Heavy Quark Expansions for Inclusive Heavy-Flavour Decays and the Lifetimes of Charm and Beauty Hadrons

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dc.creatorBigi, Ikaros I.
dc.date1996-12-09
dc.date1996-12-13
dc.date.accessioned2026-07-07T09:03:26Z
dc.date.available2026-07-07T09:03:26Z
dc.descriptionInclusive heavy-flavour decays can be described through $1/m_Q$ expansions derived from QCD with the help of an operator product expansion. I sketch their methodology and apply them first to semileptonic B decays; $|V(cb)|$ can be extracted from $Γ_{SL}(B)$ and $\bar B \to l νD^*$ with the result: $|V(cb)|_{incl} = 0.0413 \pm 0.0016_{exp} \pm 0.002_{theor}$, $|V(cb)|_{excl} = 0.0377 \pm 0.0016_{exp} \pm 0.002_{theor}$. The lifetimes of charm and beauty hadrons are discussed. The charm lifetimes are predicted/reproduced as well as could be expected. Predictions on B meson lifetimes agree with available data; $Λ_b$ baryons are predicted to be shorter lived than B_d mesons by no more than ~ 10% - in marked contrast to present measurements. I evaluate the situation and comment on recent theoretical criticism. The importance of the concepts of global vs. local quark-hadron duality is pointed out.
dc.descriptionLATEX, 27 pages,Invited Lecture given at HQ96 "Heavy Quarks at Fixed Target", St. Goar, Germany, Oct. 3 - 6, 1996, one reference added
dc.identifierhttps://arxiv.org/abs/hep-ph/9612293
dc.identifierhttp://arxiv.org/abs/hep-ph/9612293
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/149007
dc.subjectHigh Energy Physics - Phenomenology
dc.titleHeavy Quark Expansions for Inclusive Heavy-Flavour Decays and the Lifetimes of Charm and Beauty Hadrons
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