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arXiv 2401.04355hep-phhep-lat
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粲夸克对N_f=2+1+1全息QCD中手征相变的影响

The effect of charm quark on chiral phase transition in $N_f=2+1+1$ holographic QCD

Hiwa A. Ahmed, Mamiya Kawaguchi, Mei Huang

AI总结:

本研究基于四味软壁全息QCD模型,探究有限温度下粲夸克对轻夸克手征相变的影响,揭示不同夸克质量条件下相变级次的变化规律并绘制扩展的Columbia相图,还讨论了相关临界指数。

摘要:

我们基于四味软壁全息QCD模型,研究了有限温度下粲夸克对轻夸克手征相变的影响。在无质量极限下,我们发现四夸克味系统中的热手征相变是二级相变。当存在有质量粲夸克以及无质量轻夸克和奇异夸克时,相变的级次转变为一级,这是由于夸克味对称性破缺,而该破缺与U(1)轴矢量对称性的破坏相关。一旦轻夸克和奇异夸克获得质量,显式手征对称性破缺变得显著,此时在物理夸克质量下实现了交叉相变。我们还在夸克质量平面上绘制了相变相图,其中轻夸克和奇异夸克质量简并但与粲夸克质量不同。该相图是传统Columbia图向四夸克味系统的扩展。我们还讨论了与手征相变相关的临界指数。

英文摘要:

We investigate the effect of charm quark on the chiral phase transition of light quarks at finite temperature based on the four-flavor soft-wall holographic QCD model. In the massless limit, we find that the thermal chiral phase transition is of the second order in the four-quark flavor system. In the case with the massive charm quark and the massless light and strange quarks, the order of the phase transition changes to the first order. This is due to the quark flavor symmetry breaking which is associated with the violation of the $U(1)$ axial symmetry. Once the light and strange quarks get massive, the explicit chiral symmetry breaking becomes eminent, then the crossover phase transition is realized at the physical quark masses. We also map the order of the phase transition on a phase diagram in the quark mass plane where the light- and strange-quark masses are degenerate but differ from the value of the charm quark mass. This phase diagram is an extension of the conventional Columbia plot to the four-quark flavor system. The critical exponents related to the chiral phase transition are also addressed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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