Particle Production in AgAg Collisions at $E_{\rm Kin}=1.58A$ GeV within a Hadronic Transport Approach

TL;DR

This paper uses a hadronic transport model to predict particle production and dilepton spectra in AgAg collisions at 1.58A GeV, providing insights into high-density nuclear matter and strange baryon yields.

Contribution

It introduces a novel prediction of particle yields and dilepton spectra in AgAg collisions at low energies using the SMASH transport approach, including mechanisms for rare baryon decays.

Findings

Predicted multiplicities and spectra follow expected system size trends.

Incorporated a mechanism for $ ext{Xi}$ baryon production via high-mass $N^*$ decays.

Dilepton emission spectra are similar across different collision systems and energies.

Abstract

Heavy-ion collisions at low beam energies explore the high density regime of strongly-interacting matter. The dynamical evolution of these collisions can be successfully described by hadronic transport approaches. In March 2019, the HADES collaboration has taken data for AgAg collisions at $E_{\rm Kin}=1.58A$ GeV and in this work, we provide predictions for particle production and spectra within the Simulating Many Accelerated Strongly-interacting Hadrons (SMASH) approach. The multiplicities and spectra of strange and non-strange particles follow the expected trends as a function of system size. In particular, in AuAu collisions, much higher yields of double-strange baryons were observed experimentally than expected from a thermal model. Therefore, we incorporate a previously suggested mechanism to produce $\Xi$ baryons via rare decays of high mass $N^*$ resonances and predict the multiplicities. In addition, we predict the invariant mass spectrum for dilepton emission and explore the most important sources of dileptons above 1 GeV, that are expected to indicate the temperature of the medium. Interestingly, the overall dilepton emission is very similar to the one in AuAu collisions at $1.23 A$ GeV, a hint that the smaller system at a higher energy behaves very similar to the larger system at lower beam energy.