Measurement of the di-electron mass spectrum in 12C+12C collisions at 2 AGeV by HADES Original Research Article

The physics program of the High Acceptance Di-Electron Spectrometer HADES at GSI is largely motivated by the aim to study medium modifications of hadrons predicted by many theoretical approaches, as well as by the need to shed light on the still unexplained results of the former DLS experiment. In this contribution the HADES experiment is outlined and first results obtained in 12C+12C collisions at 2 AGeV are presented.