Threshold Resummed Spectra in B -> Xu l nu Decays in NLO (I)
Abstract
We evaluate thresholds resummed spectra in B -> Xu l nu decays in next-to-leading order. We present results for the distribution in EX and in mX2/EX2, for the distribution in EX and El and for the distribution in EX, where EX and mX are the energy and the invariant mass of the final hadronic state Xu respectively and El is the energy of the charged lepton. We explicitly show that all these spectra (where there is no integration over the hadronic energy) can be directly related to the photon spectrum in B -> Xs gamma via short-distance coefficient functions.
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