Observation of charge-dependent azimuthal correlations and possible local strong parity violation in heavy-ion collisions

Abelev, B. I. and Planinić, Mirko and Poljak, Nikola and Zuo, J. X. (STAR Collaboration) (2010) Observation of charge-dependent azimuthal correlations and possible local strong parity violation in heavy-ion collisions. Physical Review C, 81 (5). pp. 54908-15. ISSN 0556-2813

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Abstract

Parity (P)-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 orbital momentum of the system created in noncentral collisions. To study this effect, we investigate a three-particle mixed-harmonics azimuthal correlator which is a P-even observable, but directly sensitive to the charge-separation effect. We report measurements of this observable using the STAR detector in Au+Au and Cu+Cu collisions at √sNN=200 and 62 GeV. The results are presented as a function of collision centrality, particle separation in rapidity, and particle transverse momentum. A signal consistent with several of the theoretical expectations is detected in all four data sets. We compare our results to the predictions of existing event generators and discuss in detail possible contributions from other effects that are not related to P violation.

Item Type: Article
Keywords: parity, violation heavy ion, scattering gold copper quantum chromodynamics, vacuum state correlation function, (3particle) charged particle, angular correlation topological Monte Carlo STAR Brookhaven RHIC Coll impact parameter, dependence rapidity dependence transverse momentum, dependence 62, 200 GeV-cms/nucleon
Date: May 2010
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2010) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 10 Jun 2014 08:48
Last Modified: 24 Feb 2016 15:33
URI: http://digre.pmf.unizg.hr/id/eprint/2310

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