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Inclusive production of e+e--pairs in pp and dp collisions at a kinetic beamenergy of 1.25 GeV/u has been studied with the HADES spectrometer. In thelatter case, the main goal was to obtain data on pair emission in quasi-free npcollisions. To select this particular reaction channel the HADES experimentalsetup was extended with a Forward Wall hodoscope, which allowed to registerspectator protons. Here, the measured invariant mass distributions demonstratea strong enhancement of the pair yield for M > 140 MeV/c2 in comparison to ppdata.

Dielectron production in pp and dp collisions at 1.25 GeV/u with HADES