Structure-Dependent QED Effects in Exclusive B Decays at Subleading Power

Claudia Cornella, Matthias König, Matthias Neubert

We derive a factorization theorem for the structure-dependent QED effects in the weak exclusive process $B^{-}\to {\ell }^{-}\bar{\hat{I}}{½}_{\ell }$, i.e., effects probing the internal structure of t…