Guberina, Branko; Melić, Blaženka; Štefančić, Hrvoje
Enhancement of preasymptotic effects in inclusive beauty decays.
Physics Letters B, 469
We extend Voloshin's recent analysis of charmed and beauty hyperon decays based on SU(3) symmetry and heavy quark effective theory, by introducing a rather moderate model-dependence, in order to obtain more predictive power, e.g. the values of lifetimes of the (Lambda(b), Xi(b)) hyperon triplet and the lifetime of Omega(b). In this way we obtain an improvement of the ratio tau(Lambda(b))/tau(B-d(0)) similar to 0.9 and the hierarchy of lifetimes tau(Lambda(b)) similar or equal to tau(Xi(b)(0)) < tau(Xi(b)(-)) < tau(Omega(b)) with lifetimes of Xi(b)(-) and Omega(b) exceeding the lifetime of Lambda(b) by 22% and 35%, respectively.
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