Note on the Extraction of |Vub| using Radiative B Decays
Abstract
The element |Vub| of the quark mixing matrix can be extracted with small theoretical uncertainties by combining weighted integrals over the endpoint regions of the lepton spectrum in B -> Xu l nu decays and the photon spectrum in B -> Xs gamma decays. The perturbative corrections to this determination are computed at next-to-leading order including operator mixing, which has an important impact. The effect of Sudakov resummation is shown to be numerically insignificant.
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