标题： 带电粒子多重性涨落在RHIC和LHC能量下$A-A$碰撞中的研究使用Angantyr模型 显示英文标题

标题： Charged particle multiplicity fluctuation in $A-A$ collisions at RHIC and LHC energies using Angantyr model

摘要： 事件中带电粒子多重性的涨落被研究，针对Au$-$Au碰撞在 $\sqrt{s_{NN}}$ = 200 GeV，Pb$-$Pb碰撞在 $\sqrt{s_{NN}}$ = 2.76 TeV和5.02 TeV，使用Pythia 8 Angantyr模型。 研究了$\omega_{ch}$可观测量的中心性依赖性，该量通过缩放方差来量化涨落，并与从简单参与子叠加模型中获得的结果进行了比较。 发现$\omega_{ch}$低于参与子模型的预期。 这一估计将作为当前和未来在LHC能量下系统中事件中带电粒子多重性涨落测量的基准，此时没有形成夸克和胶子的去禁闭介质。 显示英文摘要

摘要： Event-by-event fluctuations of the charged particle multiplicity are studied for a wide range of centralities for Au$-$Au collisions at $\sqrt{s_{NN}}$ = 200 GeV, Pb$-$Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV and 5.02 TeV using the Pythia 8 Angantyr model. The centrality dependence of $\omega_{ch}$ observable, which quantifies the fluctuations in terms of scaled variance is studied for different pseudorapidity ranges and has been compared with those obtained from a simple participant superposition model. The $\omega_{ch}$ was found to be lower than the expectations from the participant model. The estimate would act like a baseline for current and future measurements of event-by-event fluctuations in the charged particle multiplicities in systems at LHC energies where no de-confined medium of quarks and gluons are formed.