The B+ - B0d lifetime difference beyond leading logarithms

Martin Beneke, Gerhard Buchalla, Christoph Greub, Alexander Lenz, Ulrich Nierste

Research output: Contribution to journalArticlepeer-review

103 Scopus citations

Abstract

We compute perturbative QCD corrections to the lifetime splitting between the charged and neutral B meson in the framework of the heavy quark expansion. These next-to-leading logarithmic corrections are necessary for a meaningful use of hadronic matrix elements of local operators from lattice gauge theory. We find the uncertainties associated with the choices of renormalization scale and scheme significantly reduced compared to the leading-order result. We include the full dependence on the charm-quark mass mc without any approximations. Using hadronic matrix elements estimated in the literature with lattice QCD we obtain τ (B+)/τ(Bd0) = 1.053 ± 0.016 ± 0.017, where the effects of unquenching and 1/mb corrections are not yet included. The lifetime difference of heavy baryons Ξb0 and Ξb- is also briefly discussed.

Original languageEnglish
Pages (from-to)389-407
Number of pages19
JournalNuclear Physics, Section B
Volume639
Issue number1-2
DOIs
StatePublished - 9 Sep 2002
Externally publishedYes

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