RHIC上$p_{\mathrm{T}}$微分径向流涨落$v_{0}(p_{\mathrm{T}})$的碰撞能量和系统尺寸依赖性
Collision energy and system size dependence of $p_{\mathrm{T}}$-differential radial flow fluctuations $v_{0}(p_{\mathrm{T}})$ at RHIC
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- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), and Institute of Modern Physics, Fudan University（核物理与离子束应用（教育部）重点实验室，复旦大学现代物理研究所）
- Department of Chemistry, Stony Brook University（石溪大学化学系）
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中文总结 AI 辅助
本文首次在RHIC的Au+Au和O+O碰撞中测量$v_0(p_\mathrm{T})$，发现其归一化响应具有普适性，对体粘滞系数敏感，可作为径向流响应和QGP输运性质的探针。
中文摘要 AI 辅助
我们报告了在$\sqrt{s_\mathrm{NN}}=7.7$--$200$ GeV的Au+Au碰撞和$\sqrt{s_\mathrm{NN}}=200$ GeV的O+O碰撞中$v_0(p_\mathrm{T})$的首次RHIC测量。积分涨落$v_0$在大系统和小系统中遵循共同的$N_{\rm ch}$依赖性，表明涨落幅度主要由初始横向尺寸的事件逐事件涨落控制。归一化响应$v_0(p_\mathrm{T})/v_0$在不同中心度和系统中因子化，揭示了一个普遍的水动力学响应$\kappa_0(p_\mathrm{T})/\kappa_0$，该响应在很大程度上独立于涨落幅度。已识别强子的质量排序和粘性模型比较展示了对体粘滞系数（$\zeta/s$）的敏感性。这些结果确立了$v_0(p_\mathrm{T})$作为径向水动力学响应、大和小碰撞系统中的集体性以及QGP输运性质探针的地位。
英文摘要
We report the first RHIC measurements of $v_{0}(p_\mathrm{T})$ in Au+Au collisions at $\sqrt{s_\mathrm{NN}}=7.7$--$200$ GeV and O+O collisions at $\sqrt{s_\mathrm{NN}}=200$ GeV. The integral fluctuation $v_0$ follows a common $N_{\rm ch}$ dependence in large and small systems, suggesting that the fluctuation magnitude is predominantly controlled by event-by-event fluctuations of the initial transverse size. The normalized response $v_0(p_\mathrm{T})/v_0$ factorizes across centralities and systems, revealing a universal hydrodynamic response $κ_0(p_\mathrm{T})/κ_0$ largely independent of the fluctuation amplitude. Identified-hadron mass ordering and viscous model comparisons demonstrate sensitivity to bulk viscosity ($ζ/s$). These results establish $v_0(p_\mathrm{T})$ as a probe of the radial hydrodynamic response, collectivity across large and small collision systems, and QGP transport properties.
