# Statistical model analysis of hadron yields in proton-nucleus and heavy-ion collisions at SIS 18 energies

Abstract : The HADES data from p+Nb collisions at center of mass energy of $\sqrt{s_{NN}}$= 3.2 GeV are analyzed by employing a statistical model. Accounting for the identified hadrons $\pi^0$, $\eta$, $\Lambda$, $K^{0}_{s}$, $\omega$ allows a surprisingly good description of their abundances with parameters $T_{chem}=(99\pm11)$ MeV and $\mu_{b}=(619\pm34)$ MeV, which fits well in the chemical freeze-out systematics found in heavy-ion collisions. In supplement we reanalyze our previous HADES data from Ar+KCl collisions at $\sqrt{s_{NN}}$= 2.6 GeV with an updated version of the statistical 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. Special emphasis is put on feed-down contributions from higher-lying resonance states which have been proposed to explain the experimentally observed $\Xi^-$ excess present in both data samples.
Type de document :
Pré-publication, Document de travail
2015
Domaine :

http://hal.in2p3.fr/in2p3-01315024
Contributeur : Sophie Heurteau <>
Soumis le : jeudi 12 mai 2016 - 15:17:44
Dernière modification le : jeudi 11 janvier 2018 - 06:12:41

### Identifiants

• HAL Id : in2p3-01315024, version 1
• ARXIV : 1512.07070

### Citation

G. Agakishiev, O. Arnold, A. Balanda, D. Belver, A. Belyaev, et al.. Statistical model analysis of hadron yields in proton-nucleus and heavy-ion collisions at SIS 18 energies. 2015. 〈in2p3-01315024〉

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