Non-perturbative effects in semi-leptonic Bc decays
Th. Mannel, St. Wolf
Abstract
We discuss the impact of the soft degrees of freedom inside the Bc meson on its rate in the semi-leptonic decay Bc -> X l nul where X denotes light hadrons below the D0 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 Bc decay rate, which due to helicity suppression involves a factor ml2 and thus is much smaller than the contributions involving soft hadrons.
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