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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Schwerionenkollisionen und QCD Phasen

HK 19.2: Vortrag

Dienstag, 18. März 2014, 14:30–14:45, HZ 6

Initial state properties in heavy ion collisions at RHIC and LHC energies — •Rudy Marty^1,2, Elena Bratkovskaya^1,2, Wolfgang Cassing³, and Jörg Aichelin⁴ — ¹FIAS, Frankfurt, Germany — ²ITP, Frankfurt, Germany — ³ITP, Giessen, Germany — ⁴Subatech, Nantes, France

The issue of initial conditions in relativistic heavy ion collisions is a subject of intensive debate. Especially the assumption of thermal equilibrium after ∼1 fm/c is currently not supported by microscopic transport approaches. In our study we compare the Parton-Hadron-String Dynamics (PHSD) with new transport approach RSP based on the Nambu-Jona-Lasinio (NJL) model, applying the same initial conditions from PHSD, which have a ‘lumpy’ energy density profile. The comparison of final hadronic observables shows that the initial parton distribution must be out of equilibrium in order to reproduce the multiplicity spectra dN/dp_T and dN/dη and the elliptic flow v₂ for Au+Au at RHIC energies. We also discuss the applicability of an equation of state and the applicability of a hydrodynamics for relativistic high energy collisions.