Azimuthal distributions of radial momentum and velocity in relativistic heavy ion collisions  

作　　者：里霖 李娜 吴元芳 

机构地区：[1]Institute of Particle Physics,Central China Normal University [2]Huazhong University of Science and Technology [3]Brookhaven National Laboratory [4]Key Laboratory of Quark & Lepton Physics (Huazhong Normal University),Ministry of Education

出　　处：《Chinese Physics C》2012年第5期423-428,共6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)

摘　　要：Azimuthal distributions of radial （transverse） momentum, mean radial momentum, and mean radial velocity of final-state particles are suggested for relativistic heavy ion collisions. Using the AMPT transport model with string melting, the distributions of Au＋Au collisions at 200 GeV are presented and studied. It is demonstrated that the distribution of total radial momentum is more sensitive to the anisotropic expansion, as the anisotropies of final-state particles and their associated transverse momentums are both counted in the measurement. The mean radial velocity distribution is compared with the radial flow velocity. The thermal motion contributes an isotropic constant to the mean radial velocity.Azimuthal distributions of radial （transverse） momentum, mean radial momentum, and mean radial velocity of final-state particles are suggested for relativistic heavy ion collisions. Using the AMPT transport model with string melting, the distributions of Au＋Au collisions at 200 GeV are presented and studied. It is demonstrated that the distribution of total radial momentum is more sensitive to the anisotropic expansion, as the anisotropies of final-state particles and their associated transverse momentums are both counted in the measurement. The mean radial velocity distribution is compared with the radial flow velocity. The thermal motion contributes an isotropic constant to the mean radial velocity.

关 键 词：azimuthal distribution radial momentum radial velocity 

分 类 号：O571.6[理学—粒子物理与原子核物理] P412.25[理学—物理]