Na, H., Monahan, C.J., Davies, C.T.H. , Horgan, R., Lepage, G.P. and Shigemitsu, J. (2012) B and B_{s} meson decay constants from lattice QCD. Physical Review D, 86(3), 034506. (doi: 10.1103/PhysRevD.86.034506)
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Abstract
We present a new determination of the B and Bs meson decay constants using nonrelativistic quantum chromodynamics (NRQCD) b-quarks, highly improved staggered quark (HISQ) light and strange valence quarks and the MILC collaboration Nf=2+1 lattices. The new calculations improve on HPQCD’s earlier work with NRQCD b-quarks by replacing AsqTad with HISQ valence quarks, by including a more chiral MILC fine ensemble in the analysis, and by employing better tuned quark masses and overall scale. We find fB=0.191(9) GeV, fBs=0.228(10) GeV and fBs/fB=1.188(18). Combining the new value for fBs/fB with a recent very precise determination of the Bs meson decay constant based on HISQ b-quarks, fBs=0.225(4) GeV, leads to fB=0.189(4) GeV. With errors of just 2.1% this represents the most precise fB available today.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Shigemitsu, Prof Junko and Davies, Professor Christine |
| Authors: | Na, H., Monahan, C.J., Davies, C.T.H., Horgan, R., Lepage, G.P., 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 |
| Published Online: | 21 August 2012 |
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