We calculate ratios of higher-order susceptibilities quantifying fluctuations in the number of net protons and in the net-electric charge using the Hadron Resonance Gas (HRG) model. We take into account the effect of resonance decays, the kinematic acceptance cuts in rapidity, pseudo-rapidity and transverse momentum used in the experimental analysis, as well as a randomization of the isospin of nucleons in the hadronic phase. By comparing these results to the latest experimental data from the STAR collaboration, we determine the freeze-out conditions from net-electric charge and net-proton distributions and discuss their consistency.
@article{arxiv.1403.4903,
title = {Freeze-out conditions from net-proton and net-charge fluctuations at RHIC},
author = {Paolo Alba and Wanda Alberico and Rene Bellwied and Marcus Bluhm and Valentina Mantovani Sarti and Marlene Nahrgang and Claudia Ratti},
journal= {arXiv preprint arXiv:1403.4903},
year = {2015}
}