arXiv 0907.04942009-07hep-lathep-ph

格点规范理论中手征磁效应的数值证据

Numerical evidence of chiral magnetic effect in lattice gauge theory

P. V. Buividovich, M. N. Chernodub, E. V. Luschevskaya, M. I. Polikarpov

备注：: 14 pages, 14 figures, uses RevTeX 4.0; revision: references and comments added, figures corrected, published version
发表信息：: Phys.Rev.D80:054503,2009
DOI：: 10.1103/PhysRevD.80.054503

摘要：

手征磁效应是指在拓扑非平凡胶子场的背景下，夸克沿外磁场产生的电流。最近的证据表明，STAR合作组在RHIC的重离子碰撞中观察到了这种效应。在本文中，我们研究定性签名的手征磁效应，淬火晶格模拟。我们发现，无论是在量子胶子场的平衡配置，并在一个光滑的胶子背景与非零拓扑电荷的电流确实是增强的方向上的磁场的迹象。在限制阶段，磁场增强了电荷和手征电荷密度的局部波动。在解除禁闭阶段，磁场的影响变得更小，可能是由于热屏蔽。使用一个简单的火球模型，我们得到了很好的协议，我们的数据和STAR合作的实验结果。

英文摘要：

The chiral magnetic effect is the generation of electric current of quarks along external magnetic field in the background of topologically nontrivial gluon fields. There is a recent evidence that this effect is observed by the STAR Collaboration in heavy ion collisions at RHIC. In our paper we study qualitative signatures of the chiral magnetic effect using quenched lattice simulations. We find indications that the electric current is indeed enhanced in the direction of the magnetic field both in equilibrium configurations of the quantum gluon fields and in a smooth gluon background with nonzero topological charge. In the confinement phase the magnetic field enhances the local fluctuations of both the electric charge and chiral charge densities. In the deconfinement phase the effects of the magnetic field become smaller, possibly due to thermal screening. Using a simple model of a fireball we obtain a good agreement between our data and experimental results of the STAR Collaboration.

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摘要：

英文摘要：

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