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Directed Flow of Identified Particles in Au + Au Collisions at sNN=200\sqrt{s{_NN}} = 200 GeV at RHIC

Collaboration
Dec, 2011
7 pages
Published in:
  • Phys.Rev.Lett. 108 (2012) 202301
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Abstract: (arXiv)
STAR's measurements of directed flow (v1v_1) around midrapidity for π±\pi^{\pm}, K±^{\pm}, KS0_S^0, pp and pˉ\bar{p} in Au + Au collisions at \sqrtsNN = 200 GeV are presented. A negative v1(y)v_1(y) slope is observed for most of produced particles (π±\pi^{\pm}, K±^{\pm}, KS0_{S}^{0} and pˉ\bar{p}). In 5-30% central collisions a sizable difference is present between the v1(y)v_1(y) slope of protons and antiprotons, with the former being consistent with zero within errors. The v1v_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 v1v_1 for both pions and protons, none of them can describe v1(y)v_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 v1(y)v_1(y) slopes of protons and antiprotons.
Note:
  • 4 figures
  • 25.75.Ld
  • heavy ion: scattering
  • gold
  • multiple production
  • hadron: particle flow
  • rapidity dependence
  • transport theory
  • quark gluon: string model
  • parton: recombination
  • quantum molecular dynamics: relativistic
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