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The B --> pi form factor from light-cone sum rules in soft-collinear effective theory | | Fulvia De Fazio
; Thorsten Feldmann
; Tobias Hurth
; | | Date: |
16 Sep 2005 | | Subject: | hep-ph | | Affiliation: | Bari), Thorsten Feldmann (Siegen), Tobias Hurth (CERN, SLAC | | Abstract: | Recently, we have derived light-cone sum rules for exclusive B-meson decays into light energetic hadrons from correlation functions within soft-collinear effective theory. 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. Factorization of the correlation function has been verified to one-loop accuracy. Thus, a systematic separation of hard, hard-collinear, and soft dynamics in the heavy-quark limit is possible. | | Source: | arXiv, hep-ph/0509167 | | Services: | Forum | Review | PDF | Favorites | |
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