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Observation of an Energy-Dependent Difference in Elliptic Flow between Particles and Antiparticles in Relativistic Heavy Ion Collisions

Author(s)
Balewski, Jan T.; Betancourt, Michael Joseph; Corliss, Ross; Hays-Wehle, James Prewitt; Leight, William Axel; Stevens, Justin; van Nieuwenhuizen, Gerrit Jan; ... Show more Show less
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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.
Date issued
2013-04
URI
http://hdl.handle.net/1721.1/80805
Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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
ISSN
0031-9007
1079-7114

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