Studies of $CP$ Violation in $B\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{*}$ Decays

Studies of $C P$ Violation in $B \to J / ψ K^{*}$ Decays

R. Itoh et al. (Belle Collaboration)

Phys. Rev. Lett. 95, 091601 – Published 26 August 2005

Abstract

$C P$ violation in $B \to J / ψ K^{*}$ 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 $C P$ violation. $T$ -odd $C P$ 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 $C P$ -violating parameters: $\sin 2 ϕ_{1} = 0.24 \pm 0.31 \pm 0.05$ and $\cos 2 ϕ_{1} = 0.56 \pm 0.79 \pm 0.11$ .