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We address the dilepton production from the parton interactions in the earlystage of relativistic heavy-ion collisions within the parton-hadron-stringdynamics (PHSD) off-shell transport approach. The description of partons inPHSD is based on the dynamical quasiparticle model (DQPM) matched to reproducelattice QCD results in thermodynamic equilibrium. According to the DQPM theconstituents of the strongly interacting quark-gluon plasma (sQGP) are massiveand off-shell quasi-particles (quarks and gluons) with broad spectralfunctions. In order to address the electromagnetic radiation of the sQGP, wederive off-shell cross sections of q+qbar->gamma*, q+qbar->gamma*+g andq+g->gamma*+q (qbar+g->gamma*+qbar) reactions taking into account the effectivepropagators for quarks and gluons from the DQPM. Dilepton production in In+Incollisions at 158 AGeV and in Au+Au at sqrt(s)=200 GeV is calculated byimplementing these off-shell processes into the PHSD transport approach. Bycomparing to the data of the NA60 and PHENIX Collaborations, we study therelative importance of different dilepton production mechanisms and point outthe regions in phase space where partonic channels are dominant.

Dilepton production from parton interactions in the early stage of relativistic heavy-ion collisions