Investigating baryon-strangeness and charge-strangeness correlations in Pb$-$Pb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV with ALICE

arXiv - PHYS - Nuclear Experiment Pub Date : 2024-09-17 DOI:arxiv-2409.10939

Swati Sahafor the ALICE Collaboration

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Abstract

To explore the quantum chromodynamics (QCD) phase transitions and the properties of quark$-$gluon plasma, the ALICE collaboration at CERN has conducted an extensive analysis of the correlations among net-conserved quantities, namely net-baryon, net-charge, and net-strangeness. These correlations are essential for understanding the QCD phase structure, as they are directly connected to ratios of thermodynamic susceptibilities calculated in lattice QCD. This analysis focuses on the correlations between net-kaon and net-proton, as well as net-kaon and net-charge, in Pb$-$Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV, where net-proton and net-kaon serve as effective proxies for net-baryon and net-strangeness, respectively. A comparison with theoretical predictions from the Thermal-FIST model sheds light on the role of resonance decays and the effects of charge conservation laws in shaping these correlations. Furthermore, the measurements show sensitivity to the correlation volume in which these conservation laws are applied, underscoring the importance of modeling the underlying dynamics to fully understand the experimental results on fluctuations and correlations in heavy-ion collisions.

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用ALICE研究在$\sqrt{s_\mathrm{NN}}$ = 5.02 TeV的Pb$-$Pb对撞中的重子-斯特朗性和电荷-斯特朗性相关性

为了探索量子色动力学（QCD）相变和夸克-胶子等离子体的性质，欧洲核子研究中心的 ALICE 合作小组对净保留量（即净重子、净电荷和净斯特朗性）之间的相关性进行了广泛的分析。这些相关性对于理解 QCD 相结构至关重要，因为它们与晶格 QCD 中计算出的热力学易感性比率直接相关。本分析的重点是在$\sqrt{s_\mathrm{NN}} = 5.02$ TeV的Pb$-$Pb对撞中，净质子和净质子之间以及净质子和净电荷之间的相关性，其中净质子和净质子分别是净重子和净斯特朗性的有效替代物。通过与热-FIST 模型的理论预测进行比较，我们发现了共振衰变的作用以及电荷守恒定律在形成这些相关性方面的影响。此外，测量结果还显示了对应用这些守恒定律的相关体积的敏感性，这突出了建立基本动力学模型对于充分理解重离子碰撞中的波动和相关实验结果的重要性。

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arXiv - PHYS - Nuclear Experiment

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