Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-04-12
Nucl.Phys.B733:1-30,2006; Erratum-ibid.B800:405,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
34 pages, 9 figures, erratum added
Scientific paper
10.1016/j.nuclphysb.2005.09.047
We 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.
Fazio Fulvia de
Feldmann Thorsten
Hurth Tobias
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