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 — preprints:2002:ttp02-29 [2016/03/17 11:03] (current) Line 1: Line 1: + ====== 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. + ​ + |**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]] ​  | + | |