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

0461373 - ÚJF 2017 RIV US eng J - Journal Article
Agakishiev, G. - Arnold, O. - Balanda, A. - Belver, D. - Krása, Antonín - Křížek, Filip - Kugler, Andrej - Sobolev, Yuri, G. - Tlustý, Pavel - Wagner, Vladimír … Total 112 authors
Statistical hadronization model analysis of hadron yields in p plus Nb and Ar plus KCl at SIS18 energies.
European Physical Journal A. Roč. 52, č. 6 (2016), s. 178. ISSN 1434-6001. E-ISSN 1434-601X
R&D Projects: GA MŠMT LC07050
Institutional support: RVO:61389005
Keywords : heavy ion collisions * hyperon production * matter
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 2.833, year: 2016

The HADES data from p + Nb collisions at a center-of-mass energy of root s(NN) = 3.2 GeV are analyzed employing a statistical hadronization model. The model can successfully describe the production yields of the identified hadrons pi(0), eta, Lambda, K-s(0), omega with parameters T-chem = (99 +/- 11) MeV and mu(b) = (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 root s(NN) = 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 Xi(-) 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.
Permanent Link: http://hdl.handle.net/11104/0260979