MEASUREMENT OF sin 2Φ_1 IN b → c AND b → s DECAYSAT Belle

摘要

Measurements of time-dependent CP asymmetries in B~0 →J/ψK~0, ΦK~0K~+K~-K_S,η'K_s,f_0(980)sandwK_sdecays based on 386 x 10~6BBpairs col-lected by the Belle detector are presented. With this data sample, the J/ψK~0modeprovides a precision measurement of sin 2Φ_1. The other modes, which proceed via b→spenguin (loop) diagrams are sensitive to new physics phases which mayappear within the loop. Differing sin 2Φ_1measurements betweenJ/ψK~0and the b→spenguin modes could be a signature of such phases.