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arXiv 1003.4169hep-phnucl-th
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手征磁效应与QCD相变的有效模型

Chiral Magnetic Effect and QCD Phase Transitions with Effective Models

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

摘要:

研究了手征相变对手征磁效应的影响。计算了QCD相变过程中沿磁场方向的手征电流密度、反应平面两侧的电荷差以及方位角带电粒子关联随温度的变化。研究发现,随着温度的降低,手征电流密度、电荷差和方位角荷电粒子关联在手征相变的临界温度处都得到了突然的抑制,这是由于手征对称性破缺相中的大夸克组元质量对轴向反常和手征磁效应的抑制作用。我们认为,在RHIC能量扫描实验中,方位角的带电粒子关联(包括目前实验中所用的除以产生的带电粒子的总多重数的关联因子和另一种不除以总多重数的关联因子)可以用来识别QCD相变的发生。

英文摘要:

We study the influence of the chiral phase transition on the chiral magnetic effect. The chiral electric current density along the magnetic field, the electric charge difference between on each side of the reaction plane, and the azimuthal charged-particle correlations as functions of the temperature during the QCD phase transitions are calculated. It is found that with the decrease of the temperature, the chiral electric current density, the electric charge difference, and the azimuthal charged-particle correlations all get a sudden suppression at the critical temperature of the chiral phase transition, because the large quark constituent mass in the chiral symmetry broken phase quite suppresses the axial anomaly and the chiral magnetic effect. We suggest that the azimuthal charged-particle correlations (including the correlators divided by the total multiplicity of produced charged particles which are used in current experiments and another kind of correlators not divided by the total multiplicity) can be employed to identify the occurrence of the QCD phase transitions in RHIC energy scan experiments.

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