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We study the rare radiative dileptonic decays $B^0(B_s)\to\gamma\ell^+\ell^-$ ($\ell=e,\mu$) in the standard model. By using the $B$meson wave function constrained by non-leptonic decays, the branching ratiosturn out to be of the order of $10^{-9}$ for $B_s\to\gamma\mu^+\mu^-$, $\gammae^+ e^-$ and $10^{-10}$ for $B^0\to\gamma\mu^+\mu^-$, $\gamma e^+ e^-$. Basedon the study, these decays are accessible at the near future LHC-b experiment,which are useful to determine the $B(B_s)$ wave function.Comment: 9 pages, including 3 figures, to apper in Comm. of Theor. Phy

A Study on Radiative Dileptonic Decays B 0 ( B s )→γℓ + ℓ −

A Study on Radiative Dileptonic Decays B ⁰ ( B _s )→γℓ ⁺ ℓ ⁻