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Calculation of two-loop virtual corrections to b --> s l+ l- in the standard model

H. H. Asatryan·H. M. Asatrian·C. Greub·M. Walker
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Abstract

We present in detail the calculation of the virtual O(alpha_s) corrections to the inclusive semi-leptonic rare decay b --> s l+ l-. We also include those O(alpha_s) bremsstrahlung contributions which cancel the infrared and mass singularities showing up in the virtual corrections. In order to avoid large resonant contributions, we restrict the invariant mass squared s of the lepton pair to the range 0.05 < s/mb^2 < 0.25. The analytic results are represented as expansions in the small parameters s/mb^2, z = mc^2/mb^2 and s/(4 mc^2). The new contributions drastically reduce the renormalization scale dependence of the decay spectrum. For the corresponding branching ratio (restricted to the above s-range) the renormalization scale uncertainty gets reduced from +/-13% to +/-6.5%.

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H. H. Asatryan, H. M. Asatrian, C. Greub, M. Walker. 2002-04-08. Calculation of two-loop virtual corrections to b --> s l+ l- in the standard model. https://doi.org/10.1103/physrevd.65.074004

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