====== TTP01-24 Non-perturbative effects in semi-leptonic B_c decays ======
 
 
   <hidden TTP01-24  Non-perturbative effects in semi-leptonic B_c decays > We discuss the impact of the soft degrees of freedom inside the B_c meson
 on its rate in the semi-leptonic decay B_c -> X l nu_l where X denotes
 light hadrons below the D^0 threshold. In particular we identify
 contributions involving soft hadrons which are non-vanishing in the limit
 of massless leptons. These contributions become relevant for a measurement
 of the purely leptonic B_c decay rate, which due to helicity suppression
 involves a factor m_l^2 and thus is much smaller than the contributions
 involving soft hadrons.
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|**T. Mannel, S. Wolf**  | 
|**  Phys. Rev.  D65 074012 2002  **  |
| {{preprints:2001:ttp01-24.pdf|PDF}} {{preprints:2001:ttp01-24.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0109250|arXiv]]   |
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