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arXiv 1607.01675hep-ph
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基于Dyson-Schwinger方程的精细截断的QCD相变

QCD phase transitions via a refined truncation of Dyson-Schwinger equations

Fei Gao, Yu-xin Liu

备注：
12 pages, 6 figures, 1 table
发表信息：
Phys. Rev. D 94, 076009 (2016)
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摘要：

我们在Dyson-Schwinger方程的精化方案中研究了QCD物质的手征和退禁闭相变，该方案成功地给出了介子质量谱，并将相互作用与从头计算结果进行了匹配.我们验证了不同磁化率定义的手征磁化率判据的等价性，并证实了手征磁化率判据不仅能有效地确定手征相界，而且能有效地确定临界终点（CEP），尤其是当不具有有效的旋光势时.我们提出了一个广义Schwinger函数的约束准则。我们给出了这两种相变的相图，并表明在改进的方案中CEP的位置移动到较低的化学势和较高的温度。根据我们的计算和以前的化学冻结条件的结果，我们提出CEP位于由$\sqrt{s_{NN}^{}}=9\sim15$ GeV的Au-Au碰撞产生的物质的状态。

英文摘要：

We investigate both the chiral and deconfinement phase transitions of QCD matter in a refined scheme of Dyson-Schwinger equations, which have been shown to be successful in giving the meson mass spectrum and matching the interaction with the results from ab initio computation. We verify the equivalence of the chiral susceptibility criterion with different definitions for the susceptibility and confirm that the chiral susceptibility criterion is efficient to fix not only the chiral phase boundary but also the critical end point (CEP), especially when one could not have the effective thermodynamical potential. We propose a generalized Schwinger function criterion for the confinement. We give the phase diagram of both phase transitions and show that in the refined scheme the position of the CEP shifts to lower chemical potential and higher temperature. Based on our calculation and previous results of the chemical freeze out conditions, we propose that the CEP locates in the states of the matter generated by the Au--Au collisions with $\sqrt{s_{NN}^{}}=9\sim15$ GeV.

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