RADIATIVE DILEPTONIC DECAYS OF B-MESON

We investigate the radiative dileptonic decays B-s(B-d) --> gamma l(+) l(-) within the standard model. Using the constituent quark model, the branching ratios turn out to be around 5 x 10(-9) for B-s --> gamma m u(+)mu(-) and around 6 x 10(-10) for B-d --> gamma mu(+)mu(-) with sli ghtly larger values for B-s(B-d) --> gamma e(+)e(-). The differential rate as a function of the dilepton invariant mass is given. The possib ility of using these processes to determine the decay constants of B-s or B-d is discussed.