Net Charge Fluctuation and String Fragmentation

We present the simulation results of the net charge fluctuation in Au+Au collisions at /Snn=130 GeV froma dynamic model, JPCIAE, and its revisions. The simulations are done for the quark-gluon matter, the directly producedpions, the pion matter, and the hadron matter. The simulated net charge fluctuation of the quark-gluon matter is closeto the thermal model prediction for the quark-gluon gas. However, the discrepancy exists comparing the simulated netcharge fluctuation for directly produced pions and the pion matter with the thermal model prediction for pion gas andthe resonance pion gas, respectively. The net charge fluctuation of hadron matter from default JPCIAE simulations isnearly 3.5 times larger than quark-gluon matter. A discussion is given for the net charge fluctuation as an evidence ofQGP phase transition.

作 者： SA Ben-Hao CAI Xu TAI An ZHOU Dai-Mei   作者單位： SA Ben-Hao(China Institute of Atomic Energy, P.O. Box 275 (18), Beijing 102413, China;Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China;CCAST (World Lab.), P.O. Box 8730, Beijing 100080, China;Institute of Theoretical Physics, the Chines)

CAI Xu(Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China;CCAST (World Lab.), P.O. Box 8730, Beijing 100080, China)

TAI An(Department of Physics and Astronomy, University of California, at Los Angeles, Los Angeles, California 90095, USA)

ZHOU Dai-Mei(Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China) 

刊 名： 理論物理通訊(英文版)  ISTIC SCI 英文刊名： COMMUNICATIONS IN THEORETICAL PHYSICS  年，卷(期)： 2004 42(9)  分類號：   關鍵詞： net charge fluctuation dynamic model   quark-gluon matter  

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