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The performed systematic meta-analysis of the quality of data description(QDD) of existing event generators of nucleus-nucleus collisions allows us toextract a very important physical information. Our meta-analysis is dealingwith the results of 10 event generators which describe data measured in therange of center of mass collision energies from 3.1 GeV to 17.3 GeV. Itconsiders the mean deviation squared per number of experimental points obtainedby these event generators, i.e. the QDD, as the results of independentmeta-measurements. These generators and their QDDs are divided in two groups.The first group includes the generators which account for the quark-gluonplasma formation during nuclear collisions (QGP models), while the second groupincludes the generators which do not assume the QGP formation in suchcollisions (hadron gas models). Comparing the QDD of more than a hundred ofdifferent data sets of strange hadrons by two groups of models, we found tworegions of the equal quality description of data which are located at thecenter of mass collision energies 4.4-4.87 GeV and 10.8-12 GeV. At thecollision energies below 4.4 GeV the hadron gas models describe data muchbetter than the QGP one and, hence, we associate this region with hadron phase.At the collision energies between 5 GeV and 10.8 GeV and above 12 GeV we foundthat QGP models describe data essentially better than the hadron gas ones and,hence, these regions we associate with the quark-gluon phase. As a result, thecollision energy regions 4.4-4.87 GeV and 10.8-12 GeV we interpret as theenergies of the hadron-quark-gluon mixed phase formation. Based on thesefindings we argue that the most probable energy range of the QCD phase diagram(tri)critical endpoint is 12-14 GeV.

A possible evidence of the hadron-quark-gluon mixed phase formation in nuclear collisions