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

Journal Article · Fri Oct 01 04:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.074501· OSTI ID:21432306

Bazavov, A; Freeman, W; Toussaint, D ^[1]; Bernard, C; Laiho, J ^[2]; DeTar, C; Levkova, L; Oktay, M ^[3]; Gottlieb, Steven ^[4]; Heller, U M ^[5]; Hetrick, J E ^[6]; Osborn, J ^[7]; Sugar, R L ^[8]; Van de Water, R S ^[9]

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1. Department of Physics, University of Arizona, Tucson, Arizona 85721 (United States)
2. Department of Physics, Washington University, St. Louis, Missouri 63130 (United States)
3. Physics Department, University of Utah, Salt Lake City, Utah 84112 (United States)
4. Department of Physics, Indiana University, Bloomington, Indiana 47405, USA and National Center for Supercomputing Applications, University of Illinois, Urbana, Illinois 61801 (United States)
5. American Physical Society, One Research Road, Ridge, New York 11961 (United States)
6. Physics Department, University of the Pacific, Stockton, California 95211 (United States)
7. Argonne Leadership Computing Facility, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
8. Department of Physics, University of California, Santa Barbara, California 93106 (United States)
9. Department of Physics, Brookhaven National Laboratory, Upton, New York 11973 (United States)

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 ss'' 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.

• OSTI ID: 21432306
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 82; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
COMPOSITE MODELS
CONSTRUCTIVE FIELD THEORY
D QUARKS
DECAY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
FLAVOR MODEL
HADRONS
LATTICE FIELD THEORY
MASS
MATHEMATICAL MODELS
MATHEMATICS
MESONS
PARTICLE DECAY
PARTICLE MODELS
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
QUARKS
S QUARKS
SCALING
SIMULATION
STRANGE PARTICLES
TOPOLOGY
U QUARKS