RADIATIVE-CORRECTIONS TO THE DECAY B-]PI-E-NU AND THE HEAVY-QUARK LIMIT

We calculate radiative corrections to the light-cone sum rule for the semileptonic form factor in B --> pi ev decays and thus remove the maj or uncertainty in determining the CKM mixing angle \V-ub\ by this meth od. We discuss the remaining uncertainties and perspectives for furthe r studies. The structure of the radiative corrections suggests factori zation of soft (end-point) and hard rescattering contributions in heav y-to-light decays in the heavy quark limit. (C) 1998 Elsevier Science B.V.