Abstract
Using the Bs meson wave function extracted from non-leptonic Bs decays, we reevaluate the rare decays Bs → l+l− γ, (l=e, μ) in the Standard Model, including two kinds of contributions from the magnetic-penguin operator with virtual and real photons. We find that contributions to the exclusive decays from the magnetic-penguin operator b → sγ with real photons, which were regarded as negligible in the previous literature, are large and the branching ratios Bs → l+l− γ are enhanced by a factor of almost 2. With the predicted branching ratios of the order of 10−8, it is expected that these radiative dileptonic decays will be detected in LHC-b and B factories in the near future.
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