We present an independent calculation of O(αs) matrix elements of the QCD penguin operators for the decays Bˉ→Xs(d)γ. 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 Bˉ→Xs(d)γ decay rates.
@article{arxiv.hep-ph/0401038,
title = {Rare decays $\bar{B}\to X_{s(d)}\gamma$ at the NLO},
author = {H. M. Asatrian and H. H. Asatryan and A. Hovhannisyan},
journal= {arXiv preprint arXiv:hep-ph/0401038},
year = {2009}
}