Dowdall, R.J., Davies, C.T.H. , Horgan, R.R., Monahan, C.J. and Shigemitsu, J. (2013) B-meson decay constants from improved lattice nonrelativistic QCD with physical u, d, s, and c quarks. Physical Review D, 110(22), p. 222003. (doi: 10.1103/PhysRevLett.110.222003) (PMID:23767714)
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Publisher's URL: http://dx.doi.org/10.1103/PhysRevLett.110.222003
Abstract
We present the first lattice QCD calculation of the decay constants <i>fB</i> and <i>fBs</i> with physical light quark masses. We use configurations generated by the MILC Collaboration including the effect of <i>u, d, s</i>, and <i>c</i> highly improved staggered quarks in the sea at three lattice spacings and with three <i>u/d</i> 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 MBs−MB=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.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Dowdall, Dr Rachel and Shigemitsu, Prof Junko and Davies, Professor Christine |
| Authors: | Dowdall, R.J., Davies, C.T.H., Horgan, R.R., Monahan, C.J., and Shigemitsu, J. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Physical Review D |
| Publisher: | American Physical Society |
| ISSN: | 1550-7998 |
| ISSN (Online): | 1550-2368 |
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