Dilepton production in pion-nucleon collisions in an effective field theory approach

TL;DR

This paper develops an effective field theory model for electron-positron pair production in pion-nucleon collisions, incorporating baryon resonances and fitting parameters to photoproduction data to predict dilepton spectra for upcoming experiments.

Contribution

It introduces a novel effective field theory model with 16 baryon resonances to describe dilepton production in pion-nucleon collisions, providing predictions for HADES experiments.

Findings

Predicted dilepton invariant mass spectra up to 1.9 GeV.

Model fitted to pion photoproduction data.

Provides theoretical predictions for upcoming experiments.

Abstract

We present a model of electron-positron pair production in pion-nucleon collisions in the exclusive reaction \pi N -> 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.