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28 March 2024
 
  » arxiv » hep-ph/0210248

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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 ;
Date 17 Oct 2002
Journal Phys.Lett. B556 (2003) 163-168 DOI: 10.1016/S0370-2693(03)00129-1
Subject hep-ph
AbstractIn this paper we investigate the subleading twist corrections to the photon energy spectrum in the decay Lambda_b -> X_s gamma and to the lepton energy spectrum in Lambda_b -> X_u l ar{ u}. As a first step we rederive the matching coefficients of the subleading twist using a much simpler method. Parametrizing the matrix elements for Lambda_b and using reparametrization invariance, we show that the energy spectra close to the endpoints are given in terms of only a single universal function.
Source arXiv, hep-ph/0210248
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