Flavour and energy dependence of chemical freeze-out temperatures in relativistic heavy ion collisions from RHIC-BES to LHC energies

Abstract

We present calculations of the chemical freeze-out temperature ($T_{\mathrm{ch}}$) based on particle yields from STAR and ALICE measured at collision energies ranging from $\sqrt{s_{\mathrm{NN}}}=$ 11.5 GeV to 5.02 TeV. Employing the Grand Canonical Ensemble approach using the Thermal-FIST Hadron Resonance Gas model package, we show evidence for a flavour-dependent chemical freeze-out in the crossover region of the QCD phase diagram. At a vanishing baryochemical potential, we calculate light and strange flavour freeze-out temperatures $T_{\mathrm{L}}=150.2\pm 2.6$ MeV and $T_{\mathrm{S}}=165.1\pm 2.7$ MeV, respectively.