1 Branching Fraction and Properties of B meson Decays to Charmonium Y. Watanabe Tokyo Institute of Technology For the Belle Collaboration.

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Presentation transcript:

1 Branching Fraction and Properties of B meson Decays to Charmonium Y. Watanabe Tokyo Institute of Technology For the Belle Collaboration

2 1. Introduction KEKB and Belle Interest in 2. Search for Missing Charmonium states 3. Search for factorization-forbidden decays 4. Additional CP eigenstates (Cabibbo favored): Contents

3 Contents (2) 5. Additional CP eigenstates (Cabibbo suppressed) : 6. Branching Fractions of Exclusive Decays 7. Summary

4 1 Introduction Luminosity vs. Energy of e + e - colliders Center of mass energy (GeV) Luminosity (cm -2 s -1 ) KEKB

5 1 Introduction (2) Accelerator-Detectors at Luminosity Frontier as of summer 2002 Peak lum. Integrated Lum. Start of (10 33 cm -2 s -1 ) (fb -1 d -1 ) (fb -1 ) operation KEKB - Belle May PEP-II - BaBar Oct. CESR - CLEO ～

6 KEKB Asymmetric Energy e + e - collider (crucial for CP measurement) at Υ(4S) region (10.58GeV) e - : 8.0 GeV, 1.1A e + : 3.5 GeV, 2.6A finite angle crossing ±11mr World Highest Luminosity Design = cm -2 s -1 1 Introduction (3) Belle

7 1 Introduction (4) Luminosity at KEKB-Belle Luminosity/day Integrated Luminosity (fb -1 /day) (fb -1 ) Improved drastically 89.6 fb -1

8 1 Introduction (5) Belle detector Good Vertex Detection Good Particle ID Belle collaboration ～ 300 researchers (55 Institutes) from Australia, Austria, China, Germany, India, Japan, Korea, Philippines, Poland, Russia, Slovenia, Switzerland, Taiwan and USA

9 1 Introduction Belle and Logo Asymmetric e + e - collider producing B

10 1 Introduction (6) Interest in B decays to charmonium 1) Golden channels for CP Measurements: 2) Best place to look for missing charmonium states such as η C (2S) 3) Clean testing ground of Theoretical Ideas (QCD, NRQCD, HQET) charmonium states = singlet in color, isospin and SU(3) quantities 4) Fundamental Quantities Branching fractions, etc.

11 1) Most of analyses are based on data of (1/3 of data taken) 2) Number of events 1 Introduction (7) Fundamentals of Analyses Reconstructable Final state 3) Signals: look for peaks in:

12 2 Search for missing States Charmonium Levels By Crystal Ball collab. (PRL48, 70, 1982) unconfirmed Missing so far

13 2 Search for missing States (2) Transitions among Charmonium Levels Found this time hadrons

14 2 Search for missing States (3) First Observation of η C (2S) (PRL to be published) B signals found in

15 η C (2S) (cont ’ d) Mass (MeV/c 2 ) (MeV) Belle 3654±6 ± 8 <55 Crystal Ball 3594 ±5 <8 Theory 3635 ±10 8.3±1.3 ( PRD24,132(81), Fermilab-Pub02/104-T) 2 Search for missing States (4) ( substantial !) η C (2S) #total=64 #Bgd =21±2

16 3 Factorization-Forbidden Decays Factorization

17 3 Factorization-Forbidden Decays QCD expectation Na ï ve Factorization Hypothesis: charmonium ・・・

18 3 Factorization-Forbidden Decays (2) Decay B → χ C2 (3556) X found. (PRL to be published) enhance Events look for

19 B → χ C2 (3556) X cont ’ d Momentum spectra: little events at end point for compared to essentially no (in contrast to ) 3 Factorization-Forbidden Decays (3)

20 found 3 Factorization-Forbidden Decays (4) PRL88:031802(2002) A shift of the peak → interference?

21 4 Additional CP eigenstates Decay modes so far used for CP fitting

22 4 Additional CP eigenstates Cabbibo favored Decays: Nicola Cabibbo My favorite ferminews

23 4 Additional CP eigenstates: PRL:87, (2001)

24 4 Additional CP eigenstates: (2) ( Preliminary ) Angular analysis reveals (Significant longitudinal polarization)

25 4 Additional CP eigenstates: (3) Clear B signals

26 4 Additional CP eigenstates: (4)

27 5 Additional CP eigenstates Cabibbo suppressed decays: suppressed

28 5 Additional CP eigenstates: 79fb -1 (85M ) Preliminary #total=64 #bgd =11.7

29 5 Additional CP eigenstates: (2) 60fb -1 (65M ) Preliminary

30 6 Branching Fractions of Exclusive decays B + B 0 mode PDG(2000) * Belle PDG(2000) * Belle * : before Belle and BaBar#: preliminary

31 1)KEKB-Belle operating well (90fb -1 up to now) opening a new frontier 2)Missing charmonium state: (Consistent with theoretical expectations) 3) Factorization-forbidden processes found 7 Summary (1)

32 7 Summary (2) 4) Additional CP eigenstates: 5) Additional CP eigenstates: 6) Branching Fractions of Exculsive decays 7) Much more will come soon