Directed Flow of Identified Particles in Au+Au Collisions at √SNN=200 GeV at RHIC
Name
Adamczyk-2012-Directed Flow of Identified Particles in Au+Au.pdf
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293.3 KB
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Author(s)
Balewski, Jan T.
Betancourt, Michael Joseph
Corliss, Ross Cameron
Hays-Wehle, James Prewitt
Leight, William Axel
Seele, Joseph Patrick
Surrow, Bernd
Redwine, Robert P
Steadman, Stephen G
van Nieuwenhuizen, Gerrit J
Date Issued
May 2012
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
L. Adamczyk et al. (STAR Collaboration), "Directed Flow of Identified Particles in Au+Au Collisions at √SNN=200 GeV at RHIC" Physical Review Letters 108, 202301 (2012). © 2012 American Physical Society
Version
Final published version
Abstract
STAR’s measurements of directed flow (v[subscript 1]) around midrapidity for π[superscript ±], K[superscript ±], K[subscript S][superscript 0], p, and p̅ in Au+Au collisions at √s[subscript NN]=200 GeV are presented. A negative v[subscript 1](y) slope is observed for most of produced particles (π[superscript ±], K[superscript ±], K[subscript S][superscript 0], and p̅ ). In 5%–30% central collisions, a sizable difference is present between the v[subscript 1](y) slope of protons and antiprotons, with the former being consistent with zero within errors. The v[subscript 1] excitation function is presented. Comparisons to model calculations (RQMD, UrQMD, AMPT, QGSM with parton recombination, and a hydrodynamics model with a tilted source) are made. For those models which have calculations of v1 for both pions and protons, none of them can describe v[subscript 1](y) for pions and protons simultaneously. The hydrodynamics model with a tilted source as currently implemented cannot explain the centrality dependence of the difference between the v[subscript 1](y) slopes of protons and antiprotons.
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/PhysRevLett.108.202301
