B-Meson Decay Constant from Unquenched Lattice QCD
- Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States)
- Institute for Nuclear Theory, University of Washington, Seattle, Washington 98195-1550 (United States)
- Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ (United Kingdom)
- Laboratory of Elementary Particle Physics, Cornell University, Ithaca, New York 14853 (United States)
- 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, Vol. 95, Issue 21; Other Information: DOI: 10.1103/PhysRevLett.95.212001; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). HPQCD Collaboration; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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