1993/11/30 by I. I. Bigi, Nikolai Uraltsev, N. G. Uraltsev
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1007/bf01574165
published as Z.Phys.C62:623-632,1994 · 18 pages Preprint UND-HEP-93-BIG05, CERN-TH.7063/93; this is the revised version. Summary of changes: The discussion of uncertainties in the $1/m_Q$ expansion was shortend as the more detailed one was presented in our recent paper ref.[16] and is due in the forthcoming paper [17]. The sections 3 and 4 are then combined
arxiv created 1993/12/21 · openalex publication_date 1994/12/01 · arxiv updated 2010/11/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present some straightforward applications of the QCD heavy quark expansion, stated in previous papers [1-3], to the inclusive widths of heavy flavour hadrons. We address the question of the Ds lifetime and argue that -- barring Weak Annihilation (WA) -- τ(Ds) is expected to exceed τ(D0) by several percent; on the other hand WA could provide a difference of up to 10÷20% of \it any sign. We extract mc, mb and |Vcb| from Γ\indSL(D+) and Γ\indSL(B). The values of the quark masses are somewhat higher, but compatible with estimates from QCD sum rules; we obtain |Vcb|≃ 0.043 for τ(B)=1.4 psec and BRSL(B)=10.5% . We discuss the associated uncertainties in the 1/mQ expansion as well as some consequences for other electroweak decays.