Journal
PHYSICS LETTERS B
Volume 735, Issue -, Pages 349-356Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2014.06.051
Keywords
Lattice QCD; Heavy Quark Effective Theory; Bottom quarks; Meson decay
Funding
- Deutsche Forschungsgemeinschaft [SFB/TR 9, HE 4517/2-1, HE 4517/3-1]
- European Community through EU FLAVIAnet [MRTN-CT-2006-035482]
- Spanish Ministry of Education and Science projects [RyC-2011-08557]
- Federal Ministry of Education and Research (BMBF)
- German State Ministries for Research of Baden-Wurttemberg (MWK)
- Bayern (StMWFK)
- Nordrhein-Westfalen (MIWF)
- Distributed European Computing Initiative [PRACE-2IP]
- European Community's Seventh Framework Programme [RI-283493]
- Grand Equipement National de Calcul Intensif at CINES in Montpellier [2012-056808]
- HLRN in Berlin
- NIC at DESY, Zeuthen
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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.
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