A comment on the extractions Of V-ub from radiative decays

We present a model independent closed form expression for \V-ub\(2)/\VtbVts *\(2) , which includes the resummation of large endpoint logarithms as well as the interference effects from the operators O-2 and O-8. We demonstrate that the method to extract \V-ub\ presented by the authors in hep-ph/99094 04, and modified in this Letter to include interference effects, is not jus t a refinement of the method introduced in hep-ph/9312311. We also discuss the model dependence of the latter proposal. Furthermore, we show that the resummation is not negligible and that the Landau pole does not introduce a ny significant uncertainties. (C) 2001 Published by Elsevier Science B.V.