QCD corrections and the end point of the lepton spectrum in semileptonic B decays.

Recently, Neubert has suggested that a certain class of nonperturbative corrections dominates the shape of the electron spectrum in the endpoint region of semileptonic B decay. Perturbative QCD corrections are important in the endpoint region. We study the effects of these corrections on Neubert’s proposal. The connection between the endpoint of the electron spectrum in semileptonic B decay and the photon spectrum in b → sγ is outlined. Typeset using REVTEX On leave from The Johns Hopkins University, Baltimore, Maryland