19.6 GeV与200 GeV能量下金核-金核碰撞中短寿命共振态的可重建性与定向流
Reconstructability and directed flow of short-lived resonances in Au+Au collisions at 19.6 and 200 GeV
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中文总结 AI 辅助
本研究基于UrQMD模型系统研究金核-金核碰撞中短寿命共振态的可重建性与定向流，发现可重建性主要由共振态寿命决定，强子演化对末态定向流有重要影响，为相对论重离子碰撞共振态研究提供新见解。
中文摘要 AI 辅助
我们基于UrQMD（超相对论量子分子动力学）输运模型，对金核-金核碰撞中强子共振态的可重建性与定向流开展了系统研究。本工作的核心目标是探究强子演化阶段如何同时影响共振态可重建性与末态定向流。\n 我们研究了一组短寿命强子共振态，包括$\rho^0$、$K^{*0}$和$\Lambda(1520)$，量化了它们的产额与可重建比例随带电粒子多重数（以$(dN_{ch}/dη)^{1/3}$表征）的变化关系。我们对比了质心系核子-核子能量$\sqrt{s_{NN}} = 19.6$ GeV与200 GeV下的结果，以探究可重建性中可能存在的能量依赖差异，这类差异反映了强子介质性质的变化。我们进一步结合共振态寿命分析结果，发现不同共振态的可重建性呈现出清晰的排序规律，总体而言可重建性主要由共振态寿命决定。定向流分析显示，在半中心碰撞中，共振态与其对应稳定强子的定向流存在明显差异，而在边缘碰撞中这类差异显著减弱，凸显了强子演化对末态定向流形成的重要作用。这些研究给出了强子阶段如何同时影响共振态可重建性与定向流的统一图景，为相对论重离子碰撞中的共振态可观测量研究提供了新见解。
英文摘要
We present a systematic study of the reconstructability and directed flow of hadronic resonances in Au+Au collisions within the UrQMD transport model. The main objective of this work is to investigate how the hadronic stage influences both resonance reconstructability and the final-state directed flow. A set of short-lived hadronic resonances, including $ρ^0$, $K^{*0}$, and $Λ(1520)$, is investigated to quantify their yields and reconstructable fractions as a function of charged-particle multiplicity, characterized by $(dN_{ch}/dη)^{1/3}$. We compare results at $\sqrt{s_{NN}} = 19.6$ and $200 ~\mathrm{GeV}$ to investigate possible energy-dependent differences in the reconstructability. Such differences reflect variations in the properties of the hadronic medium. The results are further examined as a function of resonance lifetime, revealing a clear ordering of reconstructability among different resonances. Overall, the reconstructability is found to be primarily governed by resonance lifetime. The directed-flow analysis reveals clear differences between resonances and their corresponding stable hadrons in mid-central collisions, while these differences become significantly weaker in peripheral collisions, highlighting the important role of hadronic evolution in shaping the final-state directed flow. These studies provide a unified picture of how the hadronic stage influences both resonance reconstructability and directed flow, offering new insights into resonance observables in relativistic heavy-ion collisions.
