AI 中文总结
研究相对论重离子碰撞中快度偶数偶极流，用AMPT和HIJING模型，通过依赖赝快度的加权程序抑制全局动量守恒贡献，重现其横动量依赖性，显示对部分子散射强度的敏感性，为约束碰撞相关特性提供框架。
AI 中文摘要
快度偶数定向流（$v_{1}^{even}$）是相对论重离子碰撞初始状态下波动驱动偶极不对称性的灵敏探针。其提取因大的一阶非流关联而复杂，尤其是全局动量守恒（GMC）引起的那些。本文用AMPT和HIJING模型研究了$\sqrt{s_{NN}} = 200$ GeV的Au+Au碰撞中的$v_{1}^{even}$及其多粒子关联。采用依赖于赝快度的加权程序抑制主要的GMC贡献。HIJING用作非集体基线，AMPT用于研究对末态部分子输运的敏感性。GMC校正后的HIJING结果对大多数与$v_1$相关的可观测量大幅降低，表明类似HIJING的主要反冲贡献得到有效缓解。AMPT计算重现了$v_{1}^{even}$特征性的符号变化的横动量依赖性，并显示出对部分子散射强度的敏感性。涉及$v_1$、$v_2$和$v_3$的混合谐波和归一化关联表明偶极模式与椭圆几何和波动驱动的三角形结构相关。这些结果表明，GMC抑制的快度偶数偶极流关联为约束重离子碰撞中的初始态波动和末态输运提供了一个有前景 的框架。
英文摘要
Rapidity-even directed flow, ($v_{1}^{even}$), provides a sensitive probe of fluctuation-driven dipolar asymmetry in the initial state of relativistic heavy-ion collisions. Its extraction is complicated by large first-harmonic non-flow correlations, particularly those induced by global momentum conservation (GMC). In this work, we study ($v_{1}^{even}$) and its multi-particle correlations in Au+Au collisions at ($\sqrt{s_{NN}}=200$) GeV using the AMPT and HIJING models. An ($η$)-dependent weighting procedure is employed to suppress the leading GMC contribution. HIJING is used as a non-collective baseline, while AMPT is used to investigate sensitivity to final-state partonic transport. The GMC-corrected HIJING results are strongly reduced for most ($v_1$)-related observables, indicating that the leading HIJING-like recoil contribution is effectively mitigated. The AMPT calculations reproduce the characteristic sign-changing ($p_T$) dependence of ($v_{1}^{even}$) and show sensitivity to the partonic scattering strength. Mixed-harmonic and normalized correlations involving ($v_1$), ($v_2$), and ($v_3$) suggest that the dipolar mode is correlated with both the elliptic geometry and fluctuation-driven triangular structure. These results demonstrate that GMC-suppressed rapidity-even dipolar-flow correlations provide a promising framework for constraining initial-state fluctuations and final-state transport in heavy-ion collisions.
Comments14 pages, 12 figures
