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CP Violation in Neutral B Meson System

CP Violation in Neutral B Meson System. J ingsheng Li Apr 16, 2007 Presentation for Intro. Exp. Part. Course. O utline. CKM Matrix CP Violation in B Meson Decay Detector Design and Data Selection Event Reconstruction Result Conclusion. CKM M atrix.

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CP Violation in Neutral B Meson System

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  1. CP Violation in Neutral B Meson System Jingsheng Li Apr 16, 2007 Presentation for Intro. Exp. Part. Course

  2. Outline • CKM Matrix • CP Violation in B Meson Decay • Detector Design and Data Selection • Event Reconstruction • Result • Conclusion

  3. CKM Matrix • Quark Mixing, SU(2)U(1) repr. • V=V1V2V3 • CP Violation due to  angle

  4. CKM Matrix continued B decay

  5. B Decay

  6. Indirect CP Violation Direct CP Violation Interference between channels (to deg ’) CP Violation in B Decay

  7. B Decay in Belle and BABAR PEP-II Lum: 31033/cm2s e+/e-:3.1GeV/9.0GeV =0.56 e+ e- z/(c)=t Flavor tag z CP Eigenstate Low momentum

  8. BaBar Detector 9GeV 3.1GeV

  9. Belle Detector

  10. Comparison

  11. CP Violation Parameter • Decay modes: • Distribution Asymmetry angular mixing f= -1 -1 -1 +1 0.650.07

  12. Event Reconstruction • Event Selection • Flavor Tagging Total events 32106 Full BCP <1000 • Fitting

  13. BABAR Result • Sin2=0.590.14(stat) 0.05(syst) • At 4 level • ||=0.930.09(stat) 0.03(syst)

  14. Belle Result • sin2=0.990.14(stat) 0.06(syst) • At 6 level

  15. Conclusion • (Indirect) CP Violation at 4 level • Now sin2=0.6850.032 • Direct CP Violation in • Precise Measurement for SM • Stay Tuned for New Physics (2005)

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