Scaling studies of QCD with the dynamical highly improved staggered quark action
Scaling studies of QCD with the dynamical highly improved staggered quark action
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具有动态高度改进的交错夸克作用的 QCD 的标度研究
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
R. V. D. Water
中科院分区：
文献类型：
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作者：
A. Bazavov;C. Bernard;C. DeTar;W. Freeman;S. Gottlieb;U. Heller;J. Hetrick;J. Laiho;L. Levkova;M. Oktay;J. Osborn;R. Sugar;D. Toussaint;R. V. D. Water
我们研究的晶格间距的依赖性，或缩放，物理量使用高度改进的交错夸克（HISQ）的HPQCD/UKQCD合作介绍的行动，比较我们的结果与asqtad费米子行动类似的模拟。结果是基于计算晶格间距约0.15，0.12，和0.09微米，使用四种口味的动态HISQ夸克。奇异夸克和魅夸克的质量接近它们的物理值，而光夸克的质量被设定为奇异夸克质量的0.2倍。我们着眼于强子质量，赝标介子衰变常数，和拓扑磁化率的晶格间距的依赖。除了常用的确定晶格间距通过静态夸克势，我们研究了一个决定提出的HPQCD合作，使用一个虚构的“未混合SS”赝标介子的衰变常数。我们发现，在相同的晶格间距和夸克质量下，HISQ模拟中的晶格伪影比asqtad模拟中的晶格伪影小得多。
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.