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

Physical Review Letters, ISSN: 0031-9007, Vol: 110, Issue: 22, Page: 222003
2013
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Article Description

We present the first lattice QCD calculation of the decay constants f and fB 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=0.186(4) GeV, fB=0.224(4) GeV, fB/f =1.205(7), and MB-M=85(2) MeV, superseding earlier results with NRQCD b quarks. We discuss the implications of our results for the standard model rates for B→μμ and B→τν. © 2013 American Physical Society.

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