Altas Energías

Collisions at HADES, NICA and RHIC energies from the Core-Corona model

by Dr. Maldonado Cervantes Ivonne (FCFM, Universidad Autónoma de Sinaloa)

Wednesday, 1 December 2021 from to (Mexico/General)
at ICN-UNAM ( Seminario virtual vía Zoom )
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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. And that’s where the Λ and Λ-bar hyperons play an
important role because of their easy identification and analysis through their
charged decay.
Recently experiments at different energy ranges such as HADES (High Ac-
ceptance DiElectron Spectrometer), and BES (Beam Energy Scan), measured
the global polarization of Λ and Λ-bar 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-bar. 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 abun-
dance between one region and another influences global polarization, reaching
a maximum at the available energies of the HADES and MPD (MultiPurpose
Detector) experiment by NICA (Nuclotron-based Ion Collider fAcility).

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