Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-10-17
PoSCPOD07:035,2007
Physics
Nuclear Physics
Nuclear Experiment
6 pages, 3 figures, conference proceedings: Critical Point and Onset of Deconfinement - 4th International Workshop, July 9 - 1
Scientific paper
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 C12+C12 collisions at an incident energy of 2 AGeV with HADES. The measured pair production probabilities span over five orders of magnitude. Dalitz decays of pi0 and eta 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 pi0-Dalitz and the rho/omega 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 C12+C12 collisions at an incident energy of 1 AGeV support this scenario.
HADES collaboration for the
Muentz C.
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