1. Rare and Radiative B Decays M.-Z. Wang ( 王名儒 ) on behalf of the Belle Collaboration ICFP2005Outline IntroductionIntroduction B → XB → X s γ moments B →B → B +  pΛγ B →B → X s l + l - B →B → K*l + l - FB Asym. b → b → d γ SummarySummary

2. 2005/10/4 ICFP2005 Rare Radiative B Decays Motivation and Review C7 C7,C9,C10

3. 2005/10/4 ICFP2005 Rare Radiative B Decays Integrated Luminosity 1.6 229M BB

4. 2005/10/4 ICFP2005 Rare Radiative B Decays B → X B → X s γ from a sum of 38 exclusive decay modes Eγ>1.9 GeV hep-ex/0508004, 88.9 MBB

5. 2005/10/4 ICFP2005 Rare Radiative B Decays B → X B → X s γmoments from measured spectrum Consistent with theory

6. 2005/10/4 ICFP2005 Rare Radiative B Decays hep-ex/0507001, 88.5 MBB Inclusive B → X Inclusive B → X s γand Acp Use lepton tagging consistent with zero

7. 2005/10/4 ICFP2005 Rare Radiative B Decays E B → X E γ spectrum of B → X s γ 140fb -1

8. 2005/10/4 ICFP2005 Rare Radiative B Decays Retrieving true moments from measurements

9. 2005/10/4 ICFP2005 Rare Radiative B Decays Comparing with theory hep-ex/0508005

10. 2005/10/4 ICFP2005 Rare Radiative B Decays B +  pΛγ PRL 95, 061802, 2005 Simultaneous fit on B  pΛγ and B  pΣ 0 γ Signal Yield for B  pΛγ with M p Λ <2.4GeV/c 2 : 34.1 Statistical Significance: 8.6σ BF(B  pΛγ ): 2.16 ± 0.20x10 -6 BF( B  pΣ 0 γ ):<4.6 x 10 -6 140fb -1 pΛγSignal

11. 2005/10/4 ICFP2005 Rare Radiative B Decays Photon energy and Angular distribution Fit results in bins of cosθ X with M pΛ <4.0GeV/c 2 (Assuming X  pΛ, calculated in X rest frame.) Λ γ p θxθx b  sγ MC Signal Yield qq background Signal Yield Lab frameX frame

12. 2005/10/4 ICFP2005 Rare Radiative B Decays B → B → K ( * ) l + l - hep-ex/0507009, 229 M BB Assuming charged equals to neutral and

13. 2005/10/4 ICFP2005 Rare Radiative B Decays Decay width for b  sl + l - decay Decay width for b  sll can be described with Wilson coefficients. Interference term  sign of C 7 relative to C 9 as well as absolute values |C i | can be determined !! SM Sign of C 7 flipped case T.Goto et al. PRD 55 4273 (1997)

14. 2005/10/4 ICFP2005 Rare Radiative B Decays Measurement of B(B  X s l + l - ) Semi-inclusive technique X s is reconstructed from K + or K s + 0-4 (at most one  0 is allowed) M Xs < 2.0 GeV Electron or muon pair M ll >0.2GeV Charmonium veto 140/fb data Theoretical preduction by Ali et al. Wrong flavor M Xs q2q2 M. Iwasaki et al. submitted to PRD, hep-ex/0503044

15. 2005/10/4 ICFP2005 Rare Radiative B Decays Constraints on C i from B(B  X s l + l - ) Clean prediction for B(B  Xsll) with 1<q 2 <6GeV 2 is available. Combine Belle and Babar results Sign of C7 flipped case with SM C9 and C10 values is unlikely. P.Gambino, U.Haisch and M.Misiak PRL 94 061803 (2005) BFBelleBabarWASMC 7 = -C 7 SM q 2 >(2m  ) 2 4.11±1.15.6±2.04.5±1.04.4±0.78.8±0.7 1<q 2 <6GeV 2 1.5±0.61.8±0.91.60±0.51.57±0.163.30±0.25 C 7 SM C 7 = -C 7 SM C 10 NP C 9 NP Donut : 90% CL allowed region

16. 2005/10/4 ICFP2005 Rare Radiative B Decays New Measurement of A FB (q 2 ) in K*ll Forward-backward asymmetry is induced by interference btw virtual photon and Z 0 contributions. Relative signs and magnitudes of C 7 to C 10 and C 9 to C 10 can be determined from A FB (B  K*ll)!! We do not use C i but A i which is leading coefficients.

17. 2005/10/4 ICFP2005 Rare Radiative B Decays Signals for B  K*l + l - 357/fb data  386x10 6 BB pairs Electron or muon pair Charmonium veto K*(K +  -, Ks +, K +  0 ) |M K – M K* | < 75MeV Signal yield K*ll 114  14, purity 44% Null test sample K + ll 96  12, purity 57% K + ll has no asymmetry. hep-ex/0508009

18. 2005/10/4 ICFP2005 Rare Radiative B Decays Fit results for ratios of Wilson coefficients Null test with K + ll Projection to A FB SM Best fit for negative A 7 (SM like) J/ ’’ Best fit for positive A 7 (non-SM like) (This solution is also allowed) Unbinned fit projection

19. 2005/10/4 ICFP2005 Rare Radiative B Decays Confidence contours for Wilson Coef. For any allowed A 7, we obtain 95% CL Sign of A 9 A 10 is negative!! Sign of A 9 A 10 flipped case is excluded The first and third quadrants Sign of A 7 A 10 is not determined yet. The second and fourth quadrants fit result A7A10 sign flipped (to SM) A 9 A 10 sign flipped Both A 7 A 10 and A 9 A 10 signs flipped ＳＭ A9/A7 A10/A7 SM

20. 2005/10/4 ICFP2005 Rare Radiative B Decays b → Motivation for b → d γ Complementary to the Tevatron B s mixing program

21. 2005/10/4 ICFP2005 Rare Radiative B Decays b → Observation of b → d γ

22. 2005/10/4 ICFP2005 Rare Radiative B Decays Combined fit results

23. 2005/10/4 ICFP2005 Rare Radiative B Decays Constraints on |V td /V ts |

24. 2005/10/4 ICFP2005 Rare Radiative B Decays B → X Summary of B → X sd γ  HFAG releases new world average after major international conference  Web Site: http://www.slac.stanford.e du/xorg/hfag/

25. 2005/10/4 ICFP2005 Rare Radiative B Decays B → Summary of B → X s l + l -

26. 2005/10/4 ICFP2005 Rare Radiative B Decays Summary Radiative B decays are well established, more tests can be done with various aspects. B → First determination of the Wilson coef. from B → K*l + l - (X s l + l - ) decays. b → First observation of b → d γ. Thanks to HFAG, one can have easy access to up-to-date information. Looking forward to unexpected new physics with a much larger data set – Super KEKB-factory talk by M. Hazumi.