Centrality determination of Au+Au collisions at 1.23A GeV with HADES

TL;DR

This paper presents a method to determine collision centrality in Au+Au collisions at 1.23A GeV using HADES data, employing a Glauber Monte Carlo model adapted for low-energy conditions to define centrality classes.

Contribution

It introduces a specialized Glauber Monte Carlo approach for low-energy heavy-ion collisions, enabling precise centrality classification at 1.23A GeV.

Findings

Established a procedure for centrality determination at low energies.

Validated the Glauber Monte Carlo model for 2.42 GeV collisions.

Provided a framework for analyzing heavy-ion collision geometry.

Abstract

The centrality determination for Au+Au collisions at 1.23A GeV, as measured with HADES at the GSI-SIS18, is described. In order to extract collision geometry related quantities, such as the average impact parameter or number of participating nucleons, a Glauber Monte Carlo approach is employed. For the application of this model to collisions at this relatively low centre-of-mass energy of $\sqrt{s_{\mathrm{NN}}} = 2.42$ GeV special investigations were performed. As a result a well defined procedure to determine centrality classes for ongoing analyses of heavy-ion data is established.