Search

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. For heavy ions Pb-Pb at s N N = 2.76 and 5.02 TeV along with Xe-Xe at s N N = 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. [ABSTRACT FROM AUTHOR]