Chemical freeze-out in ultrarelativistic heavy ion collisions at {radical}(s{sub NN})=130 and 200 GeV

A comprehensive and detailed analysis of hadronic abundances measured in Au-Au collisions at RHIC at {radical}(s{sub 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 p...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 2008-11, Vol.78 (5)
Main Authors: Manninen, J., Becattini, F., Universita di Firenze and INFN Sezione di Firenze, Florence
Format: Article
Language:English
Subjects:
ATOM-ATOM COLLISIONS
BROOKHAVEN RHIC
COLLISIONS
COMPARATIVE EVALUATIONS
DENSITY
EXCEPTIONS
FREEZING OUT
GEV RANGE 100-1000
GOLD
HADRONS
HEAVY ION REACTIONS
NUCLEAR PHYSICS AND RADIATION PHYSICS
PARTICLE RAPIDITY
PERIPHERAL COLLISIONS
RELATIVISTIC RANGE
RESOLUTION
STARS
STRANGENESS
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Summary:A comprehensive and detailed analysis of hadronic abundances measured in Au-Au collisions at RHIC at {radical}(s{sub 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 {gamma}{sub S} 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 {radical}(s{sub 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 {chi}{sup 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.
ISSN:0556-2813
1089-490X
DOI:10.1103/PHYSREVC.78.054901