Enhancement of preasymptotic effects in inclusive beauty decays

Details Enhancement of preasymptotic effects in inclusive beauty decays Enhancement of preasymptotic effects in inclusive beauty decays

1999-07-23

arxiv.org/abs/hep-ph/9907468v1

Phys.Lett. B469 (1999) 253-258

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex2e, 12 pages, 3 eps figures included

Scientific paper

10.1016/S0370-2693(99)01198-3

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}) \sim 0.9 and the hierarchy of lifetimes \tau(\Lambda_{b}) \simeq \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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