有限覆盖对整体自旋排列方位角依赖性影响的实际考虑
Practical considerations for the effect of finite coverage on the azimuthal dependence of global spin alignment
摘要：
矢量介子的整体自旋排列是研究非中心相对论性重离子碰撞中产生的系统涡度场的有力探针。由于整体自旋排列的实验观测值对许多因素敏感，在测量矢量介子的整体自旋排列时需要进行适当的修正。本文提出了一种在提取自旋取向参数$ρ_{00}$的方位依赖关系时，修正有限赝快度覆盖影响的方法。考虑了有限赝快度覆盖对$ϕ$介子自旋取向方位角依赖性的影响以及可能存在的本征自旋取向效应。通过蒙特卡罗模拟验证了本文方法的正确性，该方法能正确、准确地测量自旋整体排列的方位角关系。
英文摘要：
The global spin alignment of vector mesons is a powerful probe to study the vorticity field of the system produced in non-central relativistic heavy-ion collisions. Since the experimental observables of global spin alignment are sensitive to many factors, proper corrections are need to be taken care of when measuring the global spin alignment of vector mesons. In this paper, we propose a method to correct the effect of finite pseudo-rapidity coverage when extract the azimuthal dependence of spin alignment parameter $ρ_{00}$. The effects of the finite pseudo-rapidity coverage on the azimuthal dependence of $ϕ$ meson spin alignment and the potentially exist intrinsic spin alignment effects are taken into consideration. The method presented in this paper is verified in a Monte-Carlo simulation, it allows the measurements of azimuthal dependence of global spin alignment to be conducted properly and accurately.
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