Extraction of|Vub|with reduced dependence on shape functions

Using BaBar measurements of the inclusive electron spectrum in B->X_u e nudecays and the inclusive photon spectrum in B->X_s gamma decays, we extract themagnitude of the CKM matrix element Vub. The extraction is based on theoreticalcalculations designed to reduce the theoretical uncertainties by exploiting theassumption that the leading shape functions are the same for all b->qtransitions (q is a light quark). The results agree well with the previousanalysis, have indeed smaller theoretical errors, but are presently limited bythe knowledge of the photon spectrum and the experimental errors on the leptonspectrum.Comment: 7 pages, 5 figures, 4 tables. The version submitted to Phys. Rev.