Energy and Centrality Dependences of Charged Multiplicity Pseudorapidity Density in Relativistic Nuclear Collisions

ZHOU Dai-Mei; SA Ben-Hao; LU Zhong-Dao; CAI Xu

Chinese Physics C> 2002, Vol. 26> Issue(10) : 1072-1077

Energy and Centrality Dependences of Charged Multiplicity Pseudorapidity Density in Relativistic Nuclear Collisions

Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China2 China Institute of Atomic Energy, Beijing 102413, China

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Abstract：
Using a hadron and string cascade model, JPCIAE, and the corresponding Monte Carlo events generator, the energy and centrality dependences of charged particle pseudorapidity density in relativistic nuclear collisions were studied. Within the framework of this model, both the relativistic pp experimental data and the PHOBOS and PHENIX Au+Au data could be reproduced fairly well without retuning the model parameters. This paper shows that since part> is not a well defined physical variable both experimentally and theoretically, the charged particle pseudorapidity density per participant pair can increase and also can decrease with increasing of part>, so it may be hard to use charged particle pseudorapidity density per participant pair as a function of part> to distinguish various theoretical models for particle production.

References

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ZHOU Dai-Mei, SA Ben-Hao, LU Zhong-Dao and CAI Xu. Energy and Centrality Dependences of Charged Multiplicity Pseudorapidity Density in Relativistic Nuclear Collisions[J]. Chinese Physics C, 2002, 26(10): 1072-1077.

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Received: 2001-12-17
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Energy and Centrality Dependences of Charged Multiplicity Pseudorapidity Density in Relativistic Nuclear Collisions

Corresponding author: ZHOU Dai-Mei,

Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China2 China Institute of Atomic Energy, Beijing 102413, China

Received Date: 2001-12-17

Accepted Date: 1900-01-01

Available Online: 2002-10-05

Abstract: Using a hadron and string cascade model, JPCIAE, and the corresponding Monte Carlo events generator, the energy and centrality dependences of charged particle pseudorapidity density in relativistic nuclear collisions were studied. Within the framework of this model, both the relativistic pp experimental data and the PHOBOS and PHENIX Au+Au data could be reproduced fairly well without retuning the model parameters. This paper shows that since part> is not a well defined physical variable both experimentally and theoretically, the charged particle pseudorapidity density per participant pair can increase and also can decrease with increasing of part>, so it may be hard to use charged particle pseudorapidity density per participant pair as a function of part> to distinguish various theoretical models for particle production.

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Energy and Centrality Dependences of Charged Multiplicity Pseudorapidity Density in Relativistic Nuclear Collisions

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