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相对论性重离子碰撞中的电荷分离效应

On the Charge Separation Effect in Relativistic Heavy Ion Collisions

Jinfeng Liao, Volker Koch, Adam Bzdak

备注：
26 pages, 7 figures
发表信息：
Phys.Rev.C82:054902,2010
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摘要：

在本文中，我们讨论了测量相对论性重离子碰撞中可能存在的局域宇称破缺的替代方法。我们专注于电荷分离的现象，并介绍了带电偶极子矢量$\hat{Q}^c_1$，这将测量一个事件的基础上的电荷分离。使用Monte Carlo事件，我们证明了该方法及其鉴别能力。特别是，我们表明，这样的分析将揭示电荷分离效应的强度及其与反应平面的方位角相关性。我们进一步表明，我们提出的方法可能能够区分实际的电荷分离效果和效果，由于某些两个粒子的相关性。连接到目前的测量粒子相关性的基础上进行了讨论。

英文摘要：

In this paper, we discuss alternative means of measuring the possible presence of local parity violation in relativistic heavy ion collisions. We focus on the phenomenon of charge separation and introduce the charged dipole vector $\hat{Q}^c_1$, which will measure the charge separation on an event-by-event basis. Using Monte Carlo events, we demonstrate the method and its discriminating power. In particular we show that such an analysis will reveal the strength of charge separation effect and its azimuthal correlation with the reaction plane. We further show that our proposed method may be able to distinguish between the actual charge separation effect and effects due to certain two particle correlations. The connection to present measurements based on particle correlations is discussed.

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