2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/180737Recent PHENIX elliptic flow ($v_2$) measurements for identified particles produced in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}=200$ GeV are presented and compared to other RHIC measurements. They indicate universal scaling of $v_2$ compatible with partonic collectivity leading to the flow of light, strange and heavy quarks with a common expansion velocity field.Proceedings, Quark Matter 2006, Shanghai, ChinaNuclear Experimenttext