In-Medium Properties of Vector Mesons in a Transport Approach

TL;DR

This paper uses the GiBUU transport model to simulate dilepton spectra in proton-proton and proton-niobium collisions at 3.5 GeV, exploring how in-medium effects influence observable signals and comparing results to experimental data.

Contribution

It introduces a detailed transport simulation approach to study in-medium modifications of vector mesons and their electromagnetic transition form factors in low-energy collisions.

Findings

GiBUU reasonably reproduces HADES dilepton spectra

The intermediate mass region is sensitive to the N-Delta transition form factor

Simulations suggest in-medium effects significantly impact dilepton production

Abstract

We present dilepton spectra from p+p and p+Nb collisions at a kinetic beam energy of 3.5 GeV, which were simulated with the GiBUU transport model assuming different in-medium scenarios. We compare these spectra to preliminary HADES data and show that GiBUU can describe the data reasonably well. Our simulations indicate that the intermediate dilepton-mass region is sensitive to the N-Delta electromagnetic transition form factor, which up to now is unmeasured in the time-like region.