轻离子碰撞中夸克偶素产生的ALICE实验研究
Quarkonium production in light-ion collisions with the ALICE experiment
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- University of Turin（都灵大学）
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中文总结 AI 辅助
本文利用ALICE实验在LHC首次采集的轻离子碰撞（OO和pO）数据，在前向快度区间测量粲偶素产生，并与理论模型比较，以研究QGP效应和再生机制。
中文摘要 AI 辅助
夸克偶素产生长期以来一直被认为是研究夸克-胶子等离子体（QGP）的金色探针之一。事实上，重夸克（ccbar）和（bbbar）的早期产生使得夸克偶素成为研究超相对论重离子碰撞中产生的热密介质演化的理想工具。在这种介质中，由于重夸克与反夸克之间束缚势的屏蔽和/或通过介质内相互作用，夸克偶素的产生预期会受到抑制。此外，在LHC能量下，不相关的粲夸克对的重新组合，即再生机制，被发现显著影响粲偶素观测量，这与抑制机制形成对比。另外，在如p-Pb等较小碰撞系统中的测量凸显了观察到类似QGP效应的可能性。在此背景下，在中等碰撞系统（如轻离子碰撞）中研究粲偶素产生变得越来越有趣，代表了检验最先进理论模型的理想试验场。本报告将展示利用2025年在LHC首次收集的轻离子碰撞数据（氧-氧（OO）、质子-氧（pO））得到的粲偶素产生的新测量结果。结果将利用ALICE前向快度覆盖范围（2.5 < y < 4）来展示。最后，这些测量结果将与现有的理论模型进行比较。
英文摘要
Quarkonium production has long been considered as one of the golden probes to study the quark-gluon plasma (QGP). In fact, the early production of heavy quarks (ccbar) and (bbbar) makes quarkonia an ideal tool to investigate the evolution of the hot and dense medium produced in ultra-relativistic heavy-ion collisions. In such a medium, quarkonium production is expected to be suppressed due to the screening of the binding potential between the heavy quark and antiquark and/or through in-medium interactions. Moreover, at LHC energies the recombination of uncorrelated charm quarks pairs, namely regeneration, was found to significantly affect charmonium observables, in contraposition to the suppression mechanism. In addition, measurements in smaller collision systems as p-Pb have highlighted the possibility to observe QGP-like effects. In this context, the study of charmonium production in intermediate collision systems, as light-ion collisions, becomes more and more interesting, representing an ideal test ground for the state-of-the art theoretical models. In this contribution the new measurements of charmonium production will be shown using the light-ion collisions data collected for the first time at the LHC in 2025 (oxygen-oxygen (OO), proton-oxygen (pO)). The results will be shown exploiting the forward ALICE rapidity coverage (2.5 < y < 4). Finally, the measurements will be compared with the existing theoretical models.
