arXiv:1107.1574·v1·High Energy Physics — Phenomenology
Validity of the Hadronic Freeze-Out Curve
F. Becattini (1)🇮🇹 · M. Bleicher (2)🇩🇪 · T. Kollegger (2)🇩🇪 · M. Mitrovski (3)🇺🇸 · T. Schuster (2,4)🇩🇪 · R. Stock (2,4) ((1) Universitá di Firenze and INFN Sezione di Firenze, (2) Frankfurt Institute for Advanced Studies (FIAS), (3) Physics Dept., BNL, Brookhaven, (4) Institut fuer Kernphysik, University of Frankfurt)🇩🇪
Abstract
We analyze hadro-chemical freeze-out in central Pb+Pb collisions at CERN SPS energies, employing the hybrid version of UrQMD which models hadronization by the Cooper-Frye mechanism, and matches to a final hadron-resonance cascade. We fit the results both before and after the cascade stage using the Statistical Hadronization Model, to assess the effect of the cascade phase. We observe a strong effect on antibaryon yields except anti-{\Omega}, resulting in a shift in T and {\mu}_B. We discuss the implications for the freeze-out curve.
Comments: 5 pages, 8 figures. To appear in the proceedings of Quark Matter 2011, the XXII International Conference on Ultrarelativistic Nucleus-Nucleus Collisions