Freeze-Out Parameters from Electric Charge and Baryon Number Fluctuations: Is There Consistency?

Borsányi, Szabolcs and Fodor, Zoltán and Katz, Sándor and Krieg, S. and Ratti, C. and Szabo, K. K. (2014) Freeze-Out Parameters from Electric Charge and Baryon Number Fluctuations: Is There Consistency? PHYSICAL REVIEW LETTERS, 113 (5). ISSN 0031-9007

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Abstract

Recent results for moments of multiplicity distributions of net-protons and net-electric charge from the STAR collaboration are compared to lattice QCD results for higher order fluctuations of baryon number and electric charge by the Wuppertal-Budapest collaboration, with the purpose of extracting the freeze-out temperature and chemical potential. All lattice simulations are performed for a system of 2+1 dynamical quark flavors, at the physical mass for light and strange quarks; all results are continuum extrapolated. We show that it is possible to extract an upper value for the freeze-out temperature, as well as precise baryo-chemical potential values corresponding to the four highest collision energies of the experimental beam energy scan. Consistency between the freeze-out parameters obtained from baryon number and electric charge fluctuations is found. The freeze-out chemical potentials are now in agreement with the statistical hadronization model.

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