An explanation for deviations from the quark number scaling of elliptic flows in low P_T region  

作　　者：姚涛 谢去病 邵凤兰 

机构地区：[1]Department of Physics,Shandong University,Jinan 250100,China [2]Department of Physics,Qufu Normal University,Qufu 273165,China

出　　处：《Chinese Physics C》2008年第5期356-362,共7页中国物理C（英文版）

基　　金：National Natural Science Foundation of China(10475049,10775089)

摘　　要：We carry out a systematic study of the different contributions to the deviations of the elliptic flows from the quark number scaling in high energy heavy ion collision in a quark combination model. The effects that we considered are： the resonance decay, the flavor dependence of the quark elliptic flow and the combination of quarks/antiquarks with slightly different transverse momenta. Our results show that the deviations observed in experiments can be well reproduced within the combination framework if all the three effects are considered. We make a detailed analysis of the different contributions using a Monte-Carlo program and suggest measuring the quark number scaling in intermediate PT range more precisely.We carry out a systematic study of the different contributions to the deviations of the elliptic flows from the quark number scaling in high energy heavy ion collision in a quark combination model. The effects that we considered are： the resonance decay, the flavor dependence of the quark elliptic flow and the combination of quarks/antiquarks with slightly different transverse momenta. Our results show that the deviations observed in experiments can be well reproduced within the combination framework if all the three effects are considered. We make a detailed analysis of the different contributions using a Monte-Carlo program and suggest measuring the quark number scaling in intermediate PT range more precisely.

关 键 词：elliptic flow the quark number scaling quark combination model mass hierarchy 

分 类 号：O572.33[理学—粒子物理与原子核物理]