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arXiv 1107.0150hep-lat
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有限温度下静态重子的胶子轮廓

Gluonic profile of the static baryon at finite temperature

Ahmed S. Bakry, Derek B. Leinweber, Anthony G. Williams

摘要:

在纯SU(3)Yang-Mills理论中,我们揭示了有限温度下静态三夸克系统的胶子通量分布。一个作用量密度算符与三个代表重子态的Polyakov环相关联,其中一个对应于QCD平台末端附近的温度,T/T_c = 0.8,另一个对应于退禁闭点之前的温度,T/T_c = 0.9。夸克之间的短距离分离的通量分布显示出与填充的Delta形等值面一致的作用量密度剖面。然而,三角洲形的行动等值面分布被发现,即使在大的夸克间的两个温度的分离持续。在夸克平面上的作用密度分布表现出一种不均匀的模式,所有的夸克分离考虑。这一结果对比了著名的Y形均匀作用密度胶子通量轮廓使用威尔逊环作为夸克源运营商在零温度下。我们系统地测量和比较了三组等腰三角形夸克组态在两个温度标度下的通量分布剖面的主要方面。的半径,振幅和变化率的宽度的流量分布被发现,扭转其行为的温度增加,从QCD平台区的结束对解除禁闭点。值得注意的是,当T/T_c = 0.8时,夸克间距大于1.0 fm时,通量分布的均方宽度收缩并局部化,从而形成一个可识别的Y形半径轮廓。在去禁闭点附近,作用密度离域,并且在大的夸克间距处宽度线性加宽。

英文摘要:

The gluon flux distribution of a static three quark system has been revealed at finite temperature in the pure SU(3) Yang-Mills theory. An action density operator is correlated with three Polyakov loops representing the baryonic state at a temperatures near the end of the QCD plateau, T/T_c = 0.8, and another just before the deconfinement point, T/T_c = 0.9. The flux distributions at short distance separations between the quarks display an action-density profile consistent with a filled Delta shape iso-surface. However the Delta-shaped action iso-surface distributions are found to persist even at large inter-quark separations for both temperatures. The action density distribution in the quark plane exhibits a nonuniform pattern for all quark separations considered. This result contrasts the well-known Y-shaped uniform action density gluonic-flux profile obtained using the Wilson-loop as a quark source operator at zero temperature. We systematically measure and compare the main aspects of the profile of the flux distribution at the two considered temperature scales for three sets of isosceles triangle quark configurations. The radii, amplitudes and rate of change of the width of the flux distribution are found to reverse their behavior as the temperature increase from the end of the QCD plateau region towards the deconfinement point. Remarkably, we find the mean square width of the flux distribution shrinks and localizes for quark separations larger than 1.0 fm at T/T_c = 0.8 which results in an identifiable Y-shaped radius profile. Near the deconfinement point, the action-density delocalizes and the width broadens linearly at large quark separations.

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