方位角带电粒子关联和可能的局域强宇称破坏
Azimuthal Charged-Particle Correlations and Possible Local Strong Parity Violation
摘要：
在相对论性重离子碰撞过程中，可能产生奇宇称域，对应于QCD真空的非平凡拓扑解。这些领域的预测，导致电荷分离的夸克沿系统的轨道动量轴。我们研究了一个三粒子方位角相关器，它是一个甚至可观察的，但直接敏感的电荷分离效应。我们报告的测量带电强子附近的质量中心的速度，这可观察到在金+金和铜+铜碰撞在$\sqrt{s_{NN}}$ =200 GeV使用STAR探测器。检测到与来自理论的几个期望一致的信号。我们讨论了可能的贡献，不相关的奇偶违反的其他影响。
英文摘要：
Parity-odd domains, corresponding to non-trivial topological solutions of the QCD vacuum, might be created during relativistic heavy ion collisions. These domains are predicted to lead to charge separation of quarks along the system's orbital momentum axis. We investigate a three particle azimuthal correlator which is a ¶even observable, but directly sensitive to the charge separation effect. We report measurements of charged hadrons near center-of-mass rapidity with this observable in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$=200 GeV using the STAR detector. A signal consistent with several expectations from the theory is detected. We discuss possible contributions from other effects that are not related to parity violation.
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