Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2009-05-25
Phys.Rev.D81:014507,2010
Physics
High Energy Physics
High Energy Physics - Lattice
72 pages, 26 figures, 6 tables, uses RevTeX. Discussion about chiral/continuum extrapolation expanded for clarification, refer
Scientific paper
10.1103/PhysRevD.81.014507
We calculate the neutral kaon mixing parameter B_K in unquenched lattice QCD using asqtad-improved staggered sea quarks and domain-wall valence quarks. We use the "2+1" flavor gauge configurations generated by the MILC Collaboration, and simulate with multiple valence and sea quark masses at two lattice spacings of a ~ 0.12 fm and a ~ 0.09 fm. We match the lattice determination of B_K to the continuum value using the nonperturbative method of Rome-Southampton, and extrapolate B_K to the continuum and physical quark masses using mixed action chiral perturbation theory. The "mixed-action" method enables us to control all sources of systematic uncertainty and therefore to precisely determine B_K; we find a value of B_K^{MSbar, NDR}(2 GeV) = 0.527(6)(20), where the first error is statistical and the second is systematic.
Aubin Christopher
de Water Ruth S. Van
Laiho Jack
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