Azimuthal Charged-Particle Correlations and Possible Local Strong Parity Violation
Azimuthal Charged-Particle Correlations and Possible Local Strong Parity Violation
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DOI：
10.1103/physrevlett.103.251601
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发表时间：
2009-12-18
影响因子：
8.6
通讯作者：
Zuo, J. X.
中科院分区：
文献类型：
--
作者：
Abelev, B. I.;Aggarwal, M. M.;Zuo, J. X.
Parity-odd domains, corresponding to nontrivial 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 P 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 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.
