Dilepton production in proton-induced reactions at SIS energies with the GiBUU transport model

TL;DR

This paper uses the GiBUU transport model to simulate dilepton production in proton-induced reactions at SIS energies, comparing results with experimental data and highlighting the influence of baryon resonances on dilepton spectra.

Contribution

It demonstrates that baryon resonance effects significantly impact dilepton spectra in elementary and nuclear reactions, providing insights into nucleon resonance properties in the nuclear medium.

Findings

Resonance model reproduces experimental dilepton spectra

Baryon resonances contribute notably to dilepton yields

Nuclear medium effects influence resonance contributions

Abstract

We present dilepton spectra from p+p, d+p and p+Nb reactions at SIS energies, which were simulated with the GiBUU transport model in a resonance model approach. These spectra are compared to the data published by the HADES and DLS collaborations. It is shown that the $\rho$ spectral function includes non-trivial effects already in elementary reactions, due to production via baryon resonances, which can yield large contributions to the dilepton spectrum. Dilepton spectra from nuclear reactions in the energy range of the HADES experiment are thus found to be sensitive also to properties of nucleon resonances in the nuclear medium.