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

Bazavov, A. et al. (2010) Scaling studies of QCD with the dynamical highly improved staggered quark action. Physical Review D, 82(7), (doi:10.1103/PhysRevD.82.074501)

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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 ss̅ ” 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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Laiho, Dr John and DeTar, Professor Carleton
Authors: Bazavov, A., Bernard, C., DeTar, C., Freeman, W., Gottlieb, S., Heller, U., Hetrick, J., Laiho, J., Levkova, L., Oktay, M., Osborn, J., Sugar, R., Toussaint, D., and Van de Water, R.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:American Physical Society
ISSN (Online):1089-4918

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
481951Investigations in Quantum Chromodynamics and Physics Beyond the Standard ModelChristine DaviesScience & Technologies Facilities Council (STFC)ST/G00059X/1Physics and Astronomy