Dilepton Production in Transport-based Approaches

TL;DR

This paper studies dilepton production using transport models, emphasizing the importance of baryon couplings of the rho meson and baryon resonances in explaining experimental spectra.

Contribution

It highlights the crucial role of baryon couplings and resonances in dilepton production within transport approaches, supported by comparison with experimental data.

Findings

Baryon couplings of the rho meson are key to understanding dilepton spectra.

Baryon resonances significantly influence vacuum spectra via Dalitz-like contributions.

Recent pion-beam data can help refine resonance properties.

Abstract

We investigate dilepton production in transport-based approaches and show that the baryon couplings of the $\rho$ meson represent the most important ingredient for understanding the measured dilepton spectra. At SIS energies, the baryon resonances naturally play a major role and affect already the vacuum spectra via Dalitz-like contributions, which can be captured well in transport simulations. Recent pion-beam measurements at GSI will help to constrain the properties of the involved resonances further.