Dilepton Production in Transport-based Approaches

TL;DR

This paper examines how baryon interactions influence dilepton production in transport models, highlighting their significance at different energy scales and the challenges in modeling in-medium effects.

Contribution

It demonstrates the importance of baryon couplings in dilepton spectra and discusses modeling approaches at various energies.

Findings

Baryon couplings are crucial for understanding dilepton spectra.

Baryon resonances impact vacuum spectra via Dalitz-like contributions.

In-medium effects at high energies are complex and require advanced modeling techniques.

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 low energies (of a few GeV), the baryon resonances naturally play a larger role and affect already the vacuum spectra via Dalitz-like contributions, which can be captured well in an on-shell-transport scheme. At higher energies, the baryons mostly affect the in-medium self energy of the $\rho$, which is harder to tackle in transport models and requires advanced techniques.