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We study e^+e^- pair production in proton-proton and central Pb+Pb collisionsat sqrt(s_NN)=2.76 TeV within two models: an extended statistical hadronizationmodel (SHM) and the Parton-Hadron-String Dynamics (PHSD) transport approach. Wefind that the PHSD calculations roughly agree with the dilepton spectrum fromhadronic sources with the 'cocktail' estimates from the statisticalhadronization model matched to available data at LHC energies. The dynamicalsimulations within the PHSD show a moderate increase of the low mass dileptonyield essentially due to the in-medium modification of the rho-meson.Furthermore, pronounced traces of the partonic degrees of freedom are found inthe PHSD results in the intermediate mass regime. The dilepton production fromthe strongly interacting quark-gluon plasma (sQGP) exceeds that from thesemi-leptonic decays of open charm and bottom mesons. Additionally, we observethat a transverse momentum cut of 1 GeV/c further suppresses the relativecontribution of the heavy meson decays to the dilepton yield, such that thesQGP radiation strongly dominates the spectrum for masses from 1 to 3 GeV,allowing a closer look at the electromagnetic emissivity of the partonic plasmain the early phase of Pb+Pb collisions.

Dilepton production in proton-proton and Pb+Pb collisions at sqrt(s_NN)=2.76 TeV