Factorization in leptonic radiative B -> gamma e decays
Abstract
We discuss factorization in exclusive radiative leptonic B->γ e decays using the soft-collinear effective theory. The form factors describing these decays can be expanded in a power series in Lambda/Eγ with Eγ the photon energy. We write down the most general operators in the effective theory which contribute to the form factors at leading order in LambdaQCD/Eγ, proving their factorization into hard, jet and soft contributions, to all orders in alphas.
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