Preasymptotic effects in beauty decays

Details Preasymptotic effects in beauty decays Preasymptotic effects in beauty decays

2000-01-27

arxiv.org/abs/hep-ph/0001280v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, talk given by B. Melic at The 3rd International Conference on B Physics and CP Violation, Taipei, Taiwan, December 3-

Scientific paper

Large preasymptotic effects in beauty decays have been found using heavy-quark and SU(3) symmetry, as well as experimental data on charmed hyperons. Contrary to rather uniform beauty-meson lifetimes, a much larger spread of beauty-baryon lifetimes is predicted. However, it is highly unlikely that, theoretically, the $ \tau(\Lambda_b)/\tau(B_d^0) $ ratio, which at present deviates more than $1\sigma$ from the experimental result, can be lowered below 0.9.

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