The B+-Bd0 lifetime difference beyond leading logarithms

被引：82

作者：

Beneke, M

Buchalla, G

Greub, C

Lenz, A

Nierste, U

机构：

[1] Rhein Westfal TH Aachen, Inst Theoret Phys E, D-52074 Aachen, Germany

[2] CERN, Div Theory, CH-1211 Geneva 23, Switzerland

[3] Univ Bern, Inst Theoret Phys, CH-3012 Bern, Switzerland

[4] Univ Regensburg, Fak Phys, D-93040 Regensburg, Germany

[5] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

来源：

NUCLEAR PHYSICS B | 2002年 / 639卷 / 1-2期

关键词：

D O I：

10.1016/S0550-3213(02)00561-8

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

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 m(o) without any approximations. Using hadronic matrix elements estimated in the literature with lattice QCD we obtain tau(B+)/tau(B-d(0)) = 1.053 +/- 0.016 +/- 0.017, where the effects of unquenching and 1/m(b) corrections are not yet included. The lifetime difference of heavy baryons Xi(b)(0) and Xi(b)(-) is also briefly discussed. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：389 / 407

页数：19

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