Abstract
One of the physics goals of HADES is to investigate spectral modifications of light vector mesons in strongly interacting matter via their dielectron (e+e−) decay channel. Theoretical models predict such modifications due to strong meson-baryon resonance coupling which can be also probed in elementary collisions. In 2007 electron-positron pair production has been measured in p+p reactions at a beam kinetic energy of 3.5 GeV. We present analysis results of the exclusive channels ppπ0, pnπ+, ppe+e−, which indicate contributions of higher resonances. In order to estimate production cross sections of the baryonic resonances, the results have been compared to Monte Carlo calculations based on a resonance model assuming an incoherent sum of various four-star resonances. To obtain the corresponding e+e− yields, two models of the width parametrization are applied in the simulation.
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