Polarization of Λ0 hyperons in nucleus-nucleus collisions at high energies

Abstract

The measurement of Λ 0 hyperons polarization in nucleus-nucleus collisions is considered as one of possible tools to study the phase transition. Fixed target and collider experiments are discussed for the case of Λ 0 's production from Au − Au central collisions at √ s N N ∼ of several GeV.

Polarization effects in hadronic reactions in a GeV region

“…The study of the modification of the Λ 0 transverse polarization and global Λ 0 polarization at NICA and FAIR energies has been proposed in ref. [88]. Recently the vorticity and hydrodynamical helicity in noncentral heavyion collisions were studied for Nuclotron/NICA energies as the functions of the energy collision, system size etc.…”

Rise and fall of $Λ$ and $\barΛ$ global polarization in semi-central heavy-ion collisions at HADES, NICA and RHIC energies from the core-corona model

“…The polarization properties of Λ and Λ have received increasing attention over the last years due to the possibility to link this observable to the properties of the medium produced in relativistic heavy-ion collisions [1][2][3][4][5][6][7][8][9][10][11][12][13]. For semi-central collisions, the matter density profile in the transverse plane develops an angular momentum [14] which can be quantified in terms of the thermal vorticity [15].…”

Two-component source to explain $Λ$ and $\barΛ$ global polarization in non-central heavy-ion collisions

“…The polarization of particles along a preferred direction sheds light on how these properties are linked to those of the medium produced in the reaction, which in turn are associated with the initial conditions and the dynamics of the Quark Gluon Plasma (QGP). In these reactions, the possibility to create a vortical fluid can be quantified in terms of the thermal vorticity [1][2][3][4][5][6][7][8][9][10][11][12][13].…”