Cumulants in the 3-dimensional Ising, O(2) and O(4) spin models  

作　　者：潘雪 陈丽珠 陈晓松 吴元芳 

机构地区：[1]Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University [2]Institute of Theoretial Physics, Chinese Academy of Sciences

出　　处：《Chinese Physics C》2013年第12期38-42,共5页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(10835005);MOE of China(IRT0624,B08033) and Laboratory of Quarkand Lepton Physics(MOE);Institute of Particle Physics,Central China Normal University,Wuhan 430079,China(QLPL201303)

摘　　要：Based on the universal properties of a critical point in different systems and that the QCD phase transitions fall into the same universality classes as the 3-dimensional Ising, O（2） or O（4） spin models, the critical behavior of cumulants and higher cumulant ratios of the order parameter from the three kinds of spin models is studied. We found that all higher cumulant ratios change dramatically the sign near the critical temperature. The qualitative critical behavior of the same order cumulant ratio is consistent in these three models.Based on the universal properties of a critical point in different systems and that the QCD phase transitions fall into the same universality classes as the 3-dimensional Ising, O（2） or O（4） spin models, the critical behavior of cumulants and higher cumulant ratios of the order parameter from the three kinds of spin models is studied. We found that all higher cumulant ratios change dramatically the sign near the critical temperature. The qualitative critical behavior of the same order cumulant ratio is consistent in these three models.

关 键 词：QCD critical point chiral phase transition universality class higher cumulant ratios O（N） spinmodels 

分 类 号：O571.6[理学—粒子物理与原子核物理]