Light-cone sum rules in soft-collinear effective theory

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dc.creatorDe Fazio, Fulvia
dc.creatorFeldmann, Thorsten
dc.creatorHurth, Tobias
dc.date2005-04-12
dc.date2008-04-18
dc.date.accessioned2026-07-07T11:43:33Z
dc.date.available2026-07-07T11:43:33Z
dc.descriptionWe derive light-cone sum rules (LCSRs) for exclusive B-meson decays into light energetic hadrons from correlation functions within soft-collinear effective theory (SCET). In these sum rules the short-distance scale refers to ``hard-collinear'' interactions with virtualities of order (Lambda_{QCD}*m_b). Hard scales (related to virtualities of order m_b^2) are integrated out and enter via external coefficient functions in the sum rule. Soft dynamics is encoded in light-cone distribution amplitudes for the B-meson, which describe both the factorizable and non-factorizable contributions to exclusive B-meson decay amplitudes. As an example, we provide a detailed study of the SCET sum rule for the B -> pi transition form factor at large recoil, including radiative corrections from hard-collinear loop diagrams at first order in the strong coupling constant. We find remarkable conceptual and numerical differences with the heavy-quark limit of the conventional LCSR approach in QCD.
dc.description34 pages, 9 figures, erratum added
dc.identifierhttps://arxiv.org/abs/hep-ph/0504088
dc.identifierhttp://arxiv.org/abs/hep-ph/0504088
dc.identifierNucl.Phys.B733:1-30,2006; Erratum-ibid.B800:405,2008
dc.identifierdoi:10.1016/j.nuclphysb.2005.09.047 10.1016/j.nuclphysb.2008.03.022
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/201278
dc.subjectHigh Energy Physics - Phenomenology
dc.titleLight-cone sum rules in soft-collinear effective theory
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