Factorization in leptonic radiative B -> gamma eνdecays

Abstract

We discuss factorization in exclusive radiative leptonic B->γeνdecays using the soft-collinear effective theory. The form factors describing these decays can be expanded in a power series in Lambda/E_γwith E_γthe photon energy. We write down the most general operators in the effective theory which contribute to the form factors at leading order in Lambda_QCD/E_γ, proving their factorization into hard, jet and soft contributions, to all orders in alpha_s.

15 pages, 10 included .eps figures, final version to appear in Nuclear Physics B Ref-no: ZU-TH 17/02

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