$B\to K^{\ast }+\gamma$ and $B_s\to \varphi +\gamma$ on the Lattice

C. Bernard, P. Hsieh, A. Soni

A lattice calculation of the form factors that determine the ``hadronization ratios'', such as $R_{K^{\ast }}$ and $R_{\varphi }$, where $R_{K^{\ast }}\equiv [\Gamma ($B \to K^* γ$)/\Gamma (b\to s\gamma )]$, is prese…