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Beam-Energy Dependence of the Directed Flow of Protons, Antiprotons, and Pions in Au+Au Collisions

Author(s)
Stevens, Justin; van Nieuwenhuizen, Gerrit J
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Abstract
Rapidity-odd directed flow (v[subscript 1]) measurements for charged pions, protons, and antiprotons near midrapidity (y = 0) are reported in √s[subscript NN] = 7.7, 11.5, 19.6, 27, 39, 62.4, and 200 GeV Au+Au collisions as recorded by the STAR detector at the Relativistic Heavy Ion Collider. At intermediate impact parameters, the proton and net-proton slope parameter dv1/dy|[subscript y=0] shows a minimum between 11.5 and 19.6 GeV. In addition, the net-proton dv1/dy|[subscript y=0] changes sign twice between 7.7 and 39 GeV. The proton and net-proton results qualitatively resemble predictions of a hydrodynamic model with a first-order phase transition from hadronic matter to deconfined matter, and differ from hadronic transport calculations.
Date issued
2014-04
URI
http://hdl.handle.net/1721.1/89208
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. “Beam-Energy Dependence of the Directed Flow of Protons, Antiprotons, and Pions in Au+Au Collisions.” Physical Review Letters 112, no. 16 (April 2014). © 2014 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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