Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 29: Schwerionenkollisionen und QCD Phasen
HK 29.7: Vortrag
Dienstag, 5. März 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.