Fluctuations of charge separation perpendicular to the event plane and local parity violation in √SNN = 200 GeV Au+Au collisions at BNL Relativistic Heavy Ion Collider

Adamczyk, L. and Planinić, Mirko and Poljak, Nikola and Zyzak, M. (STAR Collaboration) (2013) Fluctuations of charge separation perpendicular to the event plane and local parity violation in √SNN = 200 GeV Au+Au collisions at BNL Relativistic Heavy Ion Collider. Physical Review C, 88 (6). pp. 64911-10. ISSN 0556-2813

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Abstract

Previous experimental results based on data (∼15×106 events) collected by the STAR detector at the BNL Relativistic Heavy Ion Collider suggest event-by-event charge-separation fluctuations perpendicular to the event plane in noncentral heavy-ion collisions. Here we present the correlator previously used split into its two component parts to reveal correlations parallel and perpendicular to the event plane. The results are from a high-statistics 200-GeV Au + Au collisions data set (57×106 events) collected by the STAR experiment. We explicitly count units of charge separation from which we find clear evidence for more charge-separation fluctuations perpendicular than parallel to the event plane. We also employ a modified correlator to study the possible P-even background in same- and opposite-charge correlations, and find that the P-even background may largely be explained by momentum conservation and collective motion.

Item Type: Article
Date: December 2013
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2013) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: mag. bibl. Marija Turković
Date Deposited: 15 Sep 2014 11:22
Last Modified: 17 Sep 2014 13:01
URI: http://digre.pmf.unizg.hr/id/eprint/2762

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