有效模式中粒子-反粒子尺度相关的评价
Evaluation of particle--anti-particle scaled correlation within effective models
摘要：
物理量的相关性和涨落在相变和临界现象中起着重要的作用。近年来，在束流能量扫描计划的范围内进行了一些实验尝试，以定位QCD相图中可能的临界点。本文利用Nambu-Jona-Lasinio模型研究了非对角夸克磁化率，它与平均场水平上的夸克-反夸克标度关联有关。我们发现，这种相关性有一个显着的峰值附近的临界点，因此，可能是一个有用的量在实验中测量。我们进一步研究了排斥矢量耦合的影响，它降低了临界点附近的标度相关的强度。
英文摘要：
Correlations and fluctuations of physical quantities are known to play an important role in phase transitions and critical phenomena. In recent years some experimental attempts were made in the scope of the Beam Energy Scan program to locate a possible critical point in the QCD phase diagram. In this work we use the Nambu--Jona-Lasinio model to investigate the off-diagonal quark susceptibility, which is related to the quark--anti-quark scaled correlation at the mean field level. We show that this correlation has a significant peak near the critical point and, therefore, may be a useful quantity to measure in experiment. We further study the effects of a repulsive vector coupling, which reduces the strength of the scaled correlation near the critical point.
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