Weak annihilation rare radiative B-decays

Abstract

We give predictions for the branching ratios of several rare radiative B-decays which proceed only through weak annihilation mechanism. In addition to previous analysis we estimate the branching ratios of ${\bar{B}}_s^0\to D^{\ast 0}\gamma$ and $B_c^{-}\to {\rho }^{-}\gamma$ decays and obtain $2.87\cdot 10^{-9}$ and $2.59\cdot 10^{-7}$ for them correspondingly. The accuracy of the predictions is at the level of 20\%.

Comments: 5 pages, 4 figures, Contribution to the proceedings of HSQCD 2016, June 27 -- July 1, 2016, Gatchina, Russia