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preprints:2002:ttp02-29 [2016/03/17 11:03] (current)
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| | ====== TTP02-29 Subleading Light-cone distributions functions in the decays $\Lambda_b \to X_s \gamma$ and $\Lambda_b \to X_u \ell \bar{\nu}_\ell$ ====== |
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| | <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. |
| | </hidden> |
| | |**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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