Remarks on the sign ofCPasymmetries

Abstract

Several experiments are about to measure the $\mathrm{CP}$ asymmetry for $\overrightarrow{B}\psi K_S$ and other decays. The standard model together with the Kobayashi-Maskawa ansatz for $\mathrm{CP}$ violation predicts the sign as well as the magnitude for this asymmetry. In this paper we elucidate the physics and conventions which lead to the prediction for the sign of the asymmetry.