Speaker
Description
Event-by-event fluctuations of the mean transverse momentum, $\langle p_{\rm{T} }\rangle$, of charged particles produced in Pb--Pb and Xe--Xe collisions at $\sqrt {s_{\rm{NN} }}= 5.02 $ TeV and $\sqrt {s_{\rm{NN} }}= 5.44$ TeV, respectively, and pp collisions at $\sqrt s = 5.02 $ TeV are studied as a function of the charged-particle multiplicity using the ALICE detector at the LHC. Dynamical fluctuations are observed in all the three collision systems which indicates correlated particle emission. The peripheral A--A data exhibit a similar multiplicity dependence as that observed in pp. The central Pb--Pb and Xe--Xe collisions show a significant reduction of the fluctuation and are in quantitative agreement with previous measurements in Au--Au and Pb--Pb collisions at lower energies. The fluctuation has also been investigated for different transverse spherocity classes in pp collisions to understand the contribution from an underlying event.
