1. Charmless Baryonic Decays B -> pph Ping-Han Chu National Taiwan University 2003.6.16 Outline: 1.Introduction 2.Event Selection 3.Physics Results 4.Systematic Error 5.Summary

2. Introdution The current-produced( J ) and transition( T ) diagrams for B -> ppK B p p K p p K B 1.B + -> ppK + 2.B + -> pp  + 3.B 0 -> ppK s 0 4.B + -> ppK* + ; (K* + -> K s 0  + ) 5.B 0 -> ppK* 0 ; (K* 0 -> K +  - ) J T Cited by Charmless three-body baryonic B decays Chun-Khiang Chua, Wei-Shu Hou, and Shang-Yuu Tsai, (PRD 66 054004) …These modes are of interest not just because of possibly large rates, but also by accessibility in detection…

3. KEKB Accelerator Asymmetric energy collision of electron = 8GeV, and positron = 3.5GeV Ring circumference : 3km RF frequency : 508MHz Target Luminosity = 1034 /cm^2/sec to produce more than 100 million B meson pairs in a year

4. KEKB Detector

5. Analyzed data 85 million BB events (78fb -1 ) at the  (4S) resonance recorded by the Belle before the summer 2002 are used in this analysis.

6. Event and reconstruction M bc dE M bc dE (All In CM frame)

7. Event Selection Track |dr|< 1Track|dz|< 3 PID> 0.6;KID> 0.6;  ID >0.6; Vchisq> 0;GoodKs> 0 0.48< mass Ks <0.520.86< mass K * < 0.94 Signal Region: Abs(dE)<0.055.27<Mb<5.29 Charm Vetopossible reasonance 2.85< M pp <3.128 J/  (3.07<mass<3.11 ,  c (2.97<mass<3.02) 3.315< M pp <3.735  c0  c1  c2  S  Lambda_c Veto 2.259<M pKs <2.312 cc

8. Continuum suppression continuum background suppression Event topoplogy Modified Fox-Wolfram moments Fisher discriminants Angular distribution B flight direction e+ e- bb B B B B  thr jet-like qq events spherical BB events

9. Angular distribution; B flight direction e+ e- bb B B B B  thr

10. Modified Fox-Wolfram moments r2so, r3so, r4so, r2oo, r3oo, r4oo

11. Fisher discriminants The use of multiple measurements in taxonomic problems. By R.A. Fisher. 1936. 10pp. Published in Annals Eugen.7:179-188,1936 NF7LR Fisher Parameters : costhr, spher, r2so, r4so,r2oo, r3oo, r4oo

12. Combined into a single Likelihood Ratio Likelihood method for signal determination(2-D fit)

13. Significance = 15.3

14. J/  CC Signal Region Sideband Region

15. MppBF(10^-6) 1.875-2.0 2.0-2.2 2.2-2.4 2.4-2.6 2.6-2.8 2.8-3.4 3.4-4.0 4.0-4.6 4.6-5.0 Total

16. Significance = 6.7

17. Signal Region Sideband Region

18. MppBF(10^-6) 1.875-2.0 2.0-2.2 2.2-2.4 2.4-2.6 2.6-2.8 2.8-3.4 3.4-4.0 4.0-4.6 4.6-5.0 Total

19. Significance = 5.1

20. J/  CC Signal Region Sideband Region

21. MppBF(10^-6) 1.875-2.0 2.0-2.2 2.2-2.4 2.4-2.6 2.6-2.8 2.8-3.4 3.4-4.0 4.0-4.6 4.6-5.0 Total

22. Significance = 6.0

23. J/  Signal Region Sideband Region

24. MppBF(10^-6) 1.875-2.0 2.0-2.2 2.2-2.4 2.4-2.6 2.6-2.8 2.8-3.4 3.4-4.0 4.0-4.6 Total

25. Significance = 3.14 Upper limit : 7.6*10 -6

26. K* + K* 0 D0D0

27. Calibrator

28. Compare with prevous result(exp7-exp13) Note: Mpp<3.4GeV

29. Acp Check PlusMinusAcp 50.50+-7.7845.91+-7.55-0.05+-0.11 21.57+-5.8315.48+-5.57-0.16+-0.22

30. Upper limit of Glueball Search 0.90*10^-6 C.L.90% Possible Hints and Search for Glueball Productin in Charmless Rare B Decays Chun-Khiang Chua, Wei-Shu Hou and Shang-Yuu Tsai (PLB544, 2002) 0.89*10^-6 C.L.90% 2.212.37

31. Systematic Error

32. Summary

33. Conclusion 1. spectrum can be compared with theorist's prediction. 2. Glueball search => giving upper limit. 3. The branching fraction of are different while we don't see this kind phenomenon in the relative modes, e.g., J/K and J/Ks, because of different isospin components.

34. Good Ks Momentum<0.50.5~1.5>1.5 Z distance<0.8<1.8<2.4 Fly length>0.08>0.22 dr>0.05>0.03>0.02 dd <0.3<0.1<0.03 Without GoodKs With GoodKs

36. J/  CC Signal Region Sideband Region

37. MppBF(10^-6) 1.875-2.0 2.0-2.2 2.2-2.4 2.4-2.6 2.6-2.8 2.8-3.4 3.4-4.0 4.0-4.6 Total