Factorization in exclusive semileptonic radiative B decays
Vincenzo Cirigliano, Dan Pirjol
Abstract
We derive a new factorization relation for the semileptonic radiative decay B -> π νγin the kinematical region of a slow pion pπ~ Λand an energetic photon Eγ>> Λ, working at leading order in Λ/mb. In the limit of a soft pion, the nonperturbative matrix element appearing in this relation can be computed using chiral perturbation theory. We present a phenomenological study of this decay, which may be important for a precise determination of the exclusive nonradiative decay.
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