Global Polarization of Ξ and Ω Hyperons in Au+Au Collisions at

J. Adam¹,

L. Adamczyk²,

Alexandra Adams³

et al.

Lambda polarization in $^{108}$Ag +$^{108}$Ag and $^{197}$Au +$^{197}$Au collisions around a few GeV

“…Another feature is that both Λ and Λ global polarization decrease with increasing collision energy √ s NN ≥ 7.7 GeV which is consistent with the collision energy dependence of fluid vorticity at mid-rapidity [13,14]. The calculations from hydrodynamical [15,16] and transport-model approaches can explain well the experimental results for global Λ polarization [17][18][19][20][21][22][23][24][25] and also Ξ and Ω polarization [25][26][27], eg., see Refs. [28][29][30][31][32][33] for reviews.…”

Relativistic spin hydrodynamics with torsion and linear response theory for spin relaxation

“…However, the recent experimental observation of spin polarization of hadrons in relativistic heavy-ion collisions [7][8][9][10] strongly motivates the development of the theory describing spin transport in relativistic plasma, in particular, the quark-gluon plasma (QGP). This motivation has led to several theoretical studies of relativistic hydrodynamics with spin polarization, based on the second law of thermodynamics [11][12][13][14][15], equilibrium partition functions [15], quantum kinetic theory of relativistic fermions [16][17][18][19][20][21][22][23][24][25], holographic approach for strongly-coupled plasma [26][27][28], effective Lagrangian approach [29][30][31][32], and JHEP11(2021)150 quantum statistical density operators [33][34][35][36][37] (see also refs.…”

Testing the impact of electromagnetic fields on the directed flow of constituent quarks in heavy-ion collisions

“…We have ignored the fact that because these hyperon species are reconstructed via their weak decays, their measured flow is subject to uncertainties related to reconstruction and background contamination [38]. However, the STAR collaboration has published global polarization results for these hyperon species [39] and has demonstrated that such uncertainties can be minimized. In the case of Ξ and Ω using the Kalman Filter reconstruction method [40][41][42], a purity of 90% is achieved, which is about 30% better than the traditional method of Ξ and Ω reconstruction previously used for BES-I data [38].…”