Statistical hadronization model analysis of hadron yields in p + Nb and Ar + KCl at SIS18 energies

G. Agakishiev , O. Arnold , A. Balanda , D. Belver , A. Belyaev , J. C. Berger-Chen , A. Blanco , M. Böhmer , J. L. Boyard (1) , P. Cabanelas , E. Castro , S. Chernenko , M. Destefanis , F. Dohrmann , A. Dybczak , E. Epple , L. Fabbietti , O. Fateev , P. Finocchiaro , P. Fonte , J. Friese , I. Fröhlich , T. Galatyuk , J. A. Garzón , R. Gernhäuser , C. Gilardi , K. Göbel , M. Golubeva , D. González-Díaz , F. Guber , M. Gumberidze , T. Heinz , T. Hennino (1) , R. Holzmann , A. Ierusalimov , I. Iori , A. Ivashkin , M. Jurkovic , B. Kämpfer , T. Karavicheva , I. Koenig , W. Koenig , B. W. Kolb , G. Kornakov , R. Kotte , A. Krása , F. Krizek , R. Krücken , H. Kuc (1) , W. Kühn , A. Kugler , A. Kurepin , V. Ladygin , R. Lalik , J. S. Lange , S. Lang , K. Lapidus , A. Lebedev , T. Liu (1) , L. Lopes , M. Lorenz , L. Maier , A. Mangiarotti , J. Markert , V. Metag , B. Michalska , D. Mihaylov , J. Michel , E. Morinière (1) , J. Mousa , C. Müntz , R. Münzer , L. Naumann , Y. C. Pachmayer , M. Palka , Y. Parpottas , V. Pechenov , O. Pechenova , J. Pietraszko , W. Przygoda , B. Ramstein (1) , L. Rehnisch , A. Reshetin , A. Rustamov , A. Sadovsky , P. Salabura , T. Scheib , A. Schmah , H. Schuldes , E. Schwab , J. Siebenson , Yu. G. Sobolev , S. Spataro , B. Spruck , H. Ströbele , J. Stroth , C. Sturm , A. Tarantola , K. Teilab , P. Tlusty , M. Traxler , R. Trebacz , H. Tsertos , T. Vasiliev , V. Wagner , M. Weber , C. Wendisch , J. Wirth , M. Wisniowski , J. Wüstenfeld , S. Yurevich , Y. Zanevsky

1 IPNO - Institut de Physique Nucléaire d'Orsay

The HADES data from p + Nb collisions at a center-of-mass energy of GeV are analyzed employing a statistical hadronization model. The model can successfully describe the production yields of the identified hadrons , , , K 0 s, with parameters MeV and MeV, which fit well into the chemical freeze-out systematics found in heavy-ion collisions. In addition, we reanalyze our previous HADES data from Ar + KCl collisions at GeV with an updated version of the model. We address equilibration in heavy-ion collisions by testing two aspects: the description of yields and the regularity of freeze-out parameters from a statistical model fit as a function of colliding energy and system size. Despite its success, the model fails to describe the observed yields in both, p + Nb and Ar + KCl . Special emphasis is put on feed-down contributions from higher-lying resonance states as a possible explanation for the observed excess.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]; Physique des Hautes Energies - Expérience [hep-ex]; Physique Nucléaire Théorique [nucl-th]

G. Agakishiev, O. Arnold, A. Balanda, D. Belver, A. Belyaev, et al.. Statistical hadronization model analysis of hadron yields in p + Nb and Ar + KCl at SIS18 energies. European Physical Journal A, 2016, 52 (6), pp.178. ⟨10.1140/epja/i2016-16178-x⟩. ⟨in2p3-01357202⟩