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Penguin Dominated CP Violation, DCPV and Search for New Physics

Penguin Dominated CP Violation, DCPV and Search for New Physics. Yee B. Hsiung, National Taiwan University  5th Rencontres du Vietnam  Hanoi, 6-11 th August 2004. Introduction to Penguin Radiative Penguin Decays DCPV Status & Perspective. CP Violation by Kobayashi-Maskawa.

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Penguin Dominated CP Violation, DCPV and Search for New Physics

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  1. Penguin Dominated CP Violation, DCPV and Search for New Physics Yee B. Hsiung, National Taiwan University  5th Rencontres du Vietnam  Hanoi, 6-11th August 2004 • Introduction to Penguin • Radiative Penguin Decays • DCPV • Status & Perspective

  2. CP Violation by Kobayashi-Maskawa KM ansatz:CP violation is due to complex phase in quark mixing matrix unitarity triangle CP violation parameters (f1, f2, f3) = (b, a, g)

  3. Time Dependent CP Asymmetry S= -xfsin2f1: SM prediction A= 0 or |l| = 1  No direct CPV Af q l = hf CP CP p Af Inputs: xf = -1, S = 0.6 A= 0.0 CP

  4. New Physics Hunting in b sqq SM predicts same CPV in b ccs and sqq. New physics maydeviateCPV in b ccs from sqq New process w/ different CP phase SM penguin + e.g.) squark penguin Deviation fromb  ccs Hint of new physics !

  5. Tree vs Penguin

  6. The KEK-B Collider 3.5 GeV e+ on 8 GeV e- L > (1.3 x 1034)/cm2/sec Y(4S)  L dt = 286.8 fb-1 274 M BB pairs!

  7. The Belle Detector @KEK and KL detection system Aerogel Cherenkov Counter 3.5 GeV e+ 3 layers Silicon Vertex Detector  4 layers Electromagnetic. Cal.(CsI crystals) 8 GeV e- Central Drift Chamber 1.5T SC solenoid ToF counter

  8. The BaBar Detector @SLAC

  9. CP Violation in b ccs 5417 events @ 152M BB poor flavor tag Small systematic uncertainty  Well controlled analysis technique fine flavor tag consistent with no Direct CPV

  10. b sqq Reconstructions • B0fKS:f K+K, KS p+p • Minimal kaon-identification requirements. • Belle standard KS selection. • | M(KK)  M(f) | < 10MeV/c2(mass resolution = 3.6 MeV/c2). • | pf | in CMS > 2.0 GeV/c. • Belle standard continuum suppression. • | DE | < 60MeV, 5.27 < Mbc < 5.29 GeV/c2. M(KK) [GeV/c2] • Background is dominated by continuum • CP in the background: • K+K-KS: (7.2±1.7)% • f 0(980)KS: • These effects are included in the systematic error.

  11. CP Violation in b sqq @ 152M BB 6811 signals 106 candidates for S and A fit purity = 0.640.10 efficiency = 27.3% B0 fKS 19918 signals 361 candidates for S and A fit purity = 0.550.05 efficiency = 15.7% B0 K+K-KS B0 hKS 24421 signals 421 candidates for S and A fit purity = 0.580.05 efficiency = 17.7% (h´ hp+p) 15.7% (h´ rg )

  12. CP Violation in b sqq Fit sin2f1 @ 152M BB B0 fKS B0K+K-KS B0h’KS BfCP(sqq) decay vertices are reconstructed using K- or p-track pair.

  13. Statistical Significance • B0K+K-KS, h´KS • Consistent with sin2f1. • B0 fKS • 3.5s deviation (Feldman-Cousins). • S(fKS) = sin2f1: 0.05% probability. • Hint of new physics? • Need more data to establish conclusion. Smoking gun? K. Abe et al. [Belle collaboration], PRL 91, 261602 (2003)

  14. Summary of sin2f1 (b) 3.5s 2.4s

  15. Another smoking gun?

  16. Comparing with B  r+r0 ~100% longitudinally polarized

  17. Radiative Penguin Decays b -> sg and b -> sl+l- decays proceed via flavour changing neutral current (FCNC) box and penguin diagrams b -> sg penguin: BR(b->sg)  3.5  10-4 Not so rare actually…

  18. b -> sl+l- penguin: b -> sl+l- box: + BR(b->sl+l-)  aemBR(b->sg)  10-6 !!! New particlescan/will contribute quite significantly to the decay rates and various asymmetries quite significantly via the loops! => Ideal testing ground for SM and extensions (2HDM, MSSM, GUT, …?)

  19. Radiative Penguin Results

  20. BR(B -> XSll )

  21. BR(B -> XSll )

  22. BR(B -> XSll)

  23. Check MXs and Mll mass

  24. ACP(B -> K*g )

  25. Update ACP(B -> K*g )

  26. b->sg Photon Energy Spectrum

  27. Search for b->dg

  28. BaBar Results on b->dg Search

  29. Belle Results on b->dg Search More in Parrallel session

  30. There are lots of them…

  31. Direct CP Violation in pp/Kp

  32. Direct CP Violation in pp 3.2s DCPV PRL 93, 021601 (2004)

  33. ACP in Charmless B Decays World average Acp(K+p-) -0.0950.028 Hint of DCPV?

  34. More ACP in Charmless B Decays

  35. BaBar’s new ACP for K+p- new BaBar 4.2s Acp(K+p-) = -0.1330.0300.009 B. Aubert et al.,hep-ex/0407057 2.4s Belle Acp(K+p-) = -0.0880.0350.013 Y. Chao et al.,hep-ex/0407025

  36. Status and Prospect • Smoking gun results in Penguin dominated processes, such as • B0 f KS and B0 f K* have been around the corner. • More data is needed to clarify the situation. But soon we shall find out the answer. • Radiative Penguin decays are ideal testing ground for SM and new physics. However, no smoking gun yet! • Need more data to fix some of the important parameters inEW/radiative penguin transitions • Direct CP Violation in B-decays may surface very soon. • Many interesting discoveries are still ahead…

  37. Future Prospect of f1 (b) Measurements

  38. Future Prospect of f2 (a) Measurements 0.5 ab-1 5 ab-1 50 ab-1 Going for Super B factory

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