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.
- Publication:
-
arXiv e-prints
- Pub Date:
- December 2015
- DOI:
- 10.48550/arXiv.1512.07070
- arXiv:
- arXiv:1512.07070
- Bibcode:
- 2015arXiv151207070A
- Keywords:
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- Nuclear Experiment;
- High Energy Physics - Experiment;
- Nuclear Theory