Supersymmetric contributions to direct CP violation in K -> pi pi gamma decays

Abstract

We analyze the supersymmetric contributions to direct-CP-violating observables in $K\to \pi \pi \gamma$ decays induced by gluino-mediated magnetic-penguin operators. We find that ${\text{epsp}}_{+-\gamma }$ and the differential width asymmetry of $K^{\pm }\to {\pi }^{\pm }{\pi }^0\gamma$ decays could be substantially enhanced with respect to their Standard Model values, especially in the scenario where $\text{epsp}/\text{eps}$ is dominated by supersymmetric contributions. These observables could therefore provide a useful tool to search for New Physics effects in $|\Delta S|=1$ transitions, complementary to $\text{epsp}/\text{eps}$ and rare decays.

Comments: 14 pages, Latex. Numerical error in Eq.(36) corrected, conclusions unchanged; version to appear in Phys. Lett. B