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

Wei Liu·Bin Zhang·Hanqing Zheng
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Abstract

We re-estimate the decay branching ratio of $B_s\to 2γ$ through $D_s^+D_s^-$ and $D_s^{*+}D_s^{*-}$ 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.

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Wei Liu, Bin Zhang, Hanqing Zheng. 1999-05-27. On the Long Distance Contribution to the $B_s\to γγ$ Decay in the Effective Lagrangian Approach. https://doi.org/10.1016/s0370-2693(99)00828-x

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