Accessing topological fluctuations of gauge fields with the chiral magnetic effect
Accessing topological fluctuations of gauge fields with the chiral magnetic effect
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DOI：
10.1103/physrevd.107.034012
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发表时间：
2021-06
影响因子：
5
通讯作者：
An-dong Huang;S. Shi;Shu Lin;Xingyu Guo;J. Liao
中科院分区：
文献类型：
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作者：
An-dong Huang;S. Shi;Shu Lin;Xingyu Guo;J. Liao
规范场提供了粒子物理标准模型中的基本相互作用。众所周知，具有非平凡拓扑绕组的规范场配置在许多重要现象中发挥着至关重要的作用，从当今宇宙的物质-反物质不对称性到强相互作用中自发的手性对称性破缺。然而，在实验中直接检测它们的存在是难以捉摸的。在这里，我们展示了重离子碰撞中手性磁效应（CME）的测量可用于获取量子色动力学（QCD）中非阿贝尔规范场的拓扑涨落。为了实现这一目标，我们将一个关键要素——规范场拓扑涨落的随机动力学——应用到了最先进的框架中，用于模拟这些碰撞中的日冕物质抛射。这个新框架提供了必要的工具来量化从实验数据中提取的任何确定的 CME 信号的初始拓扑波动。它还揭示了初始拓扑涨落与相应碰撞事件中产生的粒子多重性之间的普遍标度关系。
Gauge fields provide the fundamental interactions in the Standard Model of particle physics. Gauge field configurations with nontrivial topological windings are known to play crucial roles in many important phenomena, from matter-anti-matter asymmetry of today's universe to spontaneous chiral symmetry breaking in strong interaction. Their presence is however elusive for direct detection in experiments. Here we show that measurements of the chiral magnetic effect (CME) in heavy ion collisions can be used for accessing the topological fluctuations of the non-Abelian gauge fields in the Quantum Chromodynamics (QCD). To achieve this, we implemented a key ingredient, the stochastic dynamics of gauge field topological fluctuations, into a state-of-the-art framework for simulating the CME in these collisions. This new framework provides the necessary tool to quantify initial topological fluctuations from any definitive CME signal to be extracted from experimental data. It also reveals a universal scaling relation between initial topological fluctuations and particle multiplicity produced in the corresponding collision events.