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

J. Adamczewski-Musch , O. Arnold , C. Behnke , A. Belounnas (1) , A. Belyaev , J.C. Berger-Chen , J. Biernat , A. Blanco , C. Blume , M. Böhmer , P. Bordalo , L. Chlad , C. Deveaux , J. Dreyer , A. Dybczak , E. Epple , L. Fabbietti , O. Fateev , P. Filip , P. Fonte , C. Franco , J. Friese , I. Fröhlich , T. Galatyuk , J.A. Garzón , R. Gernhäuser , M. Golubeva , R. Greifenhagen , F. Guber , M. Gumberidze , S. Harabasz , T. Heinz , T. Hennino (1) , S. Hlavac , C. Höhne , R. Holzmann , A. Ierusalimov , A. Ivashkin , B. Kämpfer , T. Karavicheva , B. Kardan , I. Koenig , W. Koenig , B.W. Kolb , G. Korcyl , G. Kornakov , R. Kotte , W. Kühn , 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. Müntz , R. Münzer , L. Naumann , K.N. Nowakowski , M. Palka , Y. Parpottas , V. Pechenov , O. Pechenova , O. Petukhov , J. Pietraszko , W. Przygoda , S. Ramos , B. Ramstein (1) , A. Reshetin , P. Rodriguez-Ramos , P. Rosier (1) , A. Rost , A. Sadovsky , P. Salabura , T. Scheib , H. Schuldes , E. Schwab , F. Scozzi (1) , F. Seck , P. Sellheim , J. Siebenson , L. Silva , Yu.G. Sobolev , S. Spataro , H. Ströbele , 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

1 IPNO - Institut de Physique Nucléaire d'Orsay

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.

Mots clés: heavy ion: scattering; Monte Carlo; Glauber; HADES; impact parameter; time-of-flight; resistive plate chamber; geometry; nucleon; experimental methods; numerical calculations; 1.23 GeV/nucleon 2.42 GeV-cms/nucleon

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

J. Adamczewski-Musch, O. Arnold, C. Behnke, A. Belounnas, A. Belyaev, et al.. Centrality determination of Au + Au collisions at 1.23A GeV with HADES. Eur.Phys.J.A, 2018, 54 (5), pp.85. ⟨10.1140/epja/i2018-12513-7⟩. ⟨hal-01801970⟩