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arXiv · 1403.4576

Freeze-out parameters from electric charge and baryon number fluctuations: is there consistency?

S. Borsanyi·Z. Fodor·S. D. Katz·S. Krieg·C. Ratti·K. K. Szabo
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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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S. Borsanyi, Z. Fodor, S. D. Katz, S. Krieg, C. Ratti, K. K. Szabo. 2014-03-25. Freeze-out parameters from electric charge and baryon number fluctuations: is there consistency?. https://doi.org/10.1103/physrevlett.113.052301

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