Abstract
Radiative transition of excited baryon to a nucleon with emission of a virtual massive photon decaying to dielectron pair (Dalitz decay) provides important information about baryon-photon coupling at low q 2 in timelike region. First measurements of such decays in proton-proton and quasi-free neutron-proton collisions have been conducted with the HADES detector at GSI/FAIR. The results for the Δ(1232) and higher mass resonances are presented. The extension of this program to pion induced reactions is outlined and illustrated with performance reached in the first pilot experiment.
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