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Light-cone sum rules in soft-collinear effective theory | | Fulvia De Fazio
; Thorsten Feldmann
; Tobias Hurth
; | | Date: |
12 Apr 2005 | | Subject: | hep-ph | | Affiliation: | INFN Bari), Thorsten Feldmann (U Siegen), and Tobias Hurth (CERN & SLAC | | Abstract: | 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. | | Source: | arXiv, hep-ph/0504088 | | Services: | Forum | Review | PDF | Favorites | |
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