System size in relativistic heavy ion collisions  

作　　者：王洋洋 赵琳捷 袁中升 张丹丹 方炜 许明梅 

机构地区：[1]College of Physical Science and Technology,Huazhong Normal University [2]Institute of Particle Physics,Huazhong Normal University [3]Key Lab of Quark and Lepton Physics (Huazhong Normal University),Ministry of Education

出　　处：《Chinese Physics C》2011年第3期264-268,共5页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10775056, 10835005, 11005045)

摘　　要：System size is more than a geometrical quantity in relativistic heavy ion collisions; it is closely related to evolution process, i.e. a different system size corresponds to a different evolution process, and whether QGP is produced depends on the system size. We propose that the system size should be under the same level when comparing the measurements from different colliding nuclei. The equivalence of the peripheral collisions of Au-Au and the central collisions of smaller nuclei is studied using the Monte Carlo method. Comparing the transverse overlapping area of the colliding nuclei, the number of participant nucleons and the number of nucleon-nucleon binary collisions in various colliding nuclei, we give an estimate of the correspondence in system size. This is helpful in the experimental comparison of the measurements from different colliding nuclei.System size is more than a geometrical quantity in relativistic heavy ion collisions; it is closely related to evolution process, i.e. a different system size corresponds to a different evolution process, and whether QGP is produced depends on the system size. We propose that the system size should be under the same level when comparing the measurements from different colliding nuclei. The equivalence of the peripheral collisions of Au-Au and the central collisions of smaller nuclei is studied using the Monte Carlo method. Comparing the transverse overlapping area of the colliding nuclei, the number of participant nucleons and the number of nucleon-nucleon binary collisions in various colliding nuclei, we give an estimate of the correspondence in system size. This is helpful in the experimental comparison of the measurements from different colliding nuclei.

关 键 词：relativistic heavy ion collisions system size 

分 类 号：O571.6[理学—粒子物理与原子核物理] TN791[理学—物理]