1GeV/c) KL and  with KLM (RPC chambers)  : efficiency > 90% (~2% fake at p > 1GeV/c) Quite stable performance up to now ACC Kaon efficiency  contamination 87% 8% PID(K)>0.6 Belle Detector

10 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.10) Signals Analysis Method Identify Signals: beam-constrained mass M bc and energy difference  E

11 7-Jun-2002 NTHU Seminar Hsuan-Cheng HuangRare B Meson Decays at Belle (p.11) B  hh: Introduction

12 7-Jun-2002 NTHU Seminar Hsuan-Cheng HuangRare B Meson Decays at Belle (p.12) K+-K+- K+0K+0 K0+K0+ K00K00 +-+- +0+0 0000 B  hh: Results Updated measurements with 31.7M BB  mass is assigned to charged tracks Likelihood ratio cut optimized for each mode Shaded area corresponds to background from other rare B decays ⇒ Better fitting systematics  0  0 Hint ⇒ Feedback to  2 measurement Preliminary 29 fb -1

13 7-Jun-2002 NTHU Seminar Hsuan-Cheng HuangRare B Meson Decays at Belle (p.13) B  hh: Branching Fractions  0  0 Hint No KK yet! Preliminary BaBar 55.6 fb -1 * * * 20.6 fb -1 Bartoldus @ FPCP

14 7-Jun-2002 NTHU Seminar Hsuan-Cheng HuangRare B Meson Decays at Belle (p.14) B  hh: Direct CP Search Preliminary K+-K+- K-+K-+ K+0K+0 K-0K-0 +0+0 -0-0 K0-K0- K0+K0+ quark Fluctuation? BaBar 55.6 fb -1

15 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.15) B   ( ‘ ) h: Introduction

16 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.16) Results of B   K* /  ’K 9 8 29 fb -1

17 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.17) B   K Results Preliminary

18 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.18) B   Results Preliminary

19 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.19) B   ( ‘ ) h: Summary Preliminary

20 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.20) B   h: Introduction

21 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.21) B   h: Results Preliminary

22 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.22) B   h: Consistency Check

23 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.23) B   h: Summary Preliminary

24 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.24) B  Khh Dalitz  Sizable PRD 65 092005 (2002) Three-Body Charmless B Decays First Observations of

25 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.25) B -> K h h’ A. Garmash @ FPCP *PRD 65 092005 (2002) ** H.C.Huang@Moriond 02 EW Preliminary

26 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.26) Pseudo-Two-Body Decay BFs B +  K +  +  - B +  K + K + K - B +  K S K + K - B +  K S  +  - PRD 65 092005 (2002) Preliminary 29 fb -1 43 fb -1 Gabyshev @ DPF2002

27 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.27) Charmless B Decays to Baryons PRD 65, 091103 R (2002)

28 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.28) First Observation of Charmless Baryonic B Decays

29 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.29) 3-body Baryonic B Decays, cont. Chua, Hou, Tsai hep-ph/0204186 f J (2220)? Chua, Hou & Soni, PRL 86, 4247 (2001) J/ 

30 7-Jun-2002 BCP Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.30) EM Starting to Constrain NP Radiative B Decays Preliminary PRL 88, 101805 (2002) BaBar ( 20.6 fb -1 )

31 7-Jun-2002 BCP Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.31)  UL PLB’01 More Radiative Penguins 45M BB Exclusive (K , K  ) / Inclusive = (35 ± 8) % hep-ex/0205025, submitted to PRL

32 7-Jun-2002 BCP Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.32) Signal ! First Obseervation of ElectroWeak Penguin !? PRL 88 021801 (2002) But, BaBar 20.7 fb -1 FPCP 56.4 fb -1

33 7-Jun-2002 BCP Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.33) Inclusive B -> X s l + l - X s = (K + or K S ) + (0 ~ 4)  + (upto 1  0 ) First Evidence! Senyo@FPCP 43 fb -1 Preliminary

34 7-Jun-2002 BCP Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.34) Inclusive B -> X s l + l - With higher statistics, more information will be obtained from M(Xs) and M(ll) distributions J/psi and psi’ vetoes K K* M Xs Distribution M ll Distribution MC based on the NNLO calculation Ali-Lunghi-Greub-Hiller, hep-ph/0112300

35 7-Jun-2002 BCP2 Workshop Hsuan-Cheng HuangRare B Meson Decays at Belle (p.35) Summary Recent Rare B Results from Belle have been presented First Observations: B  ppK ±, Khh, Kll, K  First Evidence: B   ±,  K ±, X s ll “Re”-Observation: B ±   K ± Improved Measurement: B  K , , K*  More and more interesting results are coming  80fb -1 @ ICHEP2002

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