$\Lambda$ and $\bar{\Lambda }$ global polarization from the core-corona model

Abstract

We report on work aimed to describe the $\Lambda$ and $\bar{\Lambda }$ global polarizations in a heavy-ion collision environment using the core-corona model, where the source of these hyperons is a high-density core and a less dense corona. We show that the overall properties of the polarization excitation functions can be linked to the relative abundance of $\Lambda$s and $\bar{\Lambda }$s coming from the core versus those coming from the corona. Both global polarizations peak at collision energies $\sqrt{s_{NN}}\lesssim 10$ GeV. The exact positions and heights of these peaks depend not only on a reversal of relative abundances with collision energy, but also on the centrality class, both related to the QGP volume and lifetime.

arXiv commentProceedings for the 37th Winter Workshop on Nuclear Dynamics