Subleading Light-cone distributions functions in the decays Lambda(b) --> X(s) Gamma and Lambda(b) --> X(u) Lepton Anti-Nu

Details Subleading Light-cone distributions functions in the decays Lambda(b) --> X(s) Gamma and Lambda(b) --> X(u) Lepton Anti-Nu Subleading Light-cone distributions functions in the decays Lambda(b) --> X(s) Gamma and Lambda(b) --> X(u) Lepton Anti-Nu

2002-10-17

arxiv.org/abs/hep-ph/0210248v2

Phys.Lett.B556:163-168,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

LATEX,The complete paper is also available via the www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/ . Discussion secti

Scientific paper

10.1016/S0370-2693(03)00129-1

In 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 \bar{\nu}. 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.

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