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

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arxiv 1712.07993 v2 pith:BVTS75J6 submitted 2017-12-21 nucl-ex

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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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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Cited by 2 Pith papers

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    nucl-th 2026-07 conditional novelty 4.0

    A LightGBM model trained on pion observables from one transport model predicts impact parameters in Au+Au collisions at 4 and 11 GeV with 0.2-0.4 fm error, generalizing to data from other models where polynomial fits fail.

  2. Hadron polarization and equation of state at FAIR/RHIC-BES energies

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    Lambda polarization in low-energy heavy-ion collisions depends on the equation of state in UrQMD simulations and arises from shear in the baryon current due to stopping.