Speaker
Description
An advanced Hadron Resonance Gas Model (HRGM) based on the induced surface tension equation of state [1, 2] is developed which correctly accounts for weak decays. We report our results on fits of the ratios of particle yields measured in a wide range of centre-of-mass energies from a few GeV up to 2.76 TeV. In particular, our analysis of the STAR experiment data on hadronic multiplicities demonstrates that taking into account the weak decays is extremely important to have a model that can describe the data with high accuracy and in a physically correct way. Moreover, the inclusion of weak decays in the analysis of BES data leads to a decrease in the chemical freeze-out (CFO) temperature of hadrons by about $10-15$ MeV. For the first time, the results for the CFO parameters obtained by the fits to the BES program data in the collision energy range $\sqrt{s_{NN}}=7.7-200$ GeV are in complete agreement with the ones obtained earlier in different models for the ALICE energy $\sqrt{s_{NN}}=2.76$ TeV [2,3] as well as with the Lattice QCD results for the pseudocritical line [4]. Remarkably, it is shown that the CFO parameters of light (anti-, hyper-) nuclei obtained in [5] are not affected by these modifications. They are in agreement with the PHQMD simulations [6] and provide a solution to the so-called “snowballs in hell” problem.
References:
[1] K. A. Bugaev et al., Nucl. Phys. A 970 (2018) 133.
[2] K. A. Bugaev et al., Eur. Phys. J. A 56 (2020) 293.
[3] A. Andronic et al., Nature 561 (2018) 321 and references therein
[4] B. Szabolcs et al., Phys. Rev. Lett. 125 (2020) 052001
[5] O. Vitiuk et al., Eur. Phys. J. A 57 (2021) 74.
[6] S. Gläßel et al., arXiv:2106.14839
