Completing the NLO QCD calculation of B -> Xs gamma

Details Completing the NLO QCD calculation of B -> Xs gamma Completing the NLO QCD calculation of B -> Xs gamma

2002-03-14

arxiv.org/abs/hep-ph/0203135v1

Nucl.Phys. B631 (2002) 219-238

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 2 figures, uses graphicx

Scientific paper

10.1016/S0550-3213(02)00261-4

We evaluate two-loop b -> s gamma matrix elements of all the four-quark operators containing no derivatives. Contrary to previous calculations, no expansion in the mass ratio mc/mb is performed, and all the possible Dirac and flavor structures are included. Consequently, we are able to provide the last item in the NLO analysis of B -> Xs gamma that has been missing so far, namely the two-loop matrix elements of the QCD-penguin operators. Due to smallness of the Wilson coefficients of those operators in the Standard Model, their effect on the branching ratio is small: a reduction by roughly 1%. We find BR[ B -> Xs gamma]_{E_gamma > 1.6 GeV} = (3.57 +_ 0.30)*10^{-4}.

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