====== TTP02-29 Subleading Light-cone distributions functions in the decays $\Lambda_b \to X_s \gamma$ and $\Lambda_b \to X_u \ell \bar{\nu}_\ell$ ======
 
 
   <hidden TTP02-29  Subleading Light-cone distributions functions in the decays $\Lambda_b \to X_s \gamma$ and $\Lambda_b \to X_u \ell \bar{\nu}_\ell$ > 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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|**Michael Kraetz and Thomas Mannel**  | 
|**  Phys.Lett.  B556 163-168 2003  **  |
| {{preprints:2002:ttp02-29.pdf|PDF}} {{preprints:2002:ttp02-29.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0210248|arXiv]]   |
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