Bs,d -> l+ l- in the Standard Model with Reduced Theoretical Uncertainty
Abstract
We combine our new results for the O(alphaem) and O(alphas2) 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 Bs meson, our calculation gives BR(Bs -> mu+ mu-) = (3.65 + 0.23) * 10(-9).
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