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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Poster

HK 46.15: Poster

Donnerstag, 20. März 2014, 16:00–18:00, HZ Poster

Centrality determination in Au-Au collisions at 1.23 AGeV with HADES — •Behruz Kardan and Christoph Blume for the HADES collaboration — Goethe-Universiät, Frankfurt am Main

The determination of the reaction centrality is essential in the study of the properties of extreme QCD matter, because it is directly related to the initial geometrical properties of the collision and allows the comparison of observables with other experiments and with theoretical calculations.

In HADES the charged particle multiplicity measured with different detectors is used as a centrality estimator for Au+Au collisions at 1.23 AGeV. Based on Glauber model simulation we deduce the geometrical properties, such as the number of participating nucleons and the number of binary nucleon-nucleon collisions, by fitting the simulated charged particle distributions to the measured data.

By comparing these results to simulations based on the UrQMD event generator the resolutions and possible biases of different centrality estimators are determined.

Supported by Helmholtz Alliance EMMI, HIC for FAIR, GSI and HGS-HIRe