Bound State Effects in Heavy Flavour Decay

Abstract

The study of weak decays of heavy flavoured particles is important as a source of information on many interesting aspects of the \(SU(3) \otimes SU(2) \otimes U(1)\) standard theory. Strong and electroweak effects all contribute to the determination of the decay properties. New light can be shed on new and old important problems like the understanding of parton dynamics, the riddle of non leptonic weak decays of strange particles and the determination of fundamental parameters in the theory as the K-M mixing angles. The inclusive (semileptonic and total) decay rates are especially important in that they are simplest and allow the least of model dependency. Many interesting problems are already found at this level, some of them not yet clarified, so that we shall concentrate on inclusive rates in this lecture. Due to limits of space in these proceedings I shall only cover some recent results [1,2] on bound state effects in the inclusive rates. These results refer to the charged lepton spectrum and the inclusive rate for semileptonic decay and to a quantitative study of the interference with the spectator in D+ non leptonic decays.