22-28 July 2010
Palais des Congrès de Paris
Europe/Paris timezone

CP and CPT Violation in B decays at Belle

23 Jul 2010, 14:15
Salle 242A ()

Salle 242A

Parallel Session Talk 06 - CP violation, CKM and Rare Decays 06 - CP violation, CKM and Rare Decays


Takeo Higuchi (KEK)


We present a search for direct CP violation in B^+ -> J/psi K^+ decays using a large data sample collected at the Upsilon(4S) resonance with the Belle detector operating at the KEKB asymmetric-energy e^+ e^- collider. The Standard Model predicts a small direct CP asymmetry, and the experimental precision is of the same level as the expected deviation predicted by some extensions of the Standard Model. We also present measurements of time-dependent CP asymmetries in neutral B decays to charmonium final states, and a measuremen of CP-violating parameters in B0 decays to the K_S0 K^+ K^- final state, including B0 --> phi K_S0, using a time-dependent Dalitz plot analysis. CPT is expected to be a fundamental symmetry with no significant deviations. Nonetheless we can introduce an artificial perturbation parameter to the B0-anti{B}0 mixing system that violates CPT symmetry. The CPT violating parameter, which is a complex number but expected to be zero, can be probed through proper time difference distributions in correlated B meson pair decays. We present a measurement of the CPT violating parameter using the large Belle data sample.

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