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

0347469 - ÚJF 2011 RIV US eng J - Journal Article
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Observation of charge-dependent azimuthal correlations and possible local strong parity violation in heavy-ion collisions.
Physical Review. C. Roč. 81, č. 5 (2010), 054908/1-054908/15. ISSN 0556-2813
R&D Projects: GA ČR GA202/07/0079; GA MŠMT LA09013
Institutional research plan: CEZ:AV0Z10480505; CEZ:AV0Z10100502
Keywords : RELATIVISTIC NUCLEAR COLLISIONS * TIME PROJECTION CHAMBER * QUARK-GLUON PLASMA
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 3.416, year: 2010

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 root s(NN) = 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.
Permanent Link: http://hdl.handle.net/11104/0188241