Quenched and first unquenched lattice HQET determination of the Bs-meson width difference

被引：15

作者：

Giménez, V

Reyes, J

机构：

[1] IFIC, Dept Fis Teor, E-46100 Burjassot, Valencia, Spain

[2] Univ Valencia, E-46100 Burjassot, Valencia, Spain

来源：

NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS | 2001年 / 94卷

关键词：

D O I：

10.1016/S0920-5632(01)00928-8

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 present recent results for the prediction of the B-s(0)-(B) over bar (0)(s) lifetime difference from lattice Heavy Quark Effective Theory simulations. In order to get a next-to-leading order result we have calculated the matching between QCD and HQET and the two-loop anomalous dimensions in the HQET for all the DeltaB=2 operators, in particular for the operators which enter the width difference. We present results from quenched and, for the first time, from unquenched simulations. We obtain for the B-s(0)-(B) over bar (0)(s) lifetime difference, Delta Gamma (Bs)/Gamma ((que.))(Bs) = (5.1 +/- 1.9 +/- 1.7) x 10(-2) and Delta Gamma (Bs)/Gamma ((unq))(Bs) = (4.3 +/- 2.0 +/- 1.9) x 10(-2) from the quenched and unquenched simulations respectively.

引用

页码：350 / 353

页数：4

共 15 条

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