EMMI Workshop: Light-ion collisions 2026

In the study of spin-polarization phenomena in heavy-ion collisions, it is typically assumed that final-state particles are polarized through thermal vorticity and shear. In this sense, polarization is a final-state effect. Here, we propose a different mechanism. We postulate that the collision of spin-carrying nucleons generates an initial transverse spin density, inducing a net polarization...

In light of the coming measurement of local hyperon polarization by the ALICE collaboration in OO runs, we present a prediction for the local Ξ and Λ polarization computed using Trajectum [1], based on Trajectum’s predictions for other OO observables[2]. Trajectum implements the polarization formula computed by Becattini et al. [3] for a Dirac field in a local thermal equilibrium state with...

The polarization of Λ hyperons provides a sensitive probe of the space-time structure of the quark-gluon plasma, and in particular of the gradients of the hydrodynamic fields. Longitudinal polarization is especially sensitive to the interplay between vorticity, shear, and transport properties such as the bulk viscosity. In this talk, we review a model based on (3+1)D average event viscous...