Annihilation type rare radiative $B_{(s)}\to V\gamma$ decays

Abstract

We obtain predictions for a number of radiative decays $B_{(s)}\to V\gamma$, $V$ the vector meson, 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 latter subprocesses were not considered in the previous analyses but are found to have sizeable impact on the $B_{(s)}\to V\gamma$ decay rate. 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\%.

15 pages, minor stylistic changes, version to appear in Physical Review D. arXiv admin note: text overlap with arXiv:hep-ph/0110087

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