出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：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 [1]. In these sum rules
the short-distance scale refers to “hard-collinear” interactions with virtualities of order LQCDmb.
Hard scales (related to virtualities of order m2b
) 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 oneloop
accuracy. Thus, a systematic separation of hard, hard-collinear, and soft dynamics in the
heavy-quark limit is possible.
