# Dielectron production in pion-nucleon reactions at intermediate energies

## TL;DR

This paper investigates dielectron production in pion-nucleon reactions at intermediate energies, emphasizing the role of the $ riangle$-isobar and providing theoretical predictions for experimental validation.

## Contribution

It presents a theoretical analysis highlighting the $ riangle$-isobar's dominance and offers predictions for dielectron mass distributions in pion-proton interactions.

## Key findings

- $ riangle$-isobar creation dominates dielectron production at certain energies.
- Theoretical distributions match experimental data satisfactorily.
- Predictions for $M_{e^+e_-}$ distributions are provided for future experiments.

## Abstract

Dielectron production in the $\pi N$ interaction at not large energies is studied. The dominant contribution of the $\Delta$-isobar creation in the intermediate state at incident pion momenta of about 0.3-0.4 GeV$/$c is shown. The experimental distributions over the angle and effective mass $M_{e^+e_-}$ of the $e^+e^-$ pair are described satisfactorily. This stimulated us to present theoretical predictions for the $M_{e^+e_-}$ distribution in the process $\pi^- p\rightarrow ne^+e^-$ at different incident momenta, which could be verified, for example, by the HADES experiments.