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We address dilepton production in Au+Au collisions at sqrt(s_NN)=200 GeV byemploying the parton-hadron-string dynamics (PHSD) off-shell transportapproach. Within the PHSD one goes beyond the quasiparticle approximation bysolving generalized transport equations on the basis of the off-shellKadanoff-Baym equations for the Green's functions in the phase-spacerepresentation. The approach consistently describes the full evolution of arelativistic heavy-ion collision from the initial hard scatterings and stringformation through the dynamical deconfinement phase transition to thequark-gluon plasma (QGP) as well as hadronization and to the subsequentinteractions in the hadronic phase. {With partons described in the PHSD by thedynamical quasiparticle model (DQPM) - matched to reproduce lattice QCD resultsin thermodynamic equilibrium} - we calculate, in particular, the dileptonradiation from partonic interactions through the reactions q+qbar->gamma^*,q+qbar->gamma^*+g and q+g->gamma^*+q (qbar+g->gamma^*+qbar) in the early stageof relativistic heavy-ion collisions. By comparing our results to the data fromthe PHENIX Collaboration, we study the relative importance of differentdilepton production mechanisms and point out the regions in phase space wherepartonic channels are dominant. Furthermore, explicit predictions are presentedfor dileptons within the acceptance of the STAR detector system and compared tothe preliminary data.

Analysis of dilepton production in Au+Au collisions at sqrt(s_NN)=200 GeV within the Parton-Hadron-String Dynamics (PHSD) transport approach