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

Author(s)
Balewski, Jan T.; Betancourt, Michael Joseph; Corliss, Ross; Hays-Wehle, James Prewitt; Leight, William Axel; Stevens, Justin; van Nieuwenhuizen, Gerrit Jan; Walker, M.; ... Show more Show less
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Abstract
Previous experimental results based on data (∼15 × 10[superscript 6] 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 × 10[superscript 6] 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.
Date issued
2013-12
URI
http://hdl.handle.net/1721.1/87747
Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review C
Publisher
American Physical Society
Citation
Adamczyk, L., J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, J. Alford, et al. “Fluctuations of charge separation perpendicular to the event plane and local parity violation in √S[subscript NN] = 200 GeV Au + Au collisions at the BNL Relativistic Heavy Ion Collider.” Phys. Rev. C 88, no. 6 (December 2013). © 2013 American Physical Society
Version: Final published version
ISSN
0556-2813
1089-490X

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