用多相输运模型计算归一化关联函数手征磁效应的背景值
Background evaluations for the chiral magnetic effect with normalized correlators using a multiphase transport model
摘要：
在重离子碰撞中，旁观质子产生的磁场是手征磁效应（CME）的主要来源。然而，基于电荷相关角关联（$γ$）的CME实验搜索仍然没有定论，因为非CME背景贡献还没有得到很好的理解。实验上，$γ$关联函数相对于二阶（$Ψ_{2}$）和三阶（$Ψ_{3}$）对称平面进行了测量，分别定义为$γ_{112}$和$γ_{123}$。预期通过适当的归一化，$γ_{123}$将为$γ_{112}$中的背景贡献提供数据驱动的估计。在这项工作中，我们计算不同的谐波的$γ$关联函数使用电荷守恒版本的多相传输（AMPT）模型来检查所述假设的有效性。我们发现，纯背景的AMPT模拟不产生一个平等的归一化$γ_{112}$和$γ_{123}$，量化的$κ_{112}$和$κ_{123}$，分别。此外，我们测试了AMPT中的另一个相关器$γ_{132}$，并讨论了不同$γ$关联函数之间的关系。
英文摘要：
The chiral magnetic effect (CME) induces an electric charge separation in a chiral medium along the magnetic field that is mostly produced by spectator protons in heavy-ion collisions. The experimental searches for the CME, based on the charge-dependent angular correlations ($γ$), however, have remained inconclusive, because the non-CME background contributions are not well understood. Experimentally, the $γ$ correlators have been measured with respect to the second-order ($Ψ_{2}$) and the third-order ($Ψ_{3}$) symmetry planes, defined as $γ_{112}$ and $γ_{123}$, respectively. The expectation was that with a proper normalization, $γ_{123}$ would provide a data-driven estimate for the background contributions in $γ_{112}$. In this work, we calculate different harmonics of the $γ$ correlators using a charge-conserving version of a multiphase transport (AMPT) model to examine the validity of the said assumption. We find that the pure-background AMPT simulations do not yield an equality in the normalized $γ_{112}$ and $γ_{123}$, quantified by $κ_{112}$ and $κ_{123}$, respectively. Furthermore, we test another correlator, $γ_{132}$, within AMPT, and discuss the relation between different $γ$ correlators.
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