Document Type
Article
Department/Program
Physics
Journal Title
Physical Review Letters
Pub Date
2013
Volume
110
Issue
22
Abstract
We present the first lattice QCD calculation of the decay constants f(B) and f(Bs) 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(Bs) = 0.224(4) GeV, f(Bs) / f(B) = 1.205(7), and M-Bs - 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) ->mu(+)mu(-) and B ->tau nu
Recommended Citation
Dowdall, R. J.; Horgan, R. R.; Davies, C. T. H.; and Monahan, C. J., B-Meson Decay Constants from Improved Lattice Nonrelativistic QCD with Physical u,d,s, and c Quarks (2013). Physical Review Letters, 110(22).
10.1103/PhysRevLett.110.222003
DOI
10.1103/PhysRevLett.110.222003
