Measurement of charge multiplicity asymmetry correlations in high-energy nucleus-nucleus collisions at √s[subscript NN] = 200 GeV
Name
Adamczyk-2014-Measurement of charge multiplicity.pdf
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1.44 MB
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Author(s)
Betancourt, Michael Joseph
Corliss, Ross
Hays-Wehle, James Prewitt
Leight, William Axel
Redwine, Robert P.
Seele, J.
Steadman, Stephen G.
van Nieuwenhuizen, Gerrit Jan
Date Issued
April 2014
Journal
Physical Review C
Publisher
American Physical Society
Citation
Adamczyk, L., J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, et al. “Measurement of Charge Multiplicity Asymmetry Correlations in High-Energy Nucleus-Nucleus Collisions at √s[subscript NN] = 200 GeV.” Phys. Rev. C 89, no. 4 (April 2014). © 2014 American Physical Society
Version
Final published version
Abstract
A study is reported of the same- and opposite-sign charge-dependent azimuthal correlations with respect to the event plane in Au + Au collisions at √s[subscript NN] = 200 GeV. The charge multiplicity asymmetries between the up/down and left/right hemispheres relative to the event plane are utilized. The contributions from statistical fluctuations and detector effects were subtracted from the (co-)variance of the observed charge multiplicity asymmetries. In the mid- to most-central collisions, the same- (opposite-) sign pairs are preferentially emitted in back-to-back (aligned on the same-side) directions. The charge separation across the event plane, measured by the difference, Δ, between the like- and unlike-sign up/down-left/right correlations, is largest near the event plane. The difference is found to be proportional to the event-by-event final-state particle ellipticity (via the observed second-order harmonic v[obs over 2]), where Δ = [1.3 ± 1.4(stat)[+4.0 over −1.0](syst)] × 10[superscript −5] + [3.2 ± 0.2(stat)[+0.4 over −0.3](syst)] × 10[superscript −3]v[obs over 2] for 20–40% Au + Au collisions. The implications for the proposed chiral magnetic effect are discussed.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevC.89.044908
