TY - JOUR
T1 - Pseudoscalar decay constants, light-quark masses, and BK from mixed-action lattice QCD
AU - Laiho, Jack
AU - Van de Water, Ruth S.
N1 - Funding Information:
∗Funded by STFC and the Scottish Universities Physics Alliance. This manuscript has been authored by employees of Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Computations for this work were carried out with resources provided by the USQCD Collaboration, the Argonne Leadership Computing Facility, and the New York Center for Computational Sciences, which are funded by the Office of Science of the U.S. Department of Energy and by New York State.
Funding Information:
∗Funded by STFC and the Scottish Universities Physics Alliance. †Speaker. ‡This manuscript has been authored by employees of Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Computations for this work were carried out with resources provided by the USQCD Collaboration, the Argonne Leadership Computing Facility, and the New York Center for Computational Sciences, which are funded by the Office of Science of the U.S. Department of Energy and by New York State.
Publisher Copyright:
© Copyright owned by the author(s).
PY - 2011
Y1 - 2011
N2 - We present updated results for the leptonic decay constants fπ and fK, the light u, d, and s-quark masses, and the neutral kaon mixing parameter BK from mixed-action lattice simulations with staggered sea quarks and domain-wall valence quarks. We use the publicly-available 2+1 flavor MILC asqtad-improved staggered gauge configurations with multiple light sea-quark masses and three lattice spacings, and compute the kaon mixing matrix element with several partially-quenched valence-quark masses. We then extrapolate to the physical light-quark masses and the continuum using partially-quenched chiral perturbation theory formulated for mixed-action lattice simulations. For BK we match the lattice four-fermion operator to the continuum using the nonperturbative method of Rome-Southampton. Our new results benefit from two significant improvements over our published work: (1) we have added a third lattice spacing of a≈0.06 fm to better control the continuum extrapolation, and (2) we have implemented a new lattice renormalization scheme (the RI/SMOMγµ scheme developed by Sturm et al.) that suppresses chiral-symmetry breaking and other infrared effects and, in practice, also shrinks the size of the 1-loop perturbative coefficient needed to match to the continuum MS scheme. When combined with the use of volume-averaged momentum sources and twisted-boundary conditions, this significantly reduces the systematic uncertainty in the renormalization factor ZBK
AB - We present updated results for the leptonic decay constants fπ and fK, the light u, d, and s-quark masses, and the neutral kaon mixing parameter BK from mixed-action lattice simulations with staggered sea quarks and domain-wall valence quarks. We use the publicly-available 2+1 flavor MILC asqtad-improved staggered gauge configurations with multiple light sea-quark masses and three lattice spacings, and compute the kaon mixing matrix element with several partially-quenched valence-quark masses. We then extrapolate to the physical light-quark masses and the continuum using partially-quenched chiral perturbation theory formulated for mixed-action lattice simulations. For BK we match the lattice four-fermion operator to the continuum using the nonperturbative method of Rome-Southampton. Our new results benefit from two significant improvements over our published work: (1) we have added a third lattice spacing of a≈0.06 fm to better control the continuum extrapolation, and (2) we have implemented a new lattice renormalization scheme (the RI/SMOMγµ scheme developed by Sturm et al.) that suppresses chiral-symmetry breaking and other infrared effects and, in practice, also shrinks the size of the 1-loop perturbative coefficient needed to match to the continuum MS scheme. When combined with the use of volume-averaged momentum sources and twisted-boundary conditions, this significantly reduces the systematic uncertainty in the renormalization factor ZBK
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M3 - Conference Article
AN - SCOPUS:85053345448
SN - 1824-8039
VL - 139
JO - Proceedings of Science
JF - Proceedings of Science
T2 - 29th International Symposium on Lattice Field Theory, Lattice 2011
Y2 - 10 July 2011 through 16 July 2011
ER -