Abstract
Lepton pairs are considered as an ideal probe to access the microscopic properties of strongly-interacting matter under extreme conditions of temperature and density. The spectral distribution of lepton pairs in the region below the low mass vector mesons is characterized by an excess radiation above contributions from late meson decays, the so-called hadronic cocktail. It is theoretically understood as a thermal radiation based on Vector Meson Dominance assuming a strong broadening of the in-medium spectral function due to coupling to baryons and anti-baryons.In continuation of a systematic investigation of the emissivity of strongly interacting matter, HADES has recently measured the dielectron emission in Au+Au collisions at 1.23A GeV beam energy. The first measurement for Au+Au completes the systematics of dilepton production in NN/pA/AA collisions in the SIS18 energy range.This contribution will present new results for the Au+Au system based on a data sample of 5.0 billion events of the 40% most central collisions.
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