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

被引：120
|
作者：
Dowdall, R. J. [1 ,2 ]
Davies, C. T. H. [2 ]
Horgan, R. R. [1 ]
Monahan, C. J. [3 ]
Shigemitsu, J. [4 ]
机构：
[1] Univ Cambridge, DAMTP, Cambridge CB3 0WA, England
[2] Univ Glasgow, Sch Phys & Astron, SUPA, Glasgow G12 8QQ, Lanark, Scotland
[3] Coll William & Mary, Dept Phys, Williamsburg, VA 23187 USA
[4] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA
来源：
PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 22期
关键词：
D O I：
10.1103/PhysRevLett.110.222003
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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
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页数：5
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