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arXiv 1010.0892hep-ph
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QCD热力学中守恒电荷的四阶关联

Fourth-order Correlations of Conserved Charges in the QCD Thermodynamics

Wei-jie Fu, Yue-liang Wu

摘要:

在有限温度和非零重子化学势条件下,研究了重子数、电荷和奇异度等守恒电荷的四阶关联。结果表明,随着重子化学势的增大,四阶关联在手征交叉过程中变化迅速,并出现三个极值。当系统向QCD临界点移动时,极值的绝对值趋于无穷大,在临界点处四阶关联发散。给出了四阶关联在温度和重子化学势平面上的等值线图。我们注意到,除了$χ_{13}^{BS}$和$χ_{13}^{QS}$外,所有的四阶守恒电荷关联都是探索重离子碰撞实验中QCD临界点的很好探针。

英文摘要:

The fourth-order correlations of conserved charges, such as the baryon number, electric charge, and strangeness, are studied at finite temperature and nonzero baryon chemical potential in an effective model. It is found that the fourth-order correlations change rapidly and have three extrema during the chiral crossover with the increase of the baryon chemical potential. The absolute values of the extrema approach infinity when the thermodynamical system moves toward the QCD critical point and the fourth-order correlations are divergent at the critical point. The contour plots of the fourth-order correlations in the plane of the temperature and baryon chemical potential are given. It is noticed that all the fourth-order correlations of conserved charges, except for $χ_{13}^{BS}$ and $χ_{13}^{QS}$, are excellent probes to explore the QCD critical point in heavy ion collision experiments.

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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