B-Meson Decay Constant from Unquenched Lattice QCD

Journal Article · Fri Nov 18 04:00:00 EST 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.212001· OSTI ID:20699576

Gray, Alan; Gulez, Emel; Shigemitsu, Junko ^[1]; Wingate, Matthew ^[2]; Davies, Christine T.H. ^[3]; Lepage, G Peter; Nobes, Matthew ^[4]; Mason, Quentin ^[5]

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1. Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States)
2. Institute for Nuclear Theory, University of Washington, Seattle, Washington 98195-1550 (United States)
3. Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ (United Kingdom)
4. Laboratory of Elementary Particle Physics, Cornell University, Ithaca, New York 14853 (United States)
5. Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge (United Kingdom)

We present determinations of the B-meson decay constant f{sub B} and of the ratio f{sub B{sub s}}/f{sub B} using the MILC Collaboration unquenched gauge configurations, which include three flavors of light sea quarks. The mass of one of the sea quarks is kept around the strange quark mass, and we explore a range in masses for the two lighter sea quarks down to m{sub s}/8. The heavy b quark is simulated using nonrelativistic QCD, and both the valence and sea light quarks are represented by the highly improved (AsqTad) staggered quark action. The good chiral properties of the latter action allow for a more accurate chiral extrapolation to physical up and down quarks than has been possible in the past. We find f{sub B}=216(9)(19)(4)(6) MeV and f{sub B{sub s}}/f{sub B}=1.20(3)(1)

• OSTI ID: 20699576
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 95; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
B QUARKS
CHIRALITY
D QUARKS
EXTRAPOLATION
FLAVOR MODEL
LATTICE FIELD THEORY
MASS
MEV RANGE 100-1000
PARTICLE DECAY
QUANTUM CHROMODYNAMICS
S QUARKS
U QUARKS
VALENCE