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In this work, a study of the average transverse momentum (pt) as a functionof the mid-rapidity charged hadron multiplicity (Nch) and hadron mass (m) inp-Pb and Pb-Pb collisions at LHC energies is presented. For the eventsproducing low Nch, the average pt is found to scale with the reduced hadronmass, i.e., mass divided by the number of quark constituents (m/nq), thisscaling also holds for inelastic pp collisions at RHIC and LHC energies. Thescaling is broken in high multiplicity p-Pb and Pb-Pb collisions, where, for<Nch/deta> < 60 the average pt is higher for baryons than that for mesons,though they increase linearly with m/nq. This behavior is qualitatively wellreproduced by Pythia 8, but not by hydro calculations, where an universalscaling with the hadron mass (and not with m/nq) is predicted for all themultiplicity event classes. Only the central (0-60%) Pb-Pb collisions behave asexpected from hydro.

Mean pt scaling with m/nq at the LHC: Absence of (hydro) flow in small systems?