Two-loop QCD corrections to charged-Higgs-mediated b sγ decay
P. Ciafaloni, A. Romanino, A. Strumia
Abstract
The charged-Higgs-mediated contribution to the Wilson coefficient of the b sγ magnetic penguin is expected to be one of the more promising candidates for a supersymmetric effect in B physics, probably the only one in gauge-mediated models. We compute the two-loop QCD correction to it. With naive dimensional regularization and MSbar subtraction, for reasonable values of the charged Higgs mass and for mu-bar = mtop, we find a (10--20)% reduction of the corresponding one-loop effect.
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