2009/05/31 by C. Aubin, Christopher Aubin, Jack Laiho +1 · 1 citation
Mathematics · Physics and Astronomy · #Algorithm #High-Energy Particle Collisions Research #Lattice (music) #Lattice QCD #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #Valence (chemistry) #hep-lat #hep-ph
paper · pdf · doi:10.1103/physrevd.81.014507
published as Phys.Rev.D81:014507,2010 · 72 pages, 26 figures, 6 tables, uses RevTeX. Discussion about chiral/continuum extrapolation expanded for clarification, references added, conclusions remain unchanged, version published in Phys. Rev. D
openalex publication_date 2010/01/21 · arxiv created 2010/01/22 · arxiv updated 2010/04/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We calculate the neutral kaon mixing parameter BK 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\ensuremath≈0.12 fm and a\ensuremath≈0.09 fm. We match the lattice determination of BK to the continuum value using the nonperturbative method of Rome-Southampton, and extrapolate BK 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 BK; we find a value of BK^MS,NDR(2 GeV)=0.527(6)(21), where the first error is statistical and the second is systematic.