arXiv 1708.048882017-08-27hep-ph

重子数涨落与QCD相结构

Baryon number fluctuations and QCD phase structure

Guo-yun Shao, Zhan-duo Tang, Xue-yan Gao, Wei-bo He

摘要：

研究了Polyakov圈改进的Nambu-Jona-Lasinio（PNJL）模型中强相互作用物质的相结构和重子数涨落。计算表明，手征跃迁和退禁闭跃迁以及它们的重合和分离决定了QCD的基本相结构。净重子峰度和偏度的等值线图和三维图很好地反映了QCD相结构的轨迹。通过与实验数据的比较，我们发现手性跃迁临界终点（CEP）的存在是解释净质子峰态能量依赖性非单调和偏离泊松基线的关键.特别地，在交叉区的手征跃迁和解除禁闭跃迁之间的关系也反映在重子数涨落中。研究表明，测量守恒电荷多重数分布的高阶矩对于研究临界性，甚至交叉区的手征跃迁和解除禁闭跃迁都是非常有效的。

英文摘要：

We investigate the phase structure of strongly interacting matter and baryon number fluctuations in the Polyakov loop improved Nambu--Jona-Lasinio (PNJL) model. The calculation shows that both the chiral and deconfinement transitions, as well as their coincidence and separation determine the basic QCD phase structure. The contour maps and the three-dimensional diagrams of the net-baryon kurtosis and skewness present well the trace of QCD phase structure. Comparing with the experimental data, we find that the existence of a critical end point (CEP) of chiral transition is crucial to explain the non-monotonic energy dependence and the large deviation from Poisson baseline of net-proton kurtosis. In particular, the relation between the chiral and deconfinement transitions in the crossover region is also reflected by the baryon number fluctuations. This study shows that the measurements of higher moments of multiplicity distributions of conserved charges are powerful to investigate the criticality and even the chiral and deconfinement transitions in the crossover region.

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英文摘要：

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