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We study dilepton production in proton-proton, Cu+Cu as well as in Au+Aucollisions at the center-of-mass energy 200 GeV per participating nucleon pairwithin an extended statistical hadronization model. In extension to earlierstudies we incorporate transport calculations for an estimate of uncorrelatede+e- -pairs from semileptonic D meson decays. While the invariant mass spectrumof dielectrons is well understood in the p+p collisions, severe discrepanciesamong different model scenarios based on hadronic degrees of freedom and recentdata from the PHENIX Collaboration are found in heavy-ion collisions in the lowmass region from 0.15 to 0.6 GeV as well as in the intermediate mass regimefrom 1.1 to 3 GeV when employing the standard dilepton sources. We investigate,furthermore, the background from correlated dileptons that are not emitted as apair from a parent hadron but emerge from semileptonic decays of two correlateddaughter hadrons. Our calculations suggest a sizeable contribution of suchsources in central heavy-ion collisions in the low mass region. However, eventhe upper limits of our calculations are found to be far below the dileptonmass spectra of the PHENIX Collaboration.

Dilepton production in p+p, Cu+Cu and Au+Au collisions at 200 AGeV