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

HADES collaboration: J. Adamczewski-Musch , O. Arnold , C. Behnke , A. Belounnas , A. Belyaev , S. Chernenko , L. Chlad , C. Deveaux

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J. Dreyer A. Dybczak E. Epple L. Fabbietti O. Fateev P. Filip P. Fonte C. Franco J. Friese I. Froehlich T. Galatyuk J. A. Garzon R. Gernhaeuser M. Golubeva R. Greifenhagen F. Guber M. Gumberidze S. Harabasz T. Heinz T. Hennino S. Hlavac C. Hoehne R. Holzmann A. Ierusalimov A. Ivashkin B. Kaempfer T. Karavicheva B. Kardan I. Koenig W. Koenig B. W. Kolb G. Korcyl G. Kornakov R. Kotte W. Kuehn A. Kugler T. Kunz A. Kurepin A. Kurilkin P. Kurilkin V. Ladygin R. Lalik K. Lapidus A. Lebedev L. Lopes M. Lorenz T. Mahmoud L. Maier A. Mangiarotti J. Markert S. Maurus V. Metag J. Michel D.M. Mihaylov S. Morozov C. Muentz R. Muenzer L. Naumann K. N. Nowakowski M. Palka Y. Parpottas V. Pechenov O. Pechenova O. Petukhov J. Pietraszko W. Przygoda S. Ramos B. Ramstein A. Reshetin P. Rodriguez-Ramos P. Rosier A. Rost A. Sadovsky P. Salabura T. Scheib H. Schuldes E. Schwab F. Scozzi F. Seck P. Sellheim J. Siebenson L. Silva Yu.G. Sobolev S. Spataro H. Stroebele J. Stroth P. Strzempek C. Sturm O. Svoboda M. Szala P. Tlusty M. Traxler H. Tsertos E. Usenko V. Wagner C. Wendisch M.G. Wiebusch J. Wirth Y. Zanevsky P. Zumbruch

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keywords centralitycollisionsdeterminationhadesanalysesapplicationapproachaverage

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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.

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

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