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HK: Fachverband Physik der Hadronen und Kerne

HK 6: Physik mit schweren Ionen

HK 6.4: Talk

Monday, March 10, 2008, 15:00–15:15, 2E

Elliptic flow and onset of deconfinement in a hydro+Boltzmann hybrid approach — •Hannah Petersen, Gerhard Burau, Jan Steinheimer, and Marcus Bleicher — Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Max-von-Laue-Strasse 1, D-60438 Frankfurt am Main

We present first results from a hydro+Boltzmann hybrid approach to heavy ion reactions from GSI-SIS to BNL-RHIC energies. Event-by-event fluctuations are directly taken into account via the non-equlibrium initial conditions generated by the microscopic UrQMD model. After the (3+1)-dimensional hydrodynamic evolution, the freezeout process is performed via the Cooper-Frye formula and an subsequent hadronic cascade calculation using again UrQMD to incorporate important final state effects.

We investigate the excitation function of elliptic flow (v₂) and compare the results from the hybrid approach to previous purely hadronic calculations. The influence of the hydrodynamical evolution and the phase transition on the elliptic flow is discussed in the context of the available experimental data. Furthermore, we investigate the expansion paths in the T-µ-plane using different equations of state. Defining a critical area around the critical point, we show at what beam energies one can expect to have a sizable fraction of the system close to the critical point. We explore how much energy is needed to reach the phase transition to the Quark-Gluon-Plasma in this approach.