Branching Ratios for $B\to K^{\ast }\gamma$ and $B\to \rho \gamma$ Decays in Next-to-Leading Order in the Large Eneregy Effective Theory

A. Ali, A. Ya. Parkhomenko

We calculate the so-called hard spectator corrections in $\mathcal{O}({\alpha }_s)$ in the leading-twist approximation to the decay widths for $B\to K^{\ast }\gamma$ and $B\to \rho \gamma$ decays and their…