arXiv:hep-ph/0109250·v1·High Energy Physics — Phenomenology
Non-perturbative effects in semi-leptonic B_c decays
Th. Mannel (U. of Karlsruhe)🇩🇪 · St. Wolf (U. of Valencia)🇪🇸
Abstract
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.
Comments: LaTeX, 22 pages, 1 figure