$\sNN=5.02$~TeV核-核碰撞中$\Wpm$和PDMATHAAB产生的中心性依赖和同位旋效应
Centrality dependence and isospin effect on $\Wpm$ and $\Zn$ productions in nucleus-nucleus collisions at $\sNN=5.02$~TeV
摘要：
本文用部分子和强子级联模型PACIAE研究了$\sNN=5.02$~TeV的Pb-Pb碰撞中$\Zn$和$\Wpm$的中心性依赖产生以及$\Wpm$产生中的同位旋效应。用ALICE方法计算了$\sNN=5.02$~TeV的Pb-Pb碰撞产生$\Zn$的数据，得到了较好的再现.对同一碰撞体系中$\Wpm$的产生也作了预测。在探索$\Wp$和$\Wm$之间的电荷不对称性时，观察到一个有趣的同位旋效应，该电荷不对称性是质量中心能量为5.02 TeV的从小到大的碰撞系统中的$u$-和$d$-夸克的价数之间的不对称性的函数。这些结果为理解重离子碰撞的初始条件提供了重要的基准。
英文摘要：
In this paper, the centrality dependent $\Zn$ and $\Wpm$ production and the isospin effect in $\Wpm$ production are investigated with a parton and hadron cascade model PACIAE in Pb--Pb collisions at $\sNN=5.02$~TeV. ALICE data of $\Zn$ production in Pb--Pb collisions at $\sNN=5.02$~TeV are found to be reproduced fairly well. The prediction on $\Wpm$ production in the same collision system is given as well. An interesting isospin effect is observed in exploring the charge asymmetry between $\Wp$ and $\Wm$ as a function of the asymmetry between number of valence $u$- and $d$-quarks varied from small to large collision systems at center-of-mass energy 5.02 TeV. The results serve as a important benchmarks for understanding the initial conditions of heavy-ion collisions.
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