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Color screening in (2+1)-flavor QCD

机译:(2 + 1)口味QCD中的颜色筛选

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We study correlation functions of spatially separated static quark-antiquark pairs in ( 2 + 1 )-flavor QCD in order to investigate onset and nature of color screening at high temperatures. We perform lattice calculations in a wide temperature range, 140 ≤ T ≤ 5814 ? ? MeV , using the highly improved staggered quark action and several lattice spacings to control discretization effects. By comparing at high temperatures our lattice results to weak-coupling calculations, as well as to the zero temperature result for the energy of a static quark-antiquark pair, we observe that color screening sets in at r T ≈ 0.3 . Furthermore, we also observe that in the range 0.3 ? r T ? 0.6 weak-coupling calculations in the framework of suitable effective field theories provide an adequate picture of color screening.
机译:我们研究(2 +1)味QCD中空间分离的静态夸克-反夸克对的相关函数,以研究高温下彩色筛查的发生和性质。我们在140≤T≤5814?的宽温度范围内执行晶格计算。 ? MeV,使用高度改进的交错夸克动作和几个晶格间距来控制离散化效果。通过在高温下比较,我们的晶格结果与弱耦合计算以及静态夸克-反夸克对的能量的零温度结果相比较,我们观察到颜色筛选的起始点为r T≈0.3。此外,我们还观察到在0.3? T在适当的有效场论框架内的0.6弱耦合计算可提供足够的色彩筛选效果。

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