B-meson dileptonic decays enhanced by supersymmetry with large tanβ Original Research Article

We examined the rare decays B→Xsℓ+ℓ− and Bs→ℓ+ℓ−γ in the minimal supersymmetric model with large tanβ. Taking into account the effects of the gluino-loop and neutralino-loop with neutral Higgs exchange, we found that for a large tanβ the neutral Higgs exchanging diagrams could enhance Br(B→Xsτ+τ−) by a factor of 5 and Br(Bs→τ+τ−γ) by a couple of orders in some part of supersymmetric parameter space allowed by current experiments such as b→sγ,B→K(∗)ℓ+ℓ− and Bs→ℓ+ℓ−. The forward–backward asymmetry and the distributions of differential branching ratios are also found to differ significantly from the standard model results. Such enhanced branching ratios reach the level of 10−5 and thus might be observable in the new generation of B experiments.