Enhancement of preasymptotic effects in inclusive beauty decays

Citation
B. Guberina et al., Enhancement of preasymptotic effects in inclusive beauty decays, PHYS LETT B, 469(1-4), 1999, pp. 253-258
Citations number
21
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
03702693 → ACNP
Volume
469
Issue
1-4
Year of publication
1999
Pages
253 - 258
Database
ISI
SICI code
0370-2693(199912)469:1-4<253:EOPEII>2.0.ZU;2-7
Abstract
We extend Voloshin's recent analysis of charmed and beauty hyperon decays b ased on SU(3) symmetry and heavy quark effective theory, by introducing a r ather 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 t au(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 Lamb da(b) by 22% and 35%, respectively. (C) 1999 Published by Elsevier Science B.V. All rights reserved.