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Annihilation-type rare radiative B ( s ) → V γ decays

2016; American Physical Society; Volume: 93; Issue: 1 Linguagem: Inglês

10.1103/physrevd.93.014015

2470-0037

A. Kozachuk, Dmitri Melikhov, Nikolai Nikitin,

High-Energy Particle Collisions Research

We obtain predictions for a number of radiative decays ${B}_{(s)}\ensuremath{\rightarrow}V\ensuremath{\gamma}$, $V$ 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 a sizeable impact on the ${B}_{(s)}\ensuremath{\rightarrow}V\ensuremath{\gamma}$ decay rate. The highest branching ratios for the weak-annihilation reactions reported here are $\mathcal{B}({\overline{B}}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\gamma})=1.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$ and $\mathcal{B}({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\overline{D}}_{s}^{*\ensuremath{-}}\ensuremath{\gamma})=1.7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$, the estimated accuracy of these predictions being at the level of 20%.