Subleading Light-cone distributions functions in the decays Lambda(b) --> X(s) Gamma and Lambda(b) --> X(u) Lepton Anti-Nu
High Energy Physics - Phenomenology
2011-01-27 v2
Abstract
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.
Cite
@article{arxiv.hep-ph/0210248,
title = {Subleading Light-cone distributions functions in the decays Lambda(b) --> X(s) Gamma and Lambda(b) --> X(u) Lepton Anti-Nu},
author = {Michael Kraetz and Thomas Mannel},
journal= {arXiv preprint arXiv:hep-ph/0210248},
year = {2011}
}
Comments
LATEX,The complete paper is also available via the www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/ . Discussion section improved