8-10 September 2022
Virtual
Mexico/General timezone
XXXVI Annual Meeting of the Division of Particles and Fields
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Contribution Plenary talks

Virtual - https://us06web.zoom.us/j/85040775843?pwd=ZnRsQkgxKzBPdStoY0Z5OU5QQ3p4QT09
QCD and Hadron Physics

Core Corona approach, a model to explain Hyperon Global Polarization and other phenomena in semi-central heavy-ion collisions at low energies

Speakers

  • Dr. Ivonne MALDONADO

Primary authors

Abstract

The study of heavy ion collisions at low energies is a topic of great interest since it was suggested that the onset of the hadron to quark matter transition should be expected at low energies where high baryon densities and lower temperatures dominates. To characterize the strongly interacting matter created in such type of collisions, several variables has been proposed, in particular hyperon global polarization, due to the possibility to link this observable to its vorticity, viscosity and flow, and shed light of criticality in the nuclear matter phase diagram. Recently experiments such as HADES, and BES at RHIC, measured the global polarization of Λ and Λ ̄ and so it has been observed that the global polarization increases as the energy of the collision decreases, being greater the effect for the Λ ̄. 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. We found that the relative abundance between one region and another influences global polarization, and it reaches a maximum at collision energies √sNN ≲ 10 GeV. In this talk I will show the details of the hyperon global polarization estimation and plans to apply it to other measurements in the frame of the MPD experiment.