Neutral B meson mixing in unquenched lattice QCD

被引：155

作者：

Gamiz, Elvira ^{[1
]}

Davies, Christine T. H. ^{[2
]}

Lepage, G. Peter ^{[3
]}

Shigemitsu, Junko ^{[4
]}

Wingate, Matthew ^{[5
]}

机构：

[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

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

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

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

[5] Univ Cambridge, Dept Appl Math & Theoret Phys, Cambridge CB3 0WA, England

来源：

PHYSICAL REVIEW D | 2009年 / 80卷 / 01期

关键词：

D O I：

10.1103/PhysRevD.80.014503

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study B-d and B-s mixing in unquenched lattice QCD employing the MILC Collaboration gauge configurations that include u, d, and s sea quarks based on the improved staggered quark (AsqTad) action and a highly improved gluon action. We implement the valence light quarks also with the AsqTad action and use the nonrelativistic NRQCD action for the valence b quark. We calculate hadronic matrix elements necessary for extracting Cabibbo-Kobayashi-Maskawa matrix elements from experimental measurements of mass differences Delta M-d and Delta M-s. We find xi equivalent to f(Bs)B(Bs)/f(Bd)B(Bd)=1.258(33), f(Bd)B(Bd)=216(15) MeV, and f(Bs)B(Bs)=266(18) MeV. We also update previous results for decay constants and obtain f(Bd)=190(13) MeV, f(Bs)=231(15) MeV, and f(Bs)/f(Bd)=1.226(26). The new lattice results lead to updated values for the ratio of Cabibbo-Kobayashi-Maskawa matrix elements |V-td|/|V-ts| and for the standard model prediction for Br(B-s ->mu(+)mu(-)) with reduced errors. We determine |V-td|/|V-ts|=0.214(1)(5) and Br(B-s ->mu(+)mu(-))=3.19(19)x10(-9).

引用

页数：12

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