Transverse momentum and transverse mass distributions of charged hadrons produced in Au-Au collisions at high energies  

作　　者：刘福虎 

机构地区：[1]Institute of Theoretical Physics,Shanxi University

出　　处：《Chinese Physics B》2008年第7期2458-2465,共8页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos 10675077 and 10275042);the Shanxi Provincial Natural Science Foundation of China (Grant No 2007011005);the Shanxi Provincial Foundation of China for Returned Overseas Scholars

摘　　要：The transverse momentum distribution and the transverse mass distribution of charged hadrons produced in nucleus nucleus collisions at high energies are described by using a two-cylinder model. The results calculated by the model are compared and found to be in agreement with the experimental data of the STAR and E895 Collaborations, measured in A^Au collisions at the relativistic heavy ion collider （RHIC） and alternating-gradient synchrotron （AGS） energies, respectively. In the energy range concerned, the excitation degree of emission source close to the central axis of cylinders increases obviously with the collision centrality and incident energy increasing, but it does not show any obvious change with the increase of the （pseudo）rapidity in central collisions. The excitation degree of emission source close to the side-surface of cylinders does not show any obvious change with the collision centrality, the （pseudo）rapidity, and the incident energy increasing.The transverse momentum distribution and the transverse mass distribution of charged hadrons produced in nucleus nucleus collisions at high energies are described by using a two-cylinder model. The results calculated by the model are compared and found to be in agreement with the experimental data of the STAR and E895 Collaborations, measured in A^Au collisions at the relativistic heavy ion collider （RHIC） and alternating-gradient synchrotron （AGS） energies, respectively. In the energy range concerned, the excitation degree of emission source close to the central axis of cylinders increases obviously with the collision centrality and incident energy increasing, but it does not show any obvious change with the increase of the （pseudo）rapidity in central collisions. The excitation degree of emission source close to the side-surface of cylinders does not show any obvious change with the collision centrality, the （pseudo）rapidity, and the incident energy increasing.

关 键 词：transverse momentum two-cylinder model nucleus-nucleus collisions 

分 类 号：O572.24[理学—粒子物理与原子核物理]