Threshold Collision Energy of the QCD Phase Diagram Tricritical EndpointстатьяИсследовательская статья
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Статья опубликована в журнале из перечня ВАК
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:Using the most advanced formulation of the hadron resonance gas model we analyze the two sets
of irregularities found at chemical freeze-out of central nuclear-nuclear collisions at the center of mass ener-
gies 3.8–4.9 GeV and 7.6–9.2 GeV. In addition to previously reported irregularities at the collision energies
4.9 and 9.2 GeV we found sharp peaks of baryonic charge density. Also we analyze the collision energy depen-
dence of the modified Wroblewski factor and the strangeness suppression factor. Based on the thermostatic
properties of the mixed phase of a 1st order phase transition and the ones of the Hagedorn mass spectrum we
explain, respectively, the reason of observed chemical equilibration of strangeness at the collision energy
4.9 GeV and above 8.7 GeV. It is argued that the both sets of irregularities possibly evidence for two phase
transitions, namely, the 1st order transition at lower energy range and the 2nd order transition at higher one.
In combination with a recent analysis of the light nuclei number fluctuations we conclude that the center of
mass collision energy range 8.8–9.2 GeV may be in the nearest vicinity of the QCD tricritical endpoint. The
properties of the phase existing between two phase transitions are revealed and discussed.