Freeze-out parameters from electric charge and baryon number fluctuations: is there consistency?
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.
Keywords
Cite
@article{arxiv.1403.4576,
title = {Freeze-out parameters from electric charge and baryon number fluctuations: is there consistency?},
author = {S. Borsanyi and Z. Fodor and S. D. Katz and S. Krieg and C. Ratti and K. K. Szabo},
journal= {arXiv preprint arXiv:1403.4576},
year = {2014}
}
Comments
5 pages, 4 figures, references added, discussion added to the introduction, results unchanged