Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2009-07-13
Nucl.Phys.A830:377c-384c,2009
Physics
Nuclear Physics
Nuclear Experiment
Proceedings, plenary invited talk at Quark Matter 2009 Conference, Knoxville, Tennessee. One reference added. Final version
Scientific paper
10.1016/j.nuclphysa.2009.10.033
Parity-odd domains, corresponding to non-trivial topological solutions of the QCD vacuum, might be created in relativistic heavy ions collisions. These domains are predicted to lead to charge separation along the system orbital momentum of the system created in non-central collisions. Three-particle mixed harmonics azimuthal correlator is a \P even observable but directly sensitive to the charge separation effect. Using this observable to analyze Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}=200$ and 62 GeV, STAR detects a signal consistent with several of the theoretical expectations. Possible contributions from effects not related to parity violation are studied with existing event generators, which fail to describe the data. Future directions in studying the effect are discussed.
The STAR Collaboration
Voloshin Sergei A.
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