Studies of CP violation in B->J/psi K* decays

Abstract

CP violation in $B\to J/ψK^*$ decays is studied using an angular analysis in a data sample of 253 fb$^{-1}$ recorded with the Belle detector at the KEKB $e^+e^-$ collider. The flavor separated measurements of the decay amplitudes indicate no evidence for direct CP violation. T-odd CP violation is studied using the asymmetries in triple product correlations, and the results are consistent with the Standard Model null predictions. The time-dependent angular analysis gives the following values of CP violating parameters: $\sin 2ϕ_1 = 0.24 \pm 0.31 \pm 0.05$ and $\cos 2ϕ_1 = 0.56 \pm 0.79 \pm 0.11$.