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

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

2004-01-08

arxiv.org/abs/hep-ph/0401038v2

Phys.Lett. B585 (2004) 263-275

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 4 figures

Scientific paper

10.1016/j.physletb.2004.02.013

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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