Radiative dileptonic decays of B mesons

We investigate the radiative dileptonic decays B_s(B_d) -> γl⁺l^- within the standard model. Using the constituent quark model, the brancing ratios turn out to be around 5 × 10^-9 for B_s -> γμ⁺μ^-, and around 6 × 10^-10 for B_d -> γμ⁺μ^-, with slightly larger values for B_s(B_d) -> γe⁺e^-. The differential rate as a function of the dilepton invariant mass is given. The possibility of using these processes to determine the decay constants of B_s or B_d is discussed.