The Rule of Discarding 1/Nc in Inclusive Weak Decays
B. Blok, M. Shifman
Abstract
We continue to investigate the effects of the (dominant) subleading operator of the σ H type in the 1/Nc parts of the weak nonleptonic amplitudes. If the previous work concentrated on exclusive decays now we analyse inclusive widths in a certain kinematic limit. Deviations from the parton model predictions are found due to soft-gluon color exchange. In the interference (i.e. 1/Nc) terms they are stronger than in the non-interference terms. The sign is negative so that the 1/Nc parts tend to cancel. The absolute value of the effect is of order 1 in D-mesons and of order 0.50 in B mesons.
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