B-Meson Decay Constants from Improved Lattice Nonrelativistic QCD with Physical u, d, s, and c Quarks

R. J. Dowdall, C. T. H. Davies, R. R. Horgan, C. J. Monahan, and J. Shigemitsu (HPQCD Collaboration)
Phys. Rev. Lett. 110, 222003 – Published 31 May 2013

Abstract

We present the first lattice QCD calculation of the decay constants fB and fBs with physical light quark masses. We use configurations generated by the MILC Collaboration including the effect of u, d, s, and c highly improved staggered quarks in the sea at three lattice spacings and with three u/d quark mass values going down to the physical value. We use improved nonrelativistic QCD (NRQCD) for the valence b quarks. Our results are fB=0.186(4)GeV, fBs=0.224(4)GeV, fBs/fB=1.205(7), and MBsMB=85(2)MeV, superseding earlier results with NRQCD b quarks. We discuss the implications of our results for the standard model rates for B(s)μ+μ and Bτν.

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  • Received 14 February 2013

DOI:https://doi.org/10.1103/PhysRevLett.110.222003

© 2013 American Physical Society

Authors & Affiliations

R. J. Dowdall1,2,*, C. T. H. Davies2,†, R. R. Horgan1, C. J. Monahan3, and J. Shigemitsu4 (HPQCD Collaboration)

  • 1DAMTP, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom
  • 2SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom
  • 3Physics Department, College of William and Mary, Williamsburg, Virginia 23187, USA
  • 4Physics Department, The Ohio State University, Columbus, Ohio 43210, USA

  • *R.J.Dowdall@damtp.cam.ac.uk
  • Christine.Davies@glasgow.ac.uk
  • http://www.physics.gla.ac.uk/HPQCD

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Vol. 110, Iss. 22 — 31 May 2013

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