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Balance Functions from Au++Au, d+d+Au, and p+pp+p Collisions at sNN\sqrt{s_{NN}} = 200 GeV

Collaboration
May, 2010
17 pages
Published in:
  • Phys.Rev.C 82 (2010) 024905
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Abstract: (arXiv)
Balance functions have been measured for charged particle pairs, identified charged pion pairs, and identified charged kaon pairs in Au+Au, d+Au, and p+p collisions at sNN\sqrt{s_{NN}} = 200 GeV at the Relativistic Heavy Ion Collider using the STAR detector. These balance functions are presented in terms of relative pseudorapidity, Δη\Delta \eta, relative rapidity, Δy\Delta y, relative azimuthal angle, Δϕ\Delta \phi, and invariant relative momentum, qinvq_{\rm inv}. In addition, balance functions are shown in terms of the three components of qinvq_{\rm inv}: qlongq_{\rm long}, qoutq_{\rm out}, and qsideq_{\rm side}. For charged particle pairs, the width of the balance function in terms of Δη\Delta \eta scales smoothly with the number of participating nucleons, while HIJING and UrQMD model calculations show no dependence on centrality or system size. For charged particle and charged pion pairs, the balance functions widths in terms of Δη\Delta \eta and Δy\Delta y are narrower in central Au+Au collisions than in peripheral collisions. The width for central collisions is consistent with thermal blast-wave models where the balancing charges are highly correlated in coordinate space at breakup. This strong correlation might be explained either by delayed hadronization or by limited diffusion during the reaction. Furthermore, the narrowing trend is consistent with the lower kinetic temperatures inherent to more central collisions. In contrast, the width of the balance function for charged kaon pairs in terms of Δy\Delta y shows little centrality dependence, which may signal a different production mechanism for kaons. The widths of the balance functions for charged pions and kaons in terms of qinvq_{\rm inv} narrow in central collisions compared to peripheral collisions, which may be driven by the change in the kinetic temperature.
Note:
  • 17 pages, 23 figures
  • 25.75.Gz
  • OSG : STAR
  • p p: interaction
  • heavy ion: scattering
  • deuteron
  • gold
  • charged particle: multiple production
  • charge correlation
  • correlation: two-pion
  • correlation: (2K)
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