Beauty hadron lifetime ratios and the problem of $τ(Λ_b)$

Details Beauty hadron lifetime ratios and the problem of $τ(Λ_b)$ Beauty hadron lifetime ratios and the problem of $τ(Λ_b)$

1997-06-04

arxiv.org/abs/hep-ph/9706245v1

Nucl.Phys.Proc.Suppl.65:185-188,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk presented at the Fifth Topical Seminar on The Irresistible Rise of the Standard Model, San Miniato, Italy, April 21-25, 1

Scientific paper

10.1016/S0920-5632(97)00998-5

We describe a theoretical approach to compute inclusive widths of heavy hadrons, based on a systematic expansion in the inverse powers of the heavy quark mass. The method reproduces quite well the experimental ratios of $B$ mesons lifetimes. As for $\tau(\Lambda_b)/\tau(B_d)$, we present a QCD sum rule calculation of the $O(m_b^{-3})$ contribution to $\tau(\Lambda_b)$; we conclude that such correction is not responsible of the small experimental value of $\tau(\Lambda_b)/\tau(B_d)$.

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