Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-09-15
J.Phys. G31 (2005) S69-S76
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 5 figures, Talk given at the Hot Quarks 2004 Workshop, Taos,NM, July 18-24 2004
Scientific paper
10.1088/0954-3899/31/4/009
A model for the evolution of ultrarelativistic heavy-ion collisions at both CERN SPS and RHIC top energies is presented. Based on the assumption of thermalization and a parametrization of the space-time expansion of the produced matter, this model is able to describe a large set of observables including hadronic momentum spectra, correlations and abundancies, the emission of real photons, dilepton radiation and the suppression pattern of charmonia. Each of these obervables provides unique capabilities to study the reaction dynamics and taken together they form a strong and consistent picture of the evolving system. Based on the emission of hard photons measured at SPS, we argue that a strongly interacting, hot and dense system with temperatures above 250 MeV has to be created early in the reaction. Such a system is bound to be different from hadronic matter and likely to be a quark-gluon plasma, and we find that this assumption is in line with the subsequent evolution of the system that is reflected in other observables.
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