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 root s = 5.02 and 13 TeV published by the ALICE Collaboration using the Color String Percolation Model. For heavy ions Pb-Pb at root s(NN) = 2.76 and 5.02 TeV along with Xe-Xe at root 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 E and the temperature the dimensionless quantity epsilon/T-4 is obtained. Our results for Pb-Pb and Xe-Xe collisions show a sharp increase in epsilon/T-4 above T similar to 210 MeV and reaching the ideal gas of quarks and gluons value of epsilon/T-4 similar to 16 at temperature similar to 230 MeV.