PoS - Proceedings of Science
Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T05 Ultra-Relativistic Nuclear Collisions
Study of the hadron gas phase using short-lived resonances with ALICE
J. Lomker*  on behalf of the ALICE collaboration
Full text: pdf
Pre-published on: January 12, 2024
Published on: March 21, 2024
Short-lived hadronic resonances are unique tools for studying the hadron-gas phase that is created
in the late stages of relativistic heavy-ion collisions. Measurements of the yield ratios between
resonances and the corresponding stable particles are sensitive to the competing rescattering and
regeneration effects. These measurements in small collision systems, such as pp and p-Pb, are a
powerful method to reveal a possible short-lived hadronic phase. In addition, resonance production
in small systems is interesting to study the onset of strangeness enhancement, collective effects,
and the hadron production mechanism. On this front, the 𝜙 meson is particularly relevant since its
yield is sensitive to different production models: no effect is expected by strange number canonical
suppression but its production is expected to be enhanced in the rope-hadronization scenario.
In this presentation, recent measurements of hadronic resonances in different collision systems,
going from pp to Pb-Pb collisions, are presented. These include transverse momentum spectra,
yields, and yield ratios as a function of multiplicity. The presented results are discussed in the
context of state-of-the-art phenomenological models of hadron production. The resonance yields
measured in Pb-Pb collisions are used as an experimental input in a partial chemical equilibrium-
based thermal model to constrain the kinetic freeze-out temperature. This is a novel procedure
that is independent of assumptions on the flow velocity profile and the freeze-out hypersurface.
DOI: https://doi.org/10.22323/1.449.0216
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