论文标题
重新审视相对论重型离子碰撞中的中心性定义和可观察到的中心性依赖性
Revisiting the centrality definition and observable centrality dependence of relativistic heavy-ion collisions in PACIAE model
论文作者
论文摘要
我们改善了Paciae模型影响参数的中心性定义，该模型响应了Alice，Atlas和CMS协作报告的事实，即重离子碰撞中的最大影响参数应将其扩展到20美元的FM $。同时，Paciae计划将在一个统一的程序版本中研究基本核碰撞，质子核碰撞和核核碰撞的新版本Paciae 2.2.2。新的影响参数定义与光学Glauber模型计算的影响参数箱，$ n_ {part} $，以及质子 - 核核的$ n_ {coll} $在相对性能量处的质子 - 核和核核核糖碰撞，与改进的MC-Glauber模型在误差bar内的改进MC-Glauber模型一致。 $ \ sqrt {s _ {\ rm nn}} = 5.02 $ paciae 2.2.2模拟的pb-pb碰撞中的带电粒子伪塔和横向动量分布。
We improve the centrality definition in impact parameter in PACIAE model responding the fact reported by the ALICE, ATLAS, and CMS collaborations that the maximum impact parameter in heavy ion collisions should be extended to 20 $fm$. Meanwhile the PACIAE program is updated to a new version of PACIAE 2.2.2 with convenience of studying the elementary nuclear collisions, proton-nucleus collisions, and the nucleus-nucleus collisions in one unified program version. The new impact parameter definition together with the optical Glauber model calculated impact parameter bin, $N_{part}$, and $N_{coll}$ in proton-nucleus and nucleus-nucleus collisions at relativistic energies are consistent with the improved MC-Glauber model ones within the error bar. The charged-particle pseudorapidity and the transverse momentum distributions in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV simulated by PACIAE 2.2.2 well reproduce the ALICE experimental data.
