The B+−Bd0 lifetime difference beyond leading logarithms

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

doi:10.1016/s0550-3213(02)00561-8

The B+−Bd0 lifetime difference beyond leading logarithms

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

Authors

Martin Beneke

Gerhard Buchalla

Christoph Greub

Alexander Lenz

Ulrich Nierste

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(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.

Citation

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. https://doi.org/10.1016/s0550-3213%2802%2900561-8

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
DOI	https://doi.org/10.1016/s0550-3213%2802%2900561-8