Weak-annihilation rare radiative decays of B-mesons

Abstract

In this talk, we present the predictions for a number of radiative decays $B_{(s)}\to V\gamma$, with the vector meson in the final state, which proceed through the weak-annihilation mechanism. Within the factorization approximation, we take into account the photon emission from the $B$-meson loop and from the vector-meson loop. The highest branching ratios for the weak-annihilation reactions reported here are $\mathcal{B}({\bar{B}}_s^0\to J/\psi \gamma )=1.5\cdot 10^{-7}$ and $\mathcal{B}(B^{-}\to {\bar{D}}_s^{\ast -}\gamma )=1.7\cdot 10^{-7}$, the estimated accuracy of these predictions being at the level of 20%.

Comments: Talk given at XXII International Workshop on High Energy Physics and Quantum Field Theory (QFTHEP'2015), June 24 - July 1 2015, Samara, Russia