Net-proton probability distribution in heavy ion collisions

P. Braun-Munzinger, B. Friman, F. Karsch, K. Redlich, and V. Skokov
Phys. Rev. C 84, 064911 – Published 15 December 2011

Abstract

We compute net-proton probability distributions in heavy ion collisions within the hadron resonance gas model. The model results are compared with data taken by the STAR Collaboration in Au-Au collisions at sNN=200 GeV for different centralities and for the central energy bin at sNN=39 GeV. We show that, in central Au-Au collisions at sNN=39 GeV, the measured distribution is consistent with the hadron resonance gas model but differs from the predictions of the model at sNN=200 GeV. At the highest energy, deviations from model results are smaller for peripheral collisions. We argue that such properties of probability distributions are expected if the freeze-out conditions probed by fluctuations are located close to the QCD crossover transition.

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  • Received 22 July 2011

DOI:https://doi.org/10.1103/PhysRevC.84.064911

©2011 American Physical Society

Authors & Affiliations

P. Braun-Munzinger1,2,3,4, B. Friman2, F. Karsch5,6, K. Redlich1,7, and V. Skokov2,4,5

  • 1ExtreMe Matter Institute EMMI, GSI, D-64291 Darmstadt, Germany
  • 2GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
  • 3Technical University, D-64289 Darmstadt, Germany
  • 4Frankfurt Institute for Advanced Studies, J.W. Goethe University, Frankfurt, Germany
  • 5Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 6Fakultät für Physik, Universität Bielefeld, D-33501 Bielefeld, Germany
  • 7Institute of Theoretical Physics, University of Wroclaw, PL–50204 Wrocław, Poland

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Issue

Vol. 84, Iss. 6 — December 2011

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