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This contribution summarizes the main experimental results presented at the2009 Quark Matter conference concerning single and dilepton production inproton and heavy ion collisions at high energy. The dilepton invariant massspectrum has been measured over a range that extends from the $\pi^0$ mass tothe $\Upsilon$ mass, and for various collision energies at SPS, Fermilab, Heraand RHIC. This paper focuses on the various contributions (photons, low massvector mesons, open and hidden heavy flavors) to this spectrum and discusstheir implications on our understanding of the matter formed in heavy ioncollisions.

nuclear physics a

Early times and thermalization in heavy ion collisions: a summary of  experimental results for photons, light vector mesons, open and hidden heavy  flavors