Speaker
Description
Direct CP violation in B meson decays provides a good probe for New Physics. We report measurement of branching fraction(BF) and direct CP asymmetries (Acp) in charmless B decays B+ → KsKsK+ and B+ → KsKspi+, which proceed through b→s and b→d flavor-changing neutral current transitions, respectively. Another charmless B decay B0 → K-pi+Ks, which proceeds through b→d penguin process, is also studied. Strong evidence of localized Acp was observed in a similar decay B+ → K+K-pi+ by Belle, and in the presentation, differential Acp and BF measurements as a function of K-Ks invariant mass are reported in addition to the total Acp and BF measurements. We also cover Acp of B0bar → D0 (K+pi-) pi0 and B0bar → D0 (K+pi-pi0) pi0 decays, which provide an interesting probe of subtle interference effects via CKM disfavoured transitions. Finally, we report on our latest measurements of B+ → D(*)K+ decay, sensitive to CKM unitarity triangle angle gamma/phi3, involving D decays to K+- pi-+, CP eigenstates and the almost pure CP even state pi+ pi- pi0. The analyses are based on the full data set recorded by the Belle detector at the Υ(4S) resonance containing 772 million BBbar pairs.
