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

L. Adamczyk et al. (STAR Collaboration)
Phys. Rev. C 88, 064911 – Published 26 December 2013

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.

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  • Received 12 August 2013

DOI:https://doi.org/10.1103/PhysRevC.88.064911

©2013 American Physical Society

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Vol. 88, Iss. 6 — December 2013

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