B-meson dileptonic decays enhanced by supersymmetry with large β

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We examined the rare decays B→ Xₛℓ+ℓ- and Bₛ→ℓ+ℓ-γ in the minimal supersymmetric model with large β. Taking into account the gluino-loop and neutralino-loop effects, we found that for a large β 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.