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Hyperon production in Bi + Bi collisions at the nuclotron-based ion collider facility and angular dependence of hyperon spin polarization
Title Hyperon production in Bi + Bi collisions at the nuclotron-based ion collider facility and angular dependence of hyperon spin polarization Author info Nikita S. Tsegelnik ... [et al.] Author Tsegelnik Nikita S. (33%)
Co-authors Voronyuk Vadym (33%)
Kolomeitsev Evgeni E. 1970- (34%) UMBFP06 - Katedra fyziky
Source document Particles. Vol. 7, no. 4 (2024), pp. 984-1003. - Basel : Multidisciplinary Digital Publishing Institute, 2024 Keywords zrážky ťažkých iónov hydrodynamika polarizácia - polarization Form. Descr. články - journal articles Language English Country Switzerland Annotation The strange baryon production in Bi + Bi collisions at 𝑠𝑁𝑁−−−√=9.0 GeV is studied using the PHSD transport model. Hyperon and anti-hyperon yields, transverse momentum spectra, and rapidity spectra are calculated, and their centrality dependence and the effect of rapidity and transverse momentum cuts are studied. The rapidity distributions for Λ, Ξ, Ξ baryons are found to be systematically narrower than for Λs. The 𝑝𝑇 slope parameters for anti-hyperons vary more with centrality than those for hyperons. Restricting the accepted rapidity range to |𝑦|<1 increases the slope parameters by 13–30 MeV, depending on the centrality class and the hyperon mass. Hydrodynamic velocity and vorticity fields are calculated, and the formation of two oppositely rotating vortex rings moving in opposite directions along the collision axis is found. The hyperon spin polarization induced by the medium vorticity within the thermodynamic approach is calculated, and the dependence of the polarization on the transverse momentum and rapidity cuts and on the centrality selection is analyzed. The cuts have stronger effect on the polarization of Λ and Ξ hyperons than on the corresponding anti-hyperons. The polarization signal is maximal for the centrality class, 60–70%. We show that, for the considered hyperon polarization mechanism, the structure of the vorticity field makes an imprint on the polarization signal as a function of the azimuthal angle in the transverse momentum plane, 𝜙𝐻, cos𝜙𝐻=𝑝𝑥/𝑝𝑇. For particles with positive longitudinal momentum, 𝑝𝑧>0, the polarization increases with cos𝜙𝐻, while for particles with 𝑝𝑧<0 it decreases. URL Link na plný text Public work category ADM No. of Archival Copy 55132 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika 
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