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arXiv 1711.02496nucl-thhep-ph
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反常- Viscous Fluid动力学研究重离子碰撞中的反常手征输运

Anomalous Chiral Transport in Heavy Ion Collisions from Anomalous-Viscous Fluid Dynamics

Shuzhe Shi, Yin Jiang, Elias Lilleskov, Jinfeng Liao

摘要:

手征反常是手征费米子量子理论的一个基本方面。这种微观异常如何表现在具有手征费米子的宏观多体系统中,是一个非常重要的问题,最近引起了人们的极大兴趣。事实证明,在这样的系统中,在合适的条件下,手性异常可以引起不寻常的传输电流,其中手性磁效应(CME)的显著示例是沿着外部磁场产生矢量电流(例如电流)。通过测量CME输运引起的电荷分离效应,人们对重离子碰撞中的CME进行了大量的研究。CME信号的定量预测是CME研究中的一个关键挑战。本文在重离子碰撞的VISH 2 +1流体动力学模拟的中性体背景的基础上,发展了反常粘性流体动力学(Anomalous-Viscous Fluid Dynamics,AVFD)框架,实现了描述QGP中费米子流演化的反常流体动力学。有了这个新的工具,我们定量和系统地研究了CME信号对一系列理论输入和相关不确定性的依赖性。与现实的估计初始条件和磁场寿命,预测的CME信号与测量的变化分离数据在200 GeV的金-金碰撞定量一致。基于对Au-Au碰撞的分析,我们进一步预测了在计划的等压面(Ru-Ru v.s. Zr-Zr)碰撞实验,为重离子碰撞中的CME提供了最具决定性的检验。

英文摘要:

Chiral anomaly is a fundamental aspect of quantum theories with chiral fermions. How such microscopic anomaly manifests itself in a macroscopic many-body system with chiral fermions, is a highly nontrivial question that has recently attracted significant interest. As it turns out, unusual transport currents can be induced by chiral anomaly under suitable conditions in such systems, with the notable example of the Chiral Magnetic Effect (CME) where a vector current (e.g. electric current) is generated along an external magnetic field. A lot of efforts have been made to search for CME in heavy ion collisions, by measuring the charge separation effect induced by the CME transport. A crucial challenge in such effort, is the quantitative prediction for the CME signal. In this paper, we develop the Anomalous-Viscous Fluid Dynamics (AVFD) framework, which implements the anomalous fluid dynamics to describe the evolution of fermion currents in QGP, on top of the neutral bulk background described by the VISH2+1 hydrodynamic simulations for heavy ion collisions. With this new tool, we quantitatively and systematically investigate the dependence of the CME signal to a series of theoretical inputs and associated uncertainties. With realistic estimates of initial conditions and magnetic field lifetime, the predicted CME signal is quantitatively consistent with measured change separation data in 200GeV Au-Au collisions. Based on analysis of Au-Au collisions, we further make predictions for the CME observable to be measured in the planned isobaric (Ru-Ru v.s. Zr-Zr ) collision experiment, which could provide a most decisive test of the CME in heavy ion collisions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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