Charge asymmetry inK±→π±γγinduced by the electromagnetic penguin operators

Abstract

The $\mathrm{CP}$-violating charge asymmetry in the decays ${K}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\gamma}\ensuremath{\gamma},$ which is induced by the electromagnetic penguin operators, has been studied both in the standard model and in its extensions. Because of a large enhancement of the Wilson coefficients of the electromagnetic penguin operators in the supersymmetric extensions of the standard model, a significant upper bound on this charge asymmetry could be expected, and thus high-precision measurements of this interesting $\mathrm{CP}$-violating quantity might explore new physics effects beyond the standard model.