Abstract
HADES is the only operating dielectron spectrometer in the energy regime 1-2 AGeV. The physics program aims at a systematic investigation of dielectron production in heavy ion as well as elementary and pion-induced reactions. This contribution highlights recent results on electron pair production in 12C+12C collisions at an incident energy of 2 AGeV with HADES. The measured pair production probabilities span over five orders of magnitude. Dalitz decays of π0 and η account for all the yield up to 0.15 GeV/c2, but for only about 50% above this invariant mass. The excess yield compared to the hadronic cocktail between the π0-Dalitz and the ρ/ω invariant-mass region is in agreement with the former DLS result if one assumes that it scales with beam energy like pion production. Preliminary results from 12C+12C collisions at an incident energy of 1 AGeV support this scenario.
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