arXiv 2001.119252020-01-31hep-exnucl-ex

用ALICE测量核-核碰撞中的夸克偶素

Quarkonium measurements in nucleus-nucleus collisions with ALICE

Xiaozhi Bai

DOI：: 10.1016/j.nuclphysa.2020.121769

摘要：

重夸克产生于核-核碰撞的早期阶段，因此可以提供对夸克-胶子等离子体（QGP）的重要认识。夸克偶素被认为是研究QGP的重要探针。重离子碰撞中重夸克夸克偶素产生的介质修正程度用核修正因子$R_{\rm AA}$来度量，定义为重离子碰撞中的夸克偶素产额除以pp碰撞中的相对夸克偶素截面，其中pp碰撞由核重叠函数标度。可能的路径长度依赖的夸克偶素解离，以及介质中重夸克（再）生成夸克偶素的贡献，将导致夸克偶素产生相对于反应平面的方位角各向异性。在这篇文章中，我们将讨论最近在$\sqrt{s_{\rm NN}}$ = 5.02 TeV的Pb-Pb碰撞中夸克偶素的ALICE测量，包括中快度和前快度。将显示$R_{\rm AA}$对J/ $ψ$、$Υ$（1 S）、$Υ$（2S）以及J/ $ψ$椭圆流$v_{2}$的中心性和$p_{\rm T}$的依赖性。实验数据和当前的理论模型计算也将进行讨论。

英文摘要：

Heavy quarks are produced in the early stages of nucleus-nucleus collisions and can therefore provide important insight into the Quark-Gluon Plasma (QGP). Quarkonia are proposed as crucial probes to study the QGP. The extent of the medium modification for heavy-quark quarkonium production in heavy-ion collisions is measured in terms of a nuclear modification factor $R_{\rm AA}$, defined as the quarkonium yield in heavy-ion collisions divided by the relative quarkonium cross section in pp collisions scaled by the nuclear overlap function. A possible path-length dependent quarkonium dissociation, as well as a contribution of (re-)generation of quarkonia from heavy quarks in the medium, would lead to an azimuthal anisotropy of quarkonium production relative to the reaction plane. In this contribution, the recent ALICE measurements of quarkonium in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV will be discussed for both mid- and forward rapidity. The dependence of $R_{\rm AA}$ on centrality and $p_{\rm T}$ for J/$ψ$, $Υ$(1S), $Υ$(2S), as well as the J/$ψ$ elliptic flow $v_{2}$ will be shown. The experimental data and the current theoretical model calculations will be also discussed.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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