• Open Access

B-meson decay constants: A more complete picture from full lattice QCD

B. Colquhoun, C. T. H. Davies, J. Kettle, J. Koponen, A. T. Lytle, R. J. Dowdall, and G. P. Lepage (HPQCD Collaboration)
Phys. Rev. D 91, 114509 – Published 22 June 2015

Abstract

We extend the picture of B-meson decay constants obtained in lattice QCD beyond those of the B, Bs and Bc to give the first full lattice QCD results for the B*, Bs* and Bc*. We use improved nonrelativistic QCD for the valence b quark and the highly improved staggered quark (HISQ) action for the lighter quarks on gluon field configurations that include the effect of u/d, s and c quarks in the sea with u/d quark masses going down to physical values. For the ratio of vector to pseudoscalar decay constants, we find fB*/fB=0.941(26), fBs*/fBs=0.953(23) (both 2σ less than 1.0) and fBc*/fBc=0.988(27). Taking correlated uncertainties into account we see clear indications that the ratio increases as the mass of the lighter quark increases. We compare our results to those using the HISQ formalism for all quarks and find good agreement both on decay constant values when the heaviest quark is a b and on the dependence on the mass of the heaviest quark in the region of the b. Finally, we give an overview plot of decay constants for gold-plated mesons, the most complete picture of these hadronic parameters to date.

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  • Received 21 March 2015

DOI:https://doi.org/10.1103/PhysRevD.91.114509

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2015 American Physical Society

Authors & Affiliations

B. Colquhoun, C. T. H. Davies*, J. Kettle, J. Koponen, and A. T. Lytle

  • SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom

R. J. Dowdall

  • DAMTP, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom

G. P. Lepage

  • Laboratory of Elementary-Particle Physics, Cornell University, Ithaca, New York 14853, USA

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Vol. 91, Iss. 11 — 1 June 2015

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