Abstract
We calculate the radiative corrections to the nonleptonic inclusive B decay mode b → c ud taking into account the charm quark mass. Compared to the massless case, corrections resulting from a nonvanishing c quark mass increase the nonleptonic rate by (4–8)%, depending on the renormalization point. As a by-product of our calculation, we obtain an analytic expression for the radiative correction to the semileptonic decay b → uτ v taking into account the τ lepton mass, and estimate the c quark mass effects on the nonleptonic decay mode b → c cs .
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