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Status of the HADES physics program and the upgrade project

In 2006 the analysis of the C+C data taken at a beam energy of 2 AGeV was finalized and the results for electron pair production published. The data exhibit an extra yield above the contribution expected from hadron decays after freeze-out for invariant masses above Me+e−> 150 MeV/c. A comparison to the DLS data, which was measured in the system C+C at 1.04 AGeV, reveals that the yield observed beyond the contribution from the η Dalitz decay increases with the beam energy like pion production. Further information on the origin of this excess is expected from the final results of the HADES run on C+C at 1 AGeV and from studies of dielectron production in elementary reactions at low beam energies (1.25 GeV). The latter were started with a p+p run in May 2006 and will be continued in April 2007 with a d+p experiment, which will provide sensitivity to iso-spin effects in resonance production. This experiment will be followed by a high-resolution ω → e+e− measurement in p + p reactions at 3.5 GeV providing a reference for later studies of the ω line shape in p + A reactions. The HADES upgrade program is well progressing. It will put the spectrometer in the condition to cope with the highest particle multiplicities and will further increase its rate capability.