Chemical freeze-out in ultrarelativistic heavy ion collisions at s NN =130 and 200 GeV

A comprehensive and detailed analysis of hadronic abundances measured in Au-Au collisions at RHIC at √S NN = 130 and 200 GeV is presented. The rapidity densities measured in the central rapidity region have been fitted to the statistical hadronization model and the chemical freeze-out parameters determined as a function of centrality, using data from experiments BRAHMS, PHENIX, and STAR. The chemical freeze-out temperature turns out to be independent of centrality to accuracy of a few percentages, whereas the strangeness undersaturation parameter ys decreases from almost unity in central collisions to a significantly lower value in peripheral collisions. Our results are in essential agreement with previous analyses, with the exception that fit quality at √S NN = 200 GeV is not as good as previously found. From the comparison of the two different energies, we conclude that the difference in fit quality, as described by X 2 values, is owing to the improved resolution of measurements that has probably exceeded the intrinsic accuracy of the simplified theoretical formula used in the fits.

• Publication year

  2008

• Venue

  Physical Review C

• Publication date

  2008-06-25

• Fields of study

  Physics, Chemistry

• Identifiers
  DOI 10.1103/PhysRevC.78.054901arXiv 0806.4100
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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