Net charge fluctuation and string fragmentation
Ben-Hao Sa, Xu Cai, an Tai, Zhong-Qi Wang, Dai-Mei Zhou
Abstract
We present simulation results of net charge fluctuation in Au+Au collisions at snn=130 GeV from a dynamic model, JPCIAE. The calculations are done for the quark-gluon phase before hadronization, the pion gas, the resonance pion gas from ρ and ω decays and so on. The simulations of the charge fluctuation show that the discrepancy exists between the dynamic model and the thermal model for a pion gas and a resonance pion gas from ρ and ω decays while the simulated charge fluctuation of the quark-gluon phase is close to the thermal model prediction. JPCIAE results of net charge fluctuation in the hardonic phase are nearly 4-5 times larger than one for the quark-gluon phase, which implies that the charge fluctuation in the quark-gluon phase may not survive the hadronization (string fragmentation) as implemented in JPCIAE.
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