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Scaling properties at freeze-out in relativistic heavy ion collisions

Abstract : Identified charged pion, kaon, and proton spectra are used to explore the system size dependence of bulk freeze-out properties in Cu+Cu collisions at $\sqrt{s_{NN}}$=200 and 62.4 GeV. The data are studied with hydrodynamically-motivated Blast-wave and statistical model frameworks in order to characterize the freeze-out properties of the system. The dependence of freeze-out parameters on beam energy and collision centrality is discussed. Using the existing results from Au+Au and $pp$ collisions, the dependence of freeze-out parameters on the system size is also explored. This multi-dimensional systematic study furthers our understanding of the QCD phase diagram revealing the importance of the initial geometrical overlap of the colliding ions. The analysis of Cu+Cu collisions, which expands the system size dependence studies from Au+Au data with detailed measurements in the smaller system, shows that the bulk freeze-out properties of charged particles studied here scale with the total charged particle multiplicity at mid-rapidity, suggesting the relevance of initial state effects.
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Contributor : Sylvie Flores <>
Submitted on : Monday, June 24, 2013 - 7:50:00 AM
Last modification on : Monday, June 15, 2020 - 3:00:02 PM

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M. M. Aggarwal, W. Borowski, Magali Estienne, A. Geromitsos, S. Kabana. Scaling properties at freeze-out in relativistic heavy ion collisions. Physical Review C, American Physical Society, 2010, 83, pp.034910. ⟨10.1103/PhysRevC.83.034910⟩. ⟨in2p3-00837652⟩



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