Abstract

Anisotropic flow is sensitive to the properties of the systems created in heavy-ion collisions. Azimuthally-sensitive femtoscopy with respect to the first-order event plane is coupled with the directed flow, and probes the space-time structure of the particle-emitting source. The knowledge of the source tilt can give a helpful experimental handle on the origin of the anisotropic flow. In addition, the tilt angle dependence on different collision systems at the same energy can provide constraints on theoretical models. In the experiment, this information can be extracted by measuring pion femtoscopic radii as a function of the pair emission angle with respect to the first-order event plane. In this work, we present comparisons between the results of the radius oscillations of the pion-emitting sources at \(\sqrt {{{s}_{{NN}}}} \) = 200 GeV in symmetric (Au + Au) and asymmetric (Cu + Au) collisions measured with the STAR experiment, and those estimated in the UrQMD model.

中文翻译：

---

STAR实验中$$ \ sqrt {{{s} _ {{{NN}}}} $$ = 200 GeV的Cu + Au和Au + Au碰撞中方位角微分离子电镜

摘要

各向异性流对重离子碰撞中产生的系统的属性敏感。相对于一阶事件平面的方位角敏感的飞镜与定向流耦合，并探测了粒子发射源的时空结构。源倾斜的知识可以为各向异性流的起源提供有用的实验方法。另外，在相同能量下对不同碰撞系统的倾斜角依赖性可以对理论模型提供约束。在实验中，可以通过测量相对于一阶事件平面的成对发射角的函数来测量介子费米镜半径来提取此信息。在这项工作中，我们将比较pion发射源的半径振荡​​结果在\（\ sqrt {{{s} _ {{NN}}}} \） = STAR实验测得的对称（Au + Au）和非对称（Cu + Au）碰撞中的200 GeV，以及在UrQMD模型中估计的碰撞中的200 GeV 。