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arXiv 0910.5783hep-ph
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有效模型下有限温度下QCD中守恒电荷的涨落与关联

Fluctuations and Correlations of Conserved Charges in QCD at Finite Temperature with Effective Models

Wei-jie Fu, Yu-xin Liu, Yue-Liang Wu

摘要:

研究了有限温度下2 + 1味Polyakov-Nambu-Jona-Lasinio模型中重子数、电荷和奇异度等守恒电荷的涨落以及这些守恒电荷之间的关联.计算结果进行了比较,从最近的晶格计算与改进的交错费米子行动在两个值的晶格截断几乎物理的上下夸克质量和奇怪的夸克质量的物理值。我们发现,我们的计算结果与格点计算的结果一致,只是在与奇异夸克有关的涨落方面有一些定量的差别。计算结果表明,在相变的临界温度处,重子数的四次涨落与二次涨落之比$χ_{4}^{B}/χ_{2}^{B}$存在一个明显的尖点,从而证实了$χ_{4}^{B}/χ_{2}^{B}$是一个有用的探测去禁闭和手征相变的探针.

英文摘要:

We study fluctuations of conserved charges including baryon number, electric charge, and strangeness as well as the correlations among these conserved charges in the 2+1 flavor Polyakov--Nambu--Jona-Lasinio model at finite temperature. The calculated results are compared with those obtained from recent lattice calculations performed with an improved staggered fermion action at two values of the lattice cutoff with almost physical up and down quark masses and a physical value for the strange quark mass. We find that our calculated results are well consistent with those obtained in lattice calculations except for some quantitative differences for fluctuations related with strange quarks. Our calculations indicate that there is a pronounced cusp in the ratio of the quartic to quadratic fluctuations of baryon number, i.e. $χ_{4}^{B}/χ_{2}^{B}$, at the critical temperature during the phase transition, which confirms that $χ_{4}^{B}/χ_{2}^{B}$ is a useful probe of the deconfinement and chiral phase transition.

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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