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

Collaboration HADES Collaboration, G. Agakishiev, O. Arnold, A. Balanda, D. Belver, A. Belyaev, J. C. Berger-Chen, A. Blanco, M. Böhmer, J. L. Boyard, P. Cabanelas, E. Castro, S. Chernenko, M. Destefanis, F. Dohrmann, A. Dybczak, E. Epple, L. Fabbietti, O. Fateev, P. FinocchiaroP. 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, 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, W. Kühn, A. Kugler, A. Kurepin, V. Ladygin, R. Lalik, J. S. Lange, S. Lang, K. Lapidus, A. Lebedev, T. Liu, L. Lopes, M. Lorenz, L. Maier, A. Mangiarotti, J. Markert, V. Metag, B. Michalska, D. Mihaylov, J. Michel, E. Morinière, 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, 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

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Abstract

The HADES data from p + Nb collisions at a center-of-mass energy of √sNN = 3.2 GeV are analyzed employing a statistical hadronization model. The model can successfully describe the production yields of the identified hadrons π0, η, Ʌ, K0s, ω with parameters Tchem = (99 ± 11) MeV and μb = (619 ± 34) 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 √SNN = 2.6 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 Ξ- 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.

Original languageEnglish
Article number178
JournalEuropean Physical Journal A
Volume52
Issue number6
DOIs
StatePublished - 1 Jun 2016

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