Scaling and further tests of heavy meson decay constant determinations from nonrelativistic QCD

被引：19

作者：

Collins, S ^{[1
]}

Davies, CTH

Hein, J

Lepage, GP

Morningstar, CJ

Shigemitsu, J

Sloan, J

机构：

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

[2] Cornell Univ, Newman Lab Nucl Studies, Ithaca, NY 14853 USA

[3] Florida Int Univ, Dept Phys, Miami, FL 33199 USA

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

[5] Univ Kentucky, Dept Phys, Lexington, KY 40506 USA

来源：

PHYSICAL REVIEW D | 2001年 / 63卷 / 03期

关键词：

D O I：

10.1103/PhysRevD.63.034505

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present results for the B-s meson decay constant f(Bs) from simulations at three lattice spacings in the range a(-1) = 1.1 to 2.6 GeV using NRQCD heavy quarks and clover light quarks in the quenched approximation. We study the scaling of this quantity and check the consistency between mesons decaying from rest and from a state with a nonzero spatial momentum. The cancellation of power law contributions that arise in the NRQCD formulation of heavy-light currents is discussed. On the coarsest lattice the D-s meson decay constant f(Ds) is calculated. Our best values for the decay constants are given by f(Bs) = 187(4)(4)(11)(2)(7)(6) MeV and f(Ds) = 223(6)(31)(38)(23)(9)((+3)(-1)) MeV.

引用

页数：12

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