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We implement a Langevin approach for the transport of charm quarks in theUrQMD (hydrodynamics + Boltzmann) hybrid model. Due to the inclusion ofevent-by-event fluctuations and a full (3+1) dimensional hydrodynamicevolution, this approach provides a more realistic model for the evolution ofthe matter produced in heavy ion collisions as compared to simple homogeneousfireball expansions usually employed. As drag and diffusion coefficients we usea resonance approach for elastic heavy-quark scattering and assume a decouplingtemperature of the charm quarks from the hot medium of 130 MeV. A coalescenceapproach at the decoupling temperature for the hadronization of the charmquarks to D-mesons is also included. We present calculations of the nuclearmodification factor R_AA as well as the elliptic flow v_2 in Pb+Pb collisionsat sqrt s_NN=2.76 TeV. The comparison to ALICE measurements shows a very goodagreement with our calculations.

Charm quark transport in Pb+Pb reactions at sqrt{s}_NN=2.76 TeV from a (3+1) dimensional hybrid approach