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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
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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 Λ_{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.

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Fulvia De Fazio, Thorsten Feldmann, Tobias Hurth. 2005-09-16. The B --> pi form factor from light-cone sum rules in soft-collinear effective theory. https://arxiv.org/abs/hep-ph/0509167

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