Influence of hadronic resonances on the chemical freeze-out in heavy-ion collisions

P. Alba, V. Mantovani Sarti, J. Noronha-Hostler, P. Parotto, I. Portillo-Vazquez, C. Ratti, J. M. Stafford

Research output: Contribution to journalArticlepeer-review


Detailed knowledge of the hadronic spectrum is still an open question, which has phenomenological consequences on the study of heavy-ion collisions. A previous lattice QCD study concluded that additional strange resonances are missing in the currently tabulated lists provided by the Particle Data Group (PDG). That study identified the list labeled PDG2016+ as the ideal spectrum to be used as an input in thermal-model-based analyses. In this work, we determine the effect of additional resonances on the freeze-out parameters of systems created in heavy-ion collisions. These parameters are obtained from thermal fits of particle yields and net-particle fluctuations. For a complete picture, we compare several hadron lists including both experimentally discovered and theoretically predicted states. We find that the inclusion of additional resonances mildly influences the extracted parameters - with a general trend of progressively lowering the temperature - but is not sufficient to close the gap in temperature between light and strange hadrons previously observed in the literature.

Original languageEnglish (US)
Article number054905
JournalPhysical Review C
Issue number5
StatePublished - May 2020

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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