Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-05-13
Commun.Theor.Phys. 39 (2003) 212-218
Physics
Nuclear Physics
Nuclear Theory
15 pages, 7 figures
Scientific paper
The energy and centrality dependences of charged particle pseudorapidity density in relativistic nuclear collisions were studied using a hadron and string cascade model, JPCIAE. Both the relativistic $p+\bar p$ experimental data and the PHOBOS and PHENIX $Au+Au$ data at RHIC energy could be fairly reproduced within the framework of JPCIAE model and without retuning the model parameters. The predictions for $Pb+Pb$ collisions at the LHC energy were also given. We computed the participant nucleon distributions using different methods. It was found that the number of participant nucleons is not a well defined variable both experimentally and theoretically. Thus it may be inappropriate to use the charged particle pseudorapidity density per participant pair as a function of the number of participant nucleons for distinguishing various theoretical models. A discussion for the effect of different definitions in nuclear radius (diffused or sharp) was given.
Bonasera Aldo
Cai Xu
Sa Ben-Hao
Tai An
Zhou Dai-Mei
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