Abstract
The study of hadronic resonances plays an important role both in pp and in heavy-ion collisions. Since the lifetimes of short-lived resonances are comparable with the lifetime of the fireball formed in heavy-ion collisions, regeneration and re-scattering effects can modify the measured yields, especially at low transverse momentum. Measurements in pp collisions at different energies constitute a baseline for studies in heavy-ion collisions and provide constraints for tuning QCD-inspired event generators. Furthermore, high multiplicity pp collisions, where the density and the volume of the system are expected to be larger compared to minimum bias pp collisions, can help in the search for the onset of collective phenomena. Here we present recent results on short-lived hadronic resonances obtained by the ALICE experiment at LHC energies in different collision systems (pp, p–Pb and Pb–Pb) including new results obtained in Xe–Xe collisions. The ALICE results on transverse momentum spectra, yields and their ratios to long-lived particles will be discussed.
Highlights
One of the main motivations for studying hadronic resonance production in heavy-ion collisions is to learn more about the properties of the hadronic phase, the latestage evolution of these collisions
This paper presents the recent results on hadronic resonance production from the ALICE experiment
One can observe that particle production is independent of collision system and collision energy at LHC energies and it is driven by the event multiplicity
Summary
One of the main motivations for studying hadronic resonance production in heavy-ion collisions is to learn more about the properties (temperature and lifetime) of the hadronic phase, the latestage evolution of these collisions. In order to check the presence of a suppression in the production of the resonances and to study whether the strength of the suppression is related to the system size, the ratios of the pT-integrated particle yields ρ0/π, K∗0/K, Σ∗±/Σ, Λ∗/Λ, Ξ∗/Ξ and φ/K have been reported as a function of the cubic root of the charged particle multiplicity density dNch/dη 1/3 for different colliding systems; pp at 7 TeV, p–Pb at 5.02 TeV, Pb–Pb at 2.76 and 5.02 TeV and Xe–Xe collisions at 5.44 TeV nucleon-nucleon centre of mass energies (Fig. 3). No centrality dependence across the different systems is observed for resonances such as the φ and the Ξ∗ which live longer than the K∗0 and the ρ0 They decay predominantly after the end of the hadronic phase and their yield should not be affected by the regeneration and the re-scattering effect. K*/K φ/K d-Au, p-Pb, and A-A Data: High Mult
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