Miklós Zétényi, György Wolf
We present a model of electron-positron pair production in pion-nucleon collisions in the exclusive reaction $\pi N \rightarrow Ne^+e^-$. The model is based on an effective field theory approach, incorporating 16 baryon resonances below 2 GeV. Parameters of the model are fitted to pion photoproduction data. We present the resulting dilepton invariant mass spectra for $\pi^- p$ collisions up to $\sqrt{s}=1.9$ GeV center-of-mass collision energy. These results are meant to give predictions for the planned experiments at the HADES spectrometer in GSI, Darmstadt.
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http://arxiv.org/abs/1208.5671
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