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首页> 外文期刊>Fizika: A journal of experimental and theoretical physics, B. general physics, nuclear physics, particles and fields >THE KUGO-OJIMA CONFINEMENT CRITERION AND THE INFRARED BEHAVIOUR OF LANDAU GAUGE QCD
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THE KUGO-OJIMA CONFINEMENT CRITERION AND THE INFRARED BEHAVIOUR OF LANDAU GAUGE QCD

机译：KUGU-OJIMA约束准则和LANDAU GAUGE QCD的红外行为

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摘要

Recent investigations of the Dyson-Schwinger equations and Monte-Carlo latticecalculations resulted in a coherent description of the fully dressed gluon, ghost andquark propagators in Landau gauge QCD. In the Dyson-Schwinger approach, the infraredbehaviour of these propagators is determined analytically. For finite spacelike momentathe gluon, ghost and quark propagators are compared to available corresponding results oflattice Monte-Carlo calculations. For all three propagators, an almost quantitativeagreement is found. These results for the non-perturbative propagators allow an analyticalverification of the Kugo-Ojima confinement criterion. Our numerical analysis clearlyreveals positivity violation for the gluon propagator generated by a cut in the complexmomentum plane. The non-perturbative strong running coupling resulting from thesepropagators possesses an infrared fixed point. The quark propagator obtained from quenchedand unquenched calculations displays dynamical chiral symmetry breaking with quark massesclose to "phenomenological" and lattice values. We confirm that linearextrapolations of the quark propagator for different bare masses to the chiral limit areinaccurate.
机译：最近对Dyson-Schwinger方程和蒙特卡洛晶格计算的研究得出了Landau规QCD中完整的胶子，幻影和夸克传播子的连贯描述。在戴森-施温格（Dyson-Schwinger）方法中，这些传播器的红外行为是通过分析确定的。对于有限的空间矩矩，将胶子，重影和夸克传播子与蒙特卡洛晶格计算的可用对应结果进行比较。对于所有三个传播者，几乎都达成了定量协议。非扰动传播器的这些结果可以对Kugo-Ojima限制准则进行分析验证。我们的数值分析清楚地揭示了复杂动量平面上的切口所产生的胶子繁殖体的正性违规。这些传播器产生的非扰动的强运行耦合具有红外固定点。通过淬火和非淬火计算获得的夸克繁殖体显示出动态手性对称性，其夸克质量接近“现象学”和晶格值。我们确认夸克传播子对于不同裸质量至手性极限的线性外推是不准确的。

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