Observation of an Energy-Dependent Difference in Elliptic Flow between Particles and Antiparticles in Relativistic Heavy Ion Collisions
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Adamczyk-2013-Observation of an Energy-Dependent Difference.pdf
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Author(s)
Balewski, Jan T.
Betancourt, Michael Joseph
Corliss, Ross
Hays-Wehle, James Prewitt
Leight, William Axel
Stevens, Justin
van Nieuwenhuizen, Gerrit Jan
Date Issued
April 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Adamczyk, L., J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, J. Alford, et al. “Observation of an Energy-Dependent Difference in Elliptic Flow between Particles and Antiparticles in Relativistic Heavy Ion Collisions.” Physical Review Letters 110, no. 14 (April 2013). © 2013 American Physical Society
Version
Final published version
Abstract
Elliptic flow (v[subscript 2]) values for identified particles at midrapidity in Au+Au collisions, measured by the STAR experiment in the beam energy scan at RHIC at √s[subscript NN]=7.7–62.4 GeV, are presented. A beam-energy-dependent difference of the values of v[subscript 2] between particles and corresponding antiparticles was observed. The difference increases with decreasing beam energy and is larger for baryons compared to mesons. This implies that, at lower energies, particles and antiparticles are not consistent with the universal number-of-constituent-quark scaling of v2 that was observed at √sNN=200 GeV.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.110.142301
