Mass mixing, CP violation and left-right symmetry for heavy neutral mesons

Abstract

We investigate\(M^0 - \bar M^0 \) mixing and CP violation in the minimal left-right symmetric gauge model with spontaneous P and CP violation. The dominant contributions to the mixing amplitude including QCD corrections are calculated explicitly for\(B^0 - \bar B^0 \). While the amount of mixing is not much changed with respect to the standard model leftright symmetry can give rise to significantly larger CP violation in the\(B_s^0 - \bar B_s^0 \) system (up to two orders of magnitude for the dilepton charge asymmetry). Sizable CP violating effects require that the left-right contribution to theK L K S mass difference has the same sign as the standard model contribution. We also comment on\(D^0 - \bar D^0 \) mixing including a careful discussion of the standard model prediction for the short distance part.