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Preasymptotic effects in beauty decays

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arxiv hep-ph/0001280 v2 pith:DNVSREDW submitted 2000-01-27 hep-ph

Preasymptotic effects in beauty decays

classification hep-ph
keywords beautydecayseffectsexperimentallifetimespreasymptoticbeauty-baryonbeauty-meson
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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