Statistical Thermal Studies of 5.02 TeV Pb-Pb Collisions

The statistical thermal model THERMUS is used to investigate, for the first time, freeze-out parameters obtained for central Pb-Pb collisions at √sNN = 5.02 TeV. Fits to the ALICE data are performed allowing for a systematic study of the freeze-out conditions of the Quark Gluon Plasma created in nucleus-nucleus at the highest LHC energy. The main results are a chemical freeze-out temperature of 151±2 MeV, a volume is 8350−+590 fm3 with a large χ2/Ndf of 56.1/7. When trying to understand the origin of this significant χ2/Ndf , we observe that proton yields are suppressed compared to the model expectations which could suggest the need for different values of chemical freeze-out temperature for different species. Thermal model parameters obtained at 5.02 TeV are compared with former results for Pb-Pb collisions at 2.76 TeV.