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The B+−Bd0 lifetime difference beyond leading logarithms

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


Martin Beneke

Gerhard Buchalla

Christoph Greub

Alexander Lenz

Ulrich Nierste


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(B0d)=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 Ξ0b and Ξ−b is also briefly discussed.


Beneke, M., Buchalla, G., Greub, C., Lenz, A., & Nierste, U. (2002). The B+−Bd0 lifetime difference beyond leading logarithms. Nuclear Physics B, 639(1-2), 389-407.

Journal Article Type Article
Acceptance Date Jul 3, 2002
Publication Date Sep 9, 2002
Deposit Date Dec 7, 2015
Publicly Available Date Feb 17, 2016
Journal Nuclear Physics B
Print ISSN 0550-3213
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 639
Issue 1-2
Pages 389-407


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