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Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Schwerionenkollisionen und QCD Phasen

HK 29.7: Talk

Tuesday, March 5, 2013, 15:45–16:00, HSZ-201

Heavy quarks in a (3+1) dimensional hybrid approach — •Thomas Lang — Frankfurt Institute for Advanced Studies (FIAS), Ruth-Moufang-Straße 1, D-60438 Frankfurt — Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt

We have implemented a Langevin approach for the transport of heavy quarks in the UrQMD hybrid model. Here two different sets of drag and diffusion coefficients are used, one based on a T-Matrix approach and one based on a resonance model. In case of the resonance model we have investigated the effects of different decoupling temperatures of the heavy quarks from the medium, ranging between 130 MeV and 180 MeV. We present calculations of the nuclear modification factor RAA, as well as of the elliptic flow v2 in Au+Au collisions at √sNN=200 GeV and Pb+Pb collisions at √sNN=2.76  TeV. In order to compare with data at RHIC and LHC we have implemented a Peterson fragmentation and a quark coalescence approach followed by the semileptonic decay of the D- and B-mesons to electrons. We find that our results strongly depend on the decoupling temperature and the hadronization mechanism. At a decoupling temperature of 130 MeV we reach a good agreement with the measurements at both, RHIC and LHC energies, simultaneously for the elliptic flow v2 and the nuclear modification factor RAA. We also make a prediction for the medium modification of charm quarks at FAIR energies.
Supported by the Hessian LOEWE initiative through the Helmholtz International Center for FAIR (HIC for FAIR), GSI, and HGS-HIRe.

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