论文标题
等离子碰撞中的伊索巴尔运行结果对手性磁效应的含义
Implications of the isobar run results for chiral magnetic effect in heavy ion collisions
论文作者
论文摘要
手性磁效应（CME）是在手性不平衡和外部磁场的情况下由量子异常诱导的宏观转运现象。相对论的重离子碰撞为在非亚洲血浆中寻找CME提供了独特的机会，在非阿您等离子体中，手性失衡是由与早期宇宙中发生的拓扑过渡产生的。提出了相对论重离子对撞机的iSOBAR运行，是一种将磁场驱动的可能的CME信号与背景分开的方式。这项重要实验的第一个盲目分析结果最近由Star Collaboration发布。在RURU和ZRZR中相同背景的预定义假设下，结果与CME的存在以及所有现有的理论模型（无论是否包括CME）不一致。但是，在得出任何物理结论之前，必须考虑观察到的背景差异。在本文中，我们表明，一旦在数量上考虑了强子多样性和集体流的观察到的差异，则恒星结果可能与有限的CME信号贡献约为$（6.8 \ pm2.6）\％$一致。
Chiral magnetic effect (CME) is a macroscopic transport phenomenon induced by quantum anomaly in the presence of chiral imbalance and an external magnetic field. Relativistic heavy ion collisions provide the unique opportunity to look for CME in a non-Abelian plasma, where the chiral imbalance is created by topological transitions similar to those occurring in the Early Universe. The isobar run at Relativistic Heavy Ion Collider was proposed as a way to separate the possible CME signal driven by magnetic field from the background. The first blind analysis results from this important experiment have been recently released by the STAR Collaboration. Under the pre-defined assumption of identical background in RuRu and ZrZr, the results are inconsistent with the presence of CME, as well as with all existing theoretical models (whether including CME or not). However the observed difference of backgrounds must be taken into account before any physical conclusion is drawn. In this paper, we show that once the observed difference in hadron multiplicity and collective flow are quantitatively taken into account, the STAR results could be consistent with a finite CME signal contribution of about $(6.8\pm2.6)\%$.
