Annihilation type rare radiative B₍ₛ₎→ Vγ decays

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We obtain predictions for a number of radiative decays B₍ₛ₎→ Vγ, 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₎→ Vγ decay rate. The highest branching ratios for the weak-annihilation reactions reported here are B(B⁰ₛ→ J/ψγ)=1.5· 10⁻⁷ and B(B-→ Dₛ*⁻γ)=1.7· 10⁻⁷, the estimated accuracy of these predictions being at the level of 20%.