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

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    0461373 - ÚJF 2017 RIV US eng J - Článek v odborném periodiku
    Agakishiev, G. - Arnold, O. - Balanda, A. - Belver, D. - Krása, Antonín - Křížek, Filip - Kugler, Andrej - Sobolev, Yuri, G. - Tlustý, Pavel - Wagner, Vladimír
    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
    Grant CEP: GA MŠk LC07050
    Institucionální podpora: RVO:61389005
    Klíčová slova: heavy ion collisions * hyperon production * matter
    Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
    Impakt faktor: 2.833, rok: 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.
    Trvalý link: http://hdl.handle.net/11104/0260979
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