Azimuthal Charged-Particle Correlations and Possible Local Strong Parity Violation

By B. Abelev, M. Aggarwal, Z. Ahammed, A. Alakhverdyants, B. Anderson, D. Arkhipkin, G. S. Averichev, J. Balewski, O. Barannikova, L. Barnby and 365 more. 2009

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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 \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 $\sqrt{s_{NN}}$=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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/71feb20737e721d5b559d9da0fa3454ad8b40c92

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In Nuclear and High Energy Physics

1. N. Xu
2. V. Koch
3. J. Liao
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7. M. Stephanov
8. E. Kiritsis

Citations in the corpus

• Mapping the phases of quantum chromodynamics with beam energy scan (2019, positive): “Left panel is adapted from [157, 158] (image credit: APS/Carin Cain/B.”
• Particle Production in Strong Electromagnetic Fields in Relativistic Heavy-Ion Collisions (2013, background): “This effect is a possible explanation of experimentally observed charge asymmetry fluctuations [73–75].”