2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/81214Lattice QCD predicts a phase transition between hadronic matter and a system of deconfined quarks and gluons (the Quark Gluon Plasma) at high energy densities. Recent results from the Brookhaven Relativistic Heavy Ion Collider (RHIC) dedicated to the study of QCD at extreme densities will be discussed and compared to measurements obtained at the CERN Super Proton Synchrotron (SPS).16 pages, 18 figures, plenary talk at Beyond The Desert '03, Castle Ringberg, Germany, June 9, 2003. Version 2 replaces a figure which did not print everywhereNuclear Experimenttext