文章基本信息

标题：Theoretical progress in describing the B-meson lifetimes
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作者：D. Becirevic
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2001
卷号：2001
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The present status of the theoretical estimates of the di erence between the widths of the neutral Bs-mesons and of the B-meson lifetime ratios is reviewed. In particular, the lattice results for the matrix elements of the relevant B = 2 operators are updated and the rst lattice QCD results for the matrix elements of B = 0 operators are presented. In both cases, the NLO perturbative QCD corrections in the coecient functions have been included. The theoretically updated results are: (􀀀=􀀀)Bs = 74 %, (B+)=(Bd) = 1:07(3) and (Bs)=(Bd) = 1:00(2).