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Inclusive charmed-baryon decays and lifetimes

We have quantitatively reanalyzed the inclusive charmed-baryon decays. New ingredients are the Voloshin preasymptotic effects in semileptonic decays and the Cabibbo-subleading contributions to both semileptonic and nonleptonic decays. It has been found that the Cabbibo-subleading Voloshin contribution essentially improves the theoretical semileptonic branching ratio of Lambda /sub c//sup +/, in agreement with experiment. The semileptonic branching ratios for Xi /sub c//sup +/ and Omega /sub c//sup 0/ are found to be large, i.e., of the order of 20%. The lifetimes hierarchy is in a good qualitative and even quantitative agreement with experiment except for the Xi /sub c//sup +/ lifetime, which is somewhat smaller than the experimental value. Future measurements, especially measurements of the semileptonic branching ratios for Omega /sub c//sup 0/, Xi /sub c//sup +/ and Xi /sub c//sup 0/ should be decisive for the check of this approach.

inclusive charmed-baryon decays; charmed-baryon lifetimes; preasymptotic effects

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