The Rule of Discarding 1/Nc in Inclusive Weak Decays. II
B. Blok, M. Shifman
Abstract
We calculate the leading preasymptotic correction to the inclusive width b→ c c s (two massive quarks in the final state) due to the operator σ H. It is found that this correction tends to cancel the 1/Nc part of the inclusive width calculated using naive factorization. The absolute value of the effect is of order 0.25. We also discuss how quark-hadron duality is realized in the inclusive decays.
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