Skewness of event-by-event $\langle p_\mathrm{T}\rangle$ distribution of charged particles at LHC energies with ALICE

In ultrarelativistic heavy-ion collisions, a hot and dense nuclear state of matter known as the quark–gluon plasma (QGP) is formed, in which quarks and gluons are no longer confined within hadrons. The space–time evolution of the QGP is known to be governed by hydrodynamic equations of state. In a recent publication, it was suggested that skewness of event-by-event (e-by-e) mean transverse momentum (hpTi) distribution can help to study the hydrodynamic behaviour of the system produced in heavy-ion collisions. Hydrodynamic simulations predict that the hpTi fluctuations are positively skewed, larger than in the independent particle emission scenario. The skewness of the hpTi fluctuations has been related to the fluctuations of initial state energy density. Event-by-event fluctuations in the initial state of a collision arise due to fluctuations in the positions of participating nucleons. In this work, the first measurements of skewness of e-by-e hpTi distribution are presented, as a function of average charged-particle pseudorapidity density hdNch/dηi|η|<0.5 in pp collisions at √ s = 5.02 TeV and Pb–Pb (Xe–Xe) collisions at √ sNN = 5.02 (5.44) TeV using the data recorded by the ALICE detector.