Scaling studies of QCD with the dynamical highly improved staggered quark action

A. Bazavov, C. Bernard, C. Detar, W. Freeman, Steven Gottlieb, U. M. Heller, J. E. Hetrick, J. Laiho, L. Levkova, M. Oktay, J. Osborn, R. L. Sugar, William D Toussaint, R. S. Van De Water

Research output: Contribution to journalArticle

118 Citations (Scopus)

Abstract

We study the lattice spacing dependence, or scaling, of physical quantities using the highly improved staggered quark (HISQ) action introduced by the HPQCD/UKQCD Collaboration, comparing our results to similar simulations with the asqtad fermion action. Results are based on calculations with lattice spacings approximately 0.15, 0.12, and 0.09 fm, using four flavors of dynamical HISQ quarks. The strange and charm quark masses are near their physical values, and the light-quark mass is set to 0.2 times the strange-quark mass. We look at the lattice spacing dependence of hadron masses, pseudoscalar meson decay constants, and the topological susceptibility. In addition to the commonly used determination of the lattice spacing through the static quark potential, we examine a determination proposed by the HPQCD Collaboration that uses the decay constant of a fictitious "unmixed ss̄" pseudoscalar meson. We find that the lattice artifacts in the HISQ simulations are much smaller than those in the asqtad simulations at the same lattice spacings and quark masses.

Original languageEnglish (US)
Article number074501
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume82
Issue number7
DOIs
StatePublished - Oct 5 2010

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quantum chromodynamics
quarks
scaling
spacing
mesons
simulation
decay
artifacts
fermions
magnetic permeability

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Bazavov, A., Bernard, C., Detar, C., Freeman, W., Gottlieb, S., Heller, U. M., ... Van De Water, R. S. (2010). Scaling studies of QCD with the dynamical highly improved staggered quark action. Physical Review D - Particles, Fields, Gravitation and Cosmology, 82(7), [074501]. https://doi.org/10.1103/PhysRevD.82.074501

Scaling studies of QCD with the dynamical highly improved staggered quark action. / Bazavov, A.; Bernard, C.; Detar, C.; Freeman, W.; Gottlieb, Steven; Heller, U. M.; Hetrick, J. E.; Laiho, J.; Levkova, L.; Oktay, M.; Osborn, J.; Sugar, R. L.; Toussaint, William D; Van De Water, R. S.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 82, No. 7, 074501, 05.10.2010.

Research output: Contribution to journalArticle

Bazavov, A, Bernard, C, Detar, C, Freeman, W, Gottlieb, S, Heller, UM, Hetrick, JE, Laiho, J, Levkova, L, Oktay, M, Osborn, J, Sugar, RL, Toussaint, WD & Van De Water, RS 2010, 'Scaling studies of QCD with the dynamical highly improved staggered quark action', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 82, no. 7, 074501. https://doi.org/10.1103/PhysRevD.82.074501
Bazavov, A. ; Bernard, C. ; Detar, C. ; Freeman, W. ; Gottlieb, Steven ; Heller, U. M. ; Hetrick, J. E. ; Laiho, J. ; Levkova, L. ; Oktay, M. ; Osborn, J. ; Sugar, R. L. ; Toussaint, William D ; Van De Water, R. S. / Scaling studies of QCD with the dynamical highly improved staggered quark action. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2010 ; Vol. 82, No. 7.
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