Fluctuations of Mean Transverse Momentum in Pb–Pb and Xe–Xe Collisions on Event-by-Event Basis with ALICE

Event-by-event fluctuations of the mean transverse momentum, \(\langle p_\mathrm{{T} }\rangle \) , of charged particles produced in Pb–Pb and Xe–Xe collisions at \(\sqrt{s_\mathrm{{NN}}} = 5.02 \) TeV and \(\sqrt{s_\mathrm{{NN}}} = 5.44\) TeV, respectively, are studied as a function of the charged-particle multiplicity using the ALICE detector at the LHC. Dynamical fluctuations are observed in both collision systems which indicate correlated particle emission. The central Pb–Pb and Xe–Xe collisions show a significant reduction of the fluctuation in comparison to peripheral collisions and are in qualitative agreement with previous measurements in Pb–Pb collisions at \(\sqrt{s_\mathrm{{NN} }}= 2.76 \) TeV. The results are compared with calculations from the HIJING model. A clear deviation from simple superposition scenario, where the final state particles are produced from superposition of particle emitting sources, is observed.