Two-photon exclusive decays $B_s\to \eta ({\eta }^{\prime })\gamma \gamma$ and $B\to K\gamma \gamma$

Abstract

The exclusive decay modes $B\to K\gamma \gamma$ and $B_s\to \eta ({\eta }^{\prime })\gamma \gamma$ are shown to have significant branching ratios of approximately $0.5\times 10^{-7}$. This first calculation of these modes employs a model based on a cascade transition $B\to V\gamma \to P\gamma \gamma$ for estimating the long-distance contribution and the process $b\to s\gamma \gamma$ for the short distance one.

Comments: 11 Pages