Influence of heavy resonances in SMASH

TL;DR

This paper updates the hadron resonance gas model with the PDG21+ particle list and standardizes decay processes to improve the accuracy of heavy-ion collision simulations.

Contribution

It introduces the PDG21+ particle list and converts all particle decays into 2-body decays for compatibility with SMASH.

Findings

Enhanced hadronic models with more particles improve agreement with lattice QCD.

Standardized decay processes lead to more consistent heavy-ion collision simulations.

Updated particle data impacts the equation of state and hadronic interactions.

Abstract

Recent lattice QCD results, comparing to a hadron resonance gas model, have shown the need for hundreds of particles in hadronic models. These extra particles influence both the equation of state and hadronic interactions within hadron transport models. Here, we introduce the PDG21+ particle list, which contains the most up-to-date database of particles and their properties. We then convert all particles decays into 2 body decays so that they are compatible with SMASH in order to produce a more consistent description of a heavy-ion collision.