Perspectives and issues of $\Lambda$ and $\bar\Lambda$ global polarization in Heavy Ion Collisions from the Core-Corona model

• Ivonne Maldonado (LHEP, JINR)

The study of hyperons and their global polarization is a topic of great interest in the study of strongly interacting matter produced in heavy-ion collisions, because it, has been associated with the properties of this medium. In particular, It has been studied the possibility that the spin of hadrons be aligned along the global vorticity produced in semi-central collisions and this can be estimated in terms of global polarization. Recently experiments at different energy ranges such as HADES (High Acceptance DiElectron Spectrometer), and BES (Beam Energy Scan), measured the global polarization of $\Lambda$ and $\bar\Lambda$ and so it has been observed that the global polarization increases as the energy of the collision decreases, being greater the effect for the $\bar\Lambda$. To describe this behavior, we have implemented the Core-Corona model, which assumes that in non-central heavy ion collisions, hyperons come from different density regions of the created system, and the relative abundance between one region and another influences global polarization. In MPD (Multi-Purpose Detector) experiment, will have a great opportunity to give a detailed description of Hyperon Global Polarization, that reaches a maximum at the available energies of NICA (Nuclotron-based Ion Collider fAcility). In this presentation we will describe the core-corona model implemented to describe the global polarization, its issues and its perspectives.

Discussion