Subleading Light-cone distributions functions in the decays Lambda(b) --> X(s) Gamma and Lambda(b) --> X(u) Lepton Anti-Nu
Michael Kraetz, Thomas Mannel
Abstract
In this paper we investigate the subleading twist corrections to the photon energy spectrum in the decay Lambdab -> Xs γand to the lepton energy spectrum in Lambdab -> Xu l ν. As a first step we rederive the matching coefficients of the subleading twist using a much simpler method. Parametrizing the matrix elements for Lambdab and using reparametrization invariance, we show that the energy spectra close to the endpoints are given in terms of only a single universal function.
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