The rule of discarding 1/Nc in inclusive weak decays (I)

B. Blok, M. Shifman

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Abstract

We continue to investigate the effects of the (dominant) subleading operator of the σH 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-interferene 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 0.25 in B-mesons.

Original languageEnglish (US)
Pages (from-to)441-458
Number of pages18
JournalNuclear Physics, Section B
Volume399
Issue number2-3
DOIs
StatePublished - Jul 5 1993

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