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

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_{{\rm 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.

heavy ion: scattering
Monte Carlo
Glauber
HADES
impact parameter
time-of-flight
resistive plate chamber
geometry
nucleon
experimental methods

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