Magnetic dipole operator contributions to the photon energy spectrum in anti-B -> X(s) gamma at O(alpha(s)^2)

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dc.creatorAsatrian, H. M.
dc.creatorEwerth, T.
dc.creatorFerroglia, A.
dc.creatorGambino, P.
dc.creatorGreub, C.
dc.date2006-07-28
dc.date.accessioned2026-07-07T11:05:20Z
dc.date.available2026-07-07T11:05:20Z
dc.descriptionWe compute the O(α_s^2) contributions to the photon energy spectrum of the inclusive decay \bar{B} -> X_s γassociated with the magnetic penguin operator O_7. They are an essential part of the ongoing NNLO calculation of this important decay. We use two different methods to evaluate the master integrals, one based on the differential equation approach and the other on sector decomposition, leading to identical results which in turn agree with those of a recent independent calculation by Melnikov and Mitov. We study the numerical relevance of this set of NNLO contributions in the photon energy spectrum and discuss the change of bottom quark mass scheme.
dc.description18 pages, uses axodraw.sty
dc.identifierhttps://arxiv.org/abs/hep-ph/0607316
dc.identifierhttp://arxiv.org/abs/hep-ph/0607316
dc.identifierNucl.Phys.B762:212-228,2007
dc.identifierdoi:10.1016/j.nuclphysb.2006.11.002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/189175
dc.subjectHigh Energy Physics - Phenomenology
dc.titleMagnetic dipole operator contributions to the photon energy spectrum in anti-B -> X(s) gamma at O(alpha(s)^2)
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