Factorization and Sudakov Resummation in B -> gamma l nu
Stefan W. Bosch
Abstract
We apply Soft-Collinear Effective Theory to prove at leading power in LambdaQCD/mb a factorization formula for the radiative leptonic decay B -> gamma l nu. Large logarithms entering the hard-scattering kernel are systematically resummed by a two-step perturbative matching procedure.
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