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Dowdall RJ, Davies CT, Horgan RR, et al. B-meson decay constants from improved lattice nonrelativistic QCD with physical u, d, s, and c quarks. Phys Rev Lett. 2013;110(22):222003doi: 10.1103/PhysRevLett.110.222003.
Dowdall, R. J., Davies, C. T., Horgan, R. R., Monahan, C. J., Shigemitsu, J. (2013). B-meson decay constants from improved lattice nonrelativistic QCD with physical u, d, s, and c quarks. Physical review letters, 110(22), 222003. https://doi.org/10.1103/PhysRevLett.110.222003
Dowdall, R J, et al. "B-meson decay constants from improved lattice nonrelativistic QCD with physical u, d, s, and c quarks." Physical review letters vol. 110,22 (2013): 222003. doi: https://doi.org/10.1103/PhysRevLett.110.222003
Dowdall RJ, Davies CT, Horgan RR, Monahan CJ, Shigemitsu J. B-meson decay constants from improved lattice nonrelativistic QCD with physical u, d, s, and c quarks. Phys Rev Lett. 2013 May 31;110(22):222003. doi: 10.1103/PhysRevLett.110.222003. Epub 2013 May 31. PMID: 23767714.
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Phys Rev Lett. 2013 May 31;110(22):222003. doi: 10.1103/PhysRevLett.110.222003. Epub 2013 May 31.

B-meson decay constants from improved lattice nonrelativistic QCD with physical u, d, s, and c quarks.

Physical review letters

R J Dowdall, C T H Davies, R R Horgan, C J Monahan, J Shigemitsu,

Affiliations

  1. DAMTP, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom. [email protected]

PMID: 23767714 DOI: 10.1103/PhysRevLett.110.222003

Abstract

We present the first lattice QCD calculation of the decay constants f(B) and f(B(s)) 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 f(B)=0.186(4) GeV, f(B(s))=0.224(4) GeV, f(B(s))/f(B)=1.205(7), and M(B(s))-M(B)=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 B→τν.

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