On the Long Distance Contribution to the $B_s\to \gamma \gamma$ Decay in the Effective Lagrangian Approach

Abstract

We re-estimate the decay branching ratio of $B_s\to 2\gamma$ through $D_s^{+}{D}_s^{-}$ and $D_s^{\ast +}{D}_s^{\ast -}$ intermediate states, in the effective Lagrangian approach. We find that the branching ratio does not exceed a few times $10^{-7}$, contrary to the result recently claimed in the literature.

7 pages

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