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Rare decays bar{B}to X_(s(d))γ at the NLO

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arxiv hep-ph/0401038 v2 pith:PMGMFB7N submitted 2004-01-08 hep-ph

Rare decays $\bar{B}\to X_{s(d)}\gamma$ at the NLO

classification hep-ph
keywords gammanumericaldecaysalphaanalysisappliedcalculatedcalculation
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

We present an independent calculation of ${\cal{O}}(\alpha_s)$ matrix elements of the QCD penguin operators for the decays $\bar{B}\to X_{s(d)}\gamma$. The Mellin-Barnes representation technique is applied for the systematic numerical evaluation of involved two-loop diagrams. The numerical effect of the calculated contributions is confirmed to be of order of 1%. We also present an updated numerical analysis for $\bar{B}\to X_{s(d)}\gamma$ decay rates.

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