On the double radiative decay of B_s-meson B→γγB\to\gamma\gamma

B_s-meson double radiative decay $B \to \gamma\gamma$ is investigated in frame of supersymmetric extension of the standard model. The branching ratio is calculated. It is shown that for light Higgs particle and heigh $\tan\beta$ supersymmetric contribution into branching ratio is significunt large than standard model estimate.Comment: 5 pages, latex, no figure

B_{s,d}\to \gamma\gamma decay in the model with one universal extra dimension

We estimate the beyond the Standard Model (SM) contribution to the B_{s,d} \to \gamma\gamma double radiative decay in the framework of the model with one universal extra dimension. This contribution gives a \sim 3 (6)% enhancement of the branching ratio calculated in the SM for B_{s (d)} \to \gamma\gamma.Comment: 5 pages, 1 fig, uses espcrc

B→γγB \to \gamma \gamma in an ACD model

We present a full calculation of the amplitudes for $B_{d[s]} \to \gamma \gamma$ in a simple ACD model that extends an incomplete one in a previous paper. We find cancellations between the contributions from different KK towers and a small decrease relative to the SM predictions. It is conjectured that radiative QCD corrections might actually lead to an enhancement in the branching ratios and {\bf CP} asymmetries, but no more than modest ones.Comment: 3 pages, 2 figure