Journal
PHYSICAL REVIEW D
Volume 86, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.86.034506
Keywords
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Funding
- DOE [DE-FG02-91ER40690, DE-FG02-04ER41302, DE-AC02-06CH11357]
- NSF [PHY-0757868]
- STFC
- Office of Science of the DOE
- Ohio Supercomputer Center
- BIS
- STFC [ST/J000434/1, ST/G000581/1, ST/J000442/1, ST/H00887X/1, ST/G00059X/1] Funding Source: UKRI
- Division Of Physics
- Direct For Mathematical & Physical Scien [757868] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/H00887X/1, ST/G00059X/1, ST/J000442/1, ST/G000581/1, ST/J000434/1] Funding Source: researchfish
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We present a new determination of the B and B-s meson decay constants using nonrelativistic quantum chromodynamics (NRQCD) b-quarks, highly improved staggered quark (HISQ) light and strange valence quarks and the MILC collaboration N-f = 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 f (B) = 0.191(9) GeV, f (Bs) = 0.228(10) GeV and f (Bs)/f (B) = 1.188(18). Combining the new value for f (Bs)/f (B) with a recent very precise determination of the B-s meson decay constant based on HISQ b-quarks, f (Bs) = 0.225(4) GeV, leads to f (B) = 0.189(4) GeV. With errors of just 2.1% this represents the most precise f (B) available today.
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