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Comparison of Chemical Freeze-Out Criteria in Heavy-Ion Collisions

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arxiv hep-ph/0511094 v2 pith:23GQX7I4 submitted 2005-11-08 hep-ph nucl-thquant-ph

classification hep-phnucl-thquant-ph
keywords particleenergychemicalfreeze-outparametersyieldsheavy-ionresults
verification ladder T0 review T1 audit T2 compute T3 formal
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One of the most remarkable results to emerge from heavy-ion collisions over the past two decades is the striking regularity shown by particle yields at all energies. This has led to several very successful proposals describing particle yields over a very wide range of beam energies, reaching from 1 A GeV up to 200 A GeV, using only one or two parameters. A systematic comparison of these proposals is presented here. The conditions of fixed energy per particle, baryon+anti-baryon density, normalized entropy density as well as percolation model are investigated. The results are compared with the most recent chemical freeze-out parameters obtained in the thermal-statistical analysis of particle yields. The sensitivity and dependence of the results on parameters is analyzed and discussed. It is shown that in the energy range above the top AGS energy, within present accuracies, all chemical freeze-out criteria give a fairly good description of the particle yields. However, the low energy heavy-ion data favor the constant energy per particle as a unified condition of chemical particle freeze-out. This condition also shows the weakest sensitivity on model assumptions and parameters.

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Cited by 4 Pith papers

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    Combinations of particle yields enable parameter-free tests of thermal models and extraction of μ_B/T, μ_S/T, μ_Q/T from RHIC BES data, matching published parameters and allowing predictions for other particles and nuclei.

  4. Directed Flow of Protons and Deuterons in Xe+Cs(I) Collisions: Preliminary BM@N Data and THESEUS Modeling

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