Decay constants of B-mesons from non-perturbative HQET with two light dynamical quarks

被引：27

作者：

Bernardoni, Fabio ^{[1
]}

Blossier, Benoit ^{[2
]}

Bulava, John ^{[3
]}

Della Morte, Michele ^{[4
,5
,6
]}

Fritzsch, Patrick ^{[7
]}

Garron, Nicolas ^{[3
]}

Gerardin, Antoine ^{[2
]}

Heitger, Jochen ^{[8
]}

von Hippel, Georg ^{[9
]}

Simma, Hubert ^{[1
]}

Sommer, Rainer ^{[1
]}

机构：

[1] NIC DESY, D-15738 Zeuthen, Germany

[2] Univ Paris 11, Phys Theor Lab, F-91405 Orsay, France

[3] Univ Dublin Trinity Coll, Sch Math, Dublin 2, Ireland

[4] Univ Southern Denmark, Origins & Danish IAS CP3, DK-5230 Odense M, Denmark

[5] IFIC, Valencia 46980, Spain

[6] CSIC, Valencia 46980, Spain

[7] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany

[8] Univ Munster, Inst Theoret Phys, D-48149 Munster, Germany

[9] Johannes Gutenberg Univ Mainz, Inst Kernphys, PRISMA Cluster Excellence, D-55099 Mainz, Germany

来源：

PHYSICS LETTERS B | 2014年 / 735卷

关键词：

Lattice QCD; Heavy Quark Effective Theory; Bottom quarks; Meson decay; EFFECTIVE FIELD-THEORY; CHIRAL PERTURBATION-THEORY; HEAVY; MASS;

D O I：

10.1016/j.physletb.2014.06.051

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a computation of B-meson decay constants from lattice QCD simulations within the framework of Heavy Quark Effective Theory for the b-quark. The next-to-leading order corrections in the HQET expansion are included non-perturbatively. Based on N-f = 2 gauge field ensembles, covering three lattice spacings a approximate to (0.08-0.05) fm and pion masses down to 190 MeV, a variational method for extracting hadronic matrix elements is used to keep systematic errors under control. In addition we perform a careful autocorrelation analysis in the extrapolation to the continuum and to the physical pion mass limits. Our final results read f(B) = 186(13) MeV, f(Bs) = 224(14) MeV and f(Bs)/f(B) = 1.203(65). A comparison with other results in the literature does not reveal a dependence on the number of dynamical quarks, and effects from truncating HQET appear to be negligible. (C) 2014 The Authors. Published by Elsevier B.V.

引用

页码：349 / 356

页数：8

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