使用输运模型在中心快度区识别强子的偶极流
Dipolar flow of identified hadrons at mid-rapidity using transport models
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中文总结 AI 辅助
利用AMPT模型研究Au+Au碰撞中识别强子（π、K、p）的偶极流v1^even，发现质子-反质子v1^even随束流能量降低出现分裂，而介子无此现象，表明该分裂敏感于重子输运和早期部分子动力学。
中文摘要 AI 辅助
我们报告了在$\sqrt{s_{NN}} = 27-200$ GeV的Au+Au碰撞中，使用输运模型对中心快度区识别带电强子的偶极流快度偶分量$v_{1}^{\mathrm{even}}$的研究。分析采用AMPT模型，并与HIJING比较以量化非流贡献。在$\sqrt{s_{NN}} = 200$ GeV时，识别强子（$\pi$、$K$和$p$）的$v_{1}^{\mathrm{even}}$在粒子和反粒子之间没有显著差异。然而，随着束流能量降低，质子和反质子的$v_{1}^{\mathrm{even}}$出现明显的分裂，而介子（$\pi^{\pm}$和$K^{\pm}$）没有观察到相应的差异。比较AMPT弦融化和默认配置表明，分裂仅出现在弦融化场景中，其中部分子相互作用和夸克凝聚起主导作用。这些结果表明，质子-反质子$v_{1}^{\mathrm{even}}$的差异对重子输运和早期部分子动力学敏感。我们的研究强调了在RHIC束流能量扫描能量下识别粒子$v_{1}^{\mathrm{even}}$测量作为重子停止和部分子介质演化新探针的潜力。
英文摘要
We report a transport model study of the rapidity even component of dipolar flow, $v_{1}^{\mathrm{even}}$, for identified charged hadrons at mid-rapidity in Au+Au collisions at $\sqrt{s_{NN}} = 7.7-200$ GeV. The analysis is performed using the AMPT model. In addition, HIJING model is used to quantify residual non-flow contributions in $v_{1}^{\mathrm{even}}$. The $v_{1}^{\mathrm{even}}$ of identified hadrons ($π$, $K$, and $p$) shows no significant difference between particles and anti-particles at $\sqrt{s_{NN}} = 200$ GeV. However, a clear splitting between proton and anti-proton $v_{1}^{\mathrm{even}}$ develops with decreasing beam energy, while no corresponding difference is observed for mesons ($π^{\pm}$ and $K^{\pm}$). These results indicate that the proton-antiproton difference in $v_{1}^{\mathrm{even}}$ is sensitive to baryon transport and antibaryon annihilation in the hadronic medium. Our study highlights the potential of identified-particle $v_{1}^{\mathrm{even}}$ measurements at RHIC Beam Energy Scan energies as a novel probe of baryon stopping and the evolution of the hadronic medium.
发表机构
- Indian Institute of Science Education and Research, Berhampur（印度科学教育研究所）
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