Bs0-(B)over-bars0 mixing parameters from unquenched lattice QCD

被引：134

作者：

Dalgic, Emel

Gray, Alan

Gamiz, Elvira

Davies, Christine T. H.

Lepage, G. Peter

Shigemitsu, Junko

Trottier, Howard

Wingate, Matthew

机构：

[1] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[2] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[3] Cornell Univ, Lab Elementary Particle Phys, Ithaca, NY 14853 USA

[4] Simon Fraser Univ, Dept Phys, Vancouver, BC, Canada

[5] Univ Washington, Inst Nucl Theory, Seattle, WA 98195 USA

来源：

PHYSICAL REVIEW D | 2007年 / 76卷 / 01期

关键词：

D O I：

10.1103/PhysRevD.76.011501

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We determine hadronic matrix elements relevant for the mass and width differences, Delta M-s and Delta Gamma(s), in the B-s(0)-(B) over bar (0)(s) meson system using fully unquenched lattice QCD. We employ the MILC Collaboration gauge configurations that include u, d, and s sea quarks using the improved staggered quark (AsqTad) action and a highly improved gluon action. We implement the valence s quark also with the AsqTad action and use nonrelativistic QCD for the valence b quark. For the nonperturbative QCD input into the standard model expression for Delta M-s we find f(Bs)root(B) over bar (Bs)=0.281(21) GeV. Results for four-fermion operator matrix elements entering standard model formulas for Delta Gamma(s) are also presented.

引用

页数：5

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