Characterizing variable for the critical point in momentum space  

作　　者：杜佳欣 柯宏伟 许明梅 刘连寿 

机构地区：[1]Institute of Particle Physics, Huazhong Normal University [2]Key Laboratory of Quark & Lepton Physics (Huazhong Normal University), Ministry of Education

出　　处：《Chinese Physics C》2009年第8期655-660,共6页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10775056, 10835005)

摘　　要：The possible experimentally observable signal in momentum space for the critical point, which is free from the contamination of statistical fluctuations, is discussed. It is shown that the higher order scaled moment of transverse momentum can serve as an appropriate signal for the critical point, provided the transverse momentum distribution has a sudden change when energy increases passing through this point. A 2-D percolation model with a linear temperature gradient is constructed to check this suggestion. A sudden change of third order scaled moment of transverse momentum is observed.The possible experimentally observable signal in momentum space for the critical point, which is free from the contamination of statistical fluctuations, is discussed. It is shown that the higher order scaled moment of transverse momentum can serve as an appropriate signal for the critical point, provided the transverse momentum distribution has a sudden change when energy increases passing through this point. A 2-D percolation model with a linear temperature gradient is constructed to check this suggestion. A sudden change of third order scaled moment of transverse momentum is observed.

关 键 词：relative heavy ion collision phase transition critical end point transverse momentum scaled moments 

分 类 号：O572.2[理学—粒子物理与原子核物理]