Bs,d→ℓ+ℓ- in the Standard Model with Reduced Theoretical Uncertainty

We combine our new results for the O(α_em) and O(αs2) corrections to Bs_,d→ℓ⁺ℓ^-, and present updated branching ratio predictions for these decays in the standard model. Inclusion of the new corrections removes major theoretical uncertainties of perturbative origin that have just begun to dominate over the parametric ones. For the recently observed muonic decay of the B_s meson, our calculation gives B¯(B_s→μ⁺μ^-)=(3.65±0.23)×10^-9.