Enhanced Non-local Power Corrections to the B->X_s+gamma Decay Rate

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dc.creatorLee, Seung J.
dc.creatorNeubert, Matthias
dc.creatorPaz, Gil
dc.date2006-09-21
dc.date2007-06-15
dc.date.accessioned2026-07-07T11:05:46Z
dc.date.available2026-07-07T11:05:46Z
dc.descriptionA new class of enhanced non-perturbative corrections to the inclusive B->X_s+gamma decay rate is identified, which contribute first at order Lambda/m_b in the heavy-quark expansion and cannot be described using a local operator product expansion. Instead, these effects are described in terms of hadronic matrix elements of non-local operators with component fields separated by light-like distances. They contribute to the high-energy part of the photon-energy spectrum but do not reduce to local operators when an integral over energy is taken to obtain the total inclusive decay rate. The dominant corrections depend on the flavor of the B-meson spectator quark and are described by tri-local four-quark operators. Their contribution is estimated using the vacuum insertion approximation. The corresponding uncertainty in the total decay rate is found to be at the few percent level. This new effect accounts for the leading contribution to the rate difference between B^- and B^0 mesons.
dc.description5 pages, 2 figures; few comments and references added; version to appear in PRD
dc.identifierhttps://arxiv.org/abs/hep-ph/0609224
dc.identifierhttp://arxiv.org/abs/hep-ph/0609224
dc.identifierPhys.Rev.D75:114005,2007
dc.identifierdoi:10.1103/PhysRevD.75.114005
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/189306
dc.subjectHigh Energy Physics - Phenomenology
dc.titleEnhanced Non-local Power Corrections to the B->X_s+gamma Decay Rate
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