Hadronic resonances production with ALICE at the LHC

TL;DR

This paper reports on ALICE measurements of short-lived hadronic resonances in various collision systems at the LHC, providing insights into the hadronic phase, particle production mechanisms, and medium effects in high-energy nuclear collisions.

Contribution

It presents the most recent resonance production results from ALICE across multiple collision systems and energies, offering new data for understanding hadronic interactions and medium effects.

Findings

Resonance yields vary with collision system and energy.

Particle ratios provide insights into strangeness production.

Results compare favorably with theoretical models.

Abstract

Measurements of the production of short-lived hadronic resonances are used to probe the properties of the late hadronic phase in ultra-relativistic heavy-ion collisions. Since these resonances have lifetimes comparable to that of the fireball, they are sensitive to the competing effects of particle re-scattering and regeneration in the hadronic gas, which modify the observed particle momentum distributions and yields after hadronisation. Having different masses, quantum numbers and quark content, hadronic resonances carry a wealth of information on different aspects of ion-ion collisions, including the processes that determine the shapes of particle momentum spectra, insight into strangeness production and collective effects in small collision systems. We present the most recent ALICE results on $\rho(770)^{0}$, K*(892)$^{0}$, $\phi(1020)$, $\Sigma(1385)^{\pm}$, $\Lambda(1520)$, $\Xi(1530)^{0}$ and $\Xi(1820)$ production at the LHC. They include measurements performed in pp, p--Pb and Pb--Pb collisions at different energies, as well as the latest results from the LHC Run 2 with Xe--Xe collisions at $\sqrt{s_{\rm NN}}$ = 5.44 TeV and with Pb--Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV. Collision energy, centrality and multiplicity differential measurements integrated yields and particle ratios are discussed in detail. A critical overview of these results are given through comparisons to measurements from other experiments and theoretical models.