Wednesday, June 19, 2013

1306.4201 (R. Stock et al.)

Hadronic Freeze-Out in A+A Collisions meets the Lattice QCD
Parton-Hadron Transition Line

R. Stock, F. Becattini, M. Bleicher, T. Kollegger, T. Schuster, J. Steinheimer
We analyze hadrochemical freeze-out in central Pb+Pb collisions at CERN SPS and LHC energies. Employing the UrQMD hybrid transport model we study the effects of the final hadron/resonance expansion phase on the hadron multiplicities established at hadronization. The bulk meson yields freeze out directly at hadronization whereas the baryon-antibaryon sector is subject to significant alterations, due to annihilation and regeneration processes. We quantify the latter changes by survival factors for each species which are applied to modify the statistical model predictions for the data. The modified SM analysis recovers the hadronization points, which coincide with the recent lattice QCD predictions of the parton-hadron transition line at finite baryochemical potential.
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