Noncritical fluctuations of (net) charges and (net) protons from the iEBE-VISHNU hybrid model
Noncritical fluctuations of (net) charges and (net) protons from the iEBE-VISHNU hybrid model
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iEBE-VISHNU 混合模型中（净）电荷和（净）质子的非临界波动
DOI：
10.1103/physrevc.97.014902
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发表时间：
2018
影响因子：
3.1
通讯作者：
Huichao Song
中科院分区：
文献类型：
--
作者：
Jixing Li;Hao-jie Xu;Huichao Song
本文在流体力学和UrQMD之间的粒子事件发生装置中加入泊松涨落的iEBE-VISHNU混合模型，研究了$\sqrt{s_{NN}}$ = 7.7、39和200gev下Au+Au碰撞中净电荷和净质子的非临界涨落。各种影响，如体积波动，强子演化和散射，共振衰减，以及现实的中心性切割和接受切割已经嵌入到我们的模型计算中。通过适当调整参数，iEBE-VISHNU粗略地描述了实验中测量到的（净）电荷和（净）质子的中心性相关矩和累积量。进一步的对比模拟表明，体积波动是影响多重波动的主要因素，这使得（净）电荷的高矩很大程度上偏离了毒药基线。我们还发现，强子演化和共振衰减对（净）电荷和（净）质子的多重涨落的影响非常小，甚至可以忽略不计。
In this paper, we investigate the non-critical fluctuations of (net) charges and (net) protons in Au+Au collisions at $\sqrt{s_{NN}}$ = 7.7, 39 and 200 GeV, using iEBE-VISHNU hybrid model with Poisson fluctuations added in the particle event generator between hydrodynamics and UrQMD. Various effects, such as volume fluctuations hadronic evolution and scatterings, resonance decays, as well as realistic centrality cuts and acceptance cuts have been embedded in our model calculations. With properly tuned parameters, iEBE-VISHNU roughly describe the centrality dependent moments and cumulants of (net) charges and (net) protons measured in experiment. Further comparison simulations show that the volume fluctuation is the dominant factor to influence the multiplicity fluctuations, which makes the higher moments of (net) charges largely deviate from the Poison baselines. We also find that the effects from hadronic evolutions and resonance decays are pretty small or even negligible for the multiplicity fluctuations of both (net) charges and (net) protons.