Feasibility of measuring the speed of sound of the quark-gluon plasma from the multiplicity and mean $p_T$ of ultracentral heavy-ion collisions

Lorenzo Gavassino, Henry Hirvonen, Jean-François Paquet +2

The mean transverse momentum $⟨p_T⟩$ of hadrons has been observed experimentally and in numerical simulations to have a power-law dependence on the hadronic multiplic…