Münster 2011 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Schwerionenkollisionen und QCD Phasen VI
HK 49.2: Group Report
Thursday, March 24, 2011, 14:30–15:00, HS AP
Quark degrees of freedom in a hybrid approach to heavy ion collisions — •Jan Steinheimer1,2, Elvira Santini1,2, Björn Bäuchle1,2, George Moschelli1,2, Thomas Lang1,2, Gunnar Gräf1,2, Marlene Nahrgang1,2, Christoph Herold1,2, and Marcus Bleicher1,2 — 1Institut für theoretische Physik, Goethe Universität Frankfurt am Main — 2Frankfurt Institute for Advanced Studies
We will present recent results obtained with the UrQMD hybrid model for heavy ion collisions.
In this approach an intermediate hydrodynamic stage is used to model the
hot and dense phase of heavy ion collisions. An equation of state that incorporates a chiral as well
as a deconfinement phase transition in accordance with lattice results is implemented and its effects on different bulk
observables is studied. While hadron multiplicities and bulk flow observables seem independent on the underlying degrees of
freedom we observe a dependence of di-lepton and photon production.
Furthermore we will show how the model can be used to separate the system, created in a heavy ion collision, into an equilibrated
core and a dilute corona. In such a scenario we use the hydrodynamic approach only for the dense core of the system while the
dilute outer region is described by the transport model. Within our model, such a separation is able to explain observables
like the position and with of the horn in the K+/π+ ratio as a transition from systems out of equilibrium to systems
that are in chemical and thermal equilibrium.