Abstract
In this contributions we discuss the novel version of hadron resonance gas model which is based on the induced surface tension concept. Also we present new arguments in favor of a hypothesis that the chiral symmetry restoration transition in central nuclear collisions may occur at the center of mass energies 4.3-4.9 GeV and that the deconfinement phase transition may occur at the center of mass energies 8.8-9.2 GeV. These arguments are based on the unique thermostatic properties of the mixed phase and the ones of an exponential mass spectrum of hadrons.
Highlights
During more than thirty years of searches for the deconfinement and for the chiral symmetry restoration (CSR) phase transitions (PT) in heavy ion collisions (HIC) there were made many interesting discoveries [1], but until recently the situation with the reliable signals was rather controversial. Such peculiar irregularities in excitation functions of experimental data, known in the literature as the Kink [2], the Strangeness Horn [3] and the Step [4], motivated the experimental program at CERN SPS to lower the collision energy in order to locate the onset of deconfinement, an absence of firm theoretical explanation of these irregularities was always the source of natural doubts about their relation to deconfinement PT
The major argument of Ref. [6] that the Kink, Strangeness Horn and Step observed in HIC are the signals of deconfinement is based on the fact that the corresponding quantities observed in proton-proton collisions behave entirely different
It is necessary to stress that such a situation is not surprising, since in HIC we are dealing with finite systems for which there is no rigorous theory of first order PT of the liquid-gas type
Summary
During more than thirty years of searches for the deconfinement and for the chiral symmetry restoration (CSR) phase transitions (PT) in heavy ion collisions (HIC) there were made many interesting discoveries [1], but until recently the situation with the reliable signals was rather controversial Such peculiar irregularities in excitation functions of experimental data, known in the literature as the Kink [2], the Strangeness Horn [3] and the Step [4], motivated the experimental program at CERN SPS to lower the collision energy in order to locate the onset of deconfinement, an absence of firm theoretical explanation of these irregularities was always the source of natural doubts about their relation to deconfinement PT.
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