Exploring the QGP phase above the deconfinement temperature in pp and A-A collisions at LHC energies

In the present work we have analyzed the transverse momentum spectra of charged particles in high multiplicity pp collisions at LHC energies √(s) = 5.02 and 13 TeV published by the ALICE Collaboration using the Color String Percolation Model (CSPM). For heavy ions Pb-Pb at √(s_NN) = 2.76 and 5.02 TeV along with Xe-Xe at √(s_NN) = 5.44 TeV have been analyzed. The initial temperature is extracted both in low and high multiplicity events in pp collisions. For A-A collisions the temperature is obtained as a function of centrality. A universal scaling in the temperature from pp and A-A collisions is obtained when multiplicity is scaled by the transverse interaction area.From the measured energy density ε and the temperature the dimensionless quantity ε/T^4 is obtained. Our results for Pb-Pb and Xe-Xe collisions show a sharp increase in ε/T^4 above T ∼ 210 MeV and reaching the ideal gas of quarks and gluons value of ε/T^4∼ 16 at temperature ∼ 230 MeV. In case of pp collisions only ε/T^4∼ 10 corresponding to ∼ 30 degrees of freedom.