论文标题
解读$ r_ {ψ_{m}} $相关器，以搜索相对论重离子碰撞中的手性磁效应
Decipher the $R_{Ψ_{m}}$ correlator in search for the chiral magnetic effect in relativistic heavy ion collisions
论文作者
论文摘要
背景：在RHIC和LHC的重离子碰撞中，对手性磁效应（CME）进行了广泛的研究。提出了一个称为$ r_ {ψ_{m}} $的方位角相关器来测量CME。通过观察相同的$ r_ {ψ_{2}} $和$ r_ {ψ_{3}}} $（convex）分布来自多相传输（AMPT）模型，通过对比数据和模型以及大型和小型系统以及近期的preprint（eSe），一个preprint（arxiv：arxiv：2006.06.6251v：ag eSe Esemant） $ r_ {ψ_{m}} $可观察到对CME信号敏感，并且对背景相对不敏感，其AU+AU数据与已知的背景贡献不一致。 目的：我们通过研究$ r_ {ψ_{m}} $使用AMPT以及玩具模型模拟的$ r_ {ψ_{m}} $的鲁棒性来检查这些主张。我们将$ r_ {ψ_{m}} $与更广泛使用的$δγ$ Azimuthal相关器进行比较，以识别其共同点和差异。 方法：我们使用AMPT模拟AU+AU，P+AU和D+AU碰撞，以$ \ sqrt {s_ {s_ {nn}} = 200 \ text {gev} $，并研究$ r_ {ψ_{ψ_{m}} $的响应。我们还使用玩具模型来模拟共振流背景和输入CME信号，以调查其效果$ r_ {ψ_{2}} $。此外，我们使用玩具模型执行ESE分析，以与星数据进行比较，并预测$ r_ {ψ_{2}} $的灵敏度与ISOBAR碰撞的敏感性，并与RhiC进行的事件统计数据相比。 ...
Background: The chiral magnetic effect (CME) is extensively studied in heavy-ion collisions at RHIC and the LHC. An azimuthal correlator called $R_{Ψ_{m}}$ was proposed to measure the CME. By observing the same $R_{Ψ_{2}}$ and $R_{Ψ_{3}}$ (convex) distributions from A Multi-Phase Transport (AMPT) model, by contrasting data and model as well as large and small systems and by event shape engineering (ESE), a recent preprint (arXiv:2006.04251v1) from STAR suggests that the $R_{Ψ_{m}}$ observable is sensitive to the CME signal and relatively insensitive to backgrounds, and their Au+Au data are inconsistent with known background contributions. Purpose: We examine those claims by studying the robustness of the $R_{Ψ_{m}}$ observable using AMPT as well as toy model simulations. We compare $R_{Ψ_{m}}$ to the more widely used $Δγ$ azimuthal correlator to identify their commonalities and differences. Methods: We use AMPT to simulate Au+Au, p+Au, and d+Au collisions at $\sqrt{s_{NN}} = 200 \text{ GeV}$, and study the responses of $R_{Ψ_{m}}$ to anisotropic flow backgrounds in the model. We also use a toy model to simulate resonance flow background and input CME signal to investigate their effects in $R_{Ψ_{2}}$. Additionally we use the toy model to perform an ESE analysis to compare to STAR data as well as predict the degree of sensitivity of $R_{Ψ_{2}}$ to isobar collisions with the event statistics taken at RHIC. ...
