Speaker
Description
Hadronic resonances serve as sensitive probes of late-stage rescattering and regeneration effects in heavy-ion and small-system collisions. Unlike long-lived hadrons, resonances decay on timescales that overlap with the hadronic phase itself, making their measured yields and kinematic properties directly sensitive to the interplay between regeneration (leads to enhancement) and rescattering (reduction of yields) in the hadronic medium. Two complementary observables, mean transverse momentum ($\langle p_{\rm{T}} \rangle$) and anisotropic flow ($v_2$), offer insights into collective behaviour: the former tracing radial-flow-driven mass ordering across particle species, the latter tracing the spatial anisotropy of the collision zone and its translation into momentum space. In this contribution, we present ALICE measurements of $\langle p_{\rm{T}} \rangle$ for both mesonic and baryonic resonances, including $\rho^0$, K(892)$^\pm$, $\Lambda$(1520), and $\Xi$(1530)$^0$, as a function of charged-particle multiplicity in pp collisions at $\sqrt{s}$ = 13.6 TeV, compared to the mass-ordering trends of $\pi$, K, and p to test the presence of radial-flow-like behaviour even in small collision systems. We also present ALICE results on the $v_2$ of K(892)$^0$ and $\phi$ resonances in Pb--Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 5.36 TeV, extracted using the scalar product method. Together, these observables constrain how resonance regeneration and rescattering evolve with collision system size, and how collectivity signatures persist from small to large systems. The results are compared with predictions from hydrodynamic-inspired models, which help to constrain the lifetime of the hadronic phase and to refine the underlying physics scenarios governing collective particle production at LHC energies.