2025/04/16 by Yu. B. Ivanov, Ivanov, Yu. B. · 1 citation
Physics and Astronomy · #Dust and Plasma Wave Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Magnetic confinement fusion research #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th)
paper · doi:10.48550/arxiv.2504.12200
openalex publication_date 2025/04/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Based on the model of three-fluid dynamics (3FD), the global Λ polarization (PΛ) is calculated in Au+Au collisions at 3 ≤√sNN≤ 9 GeV, in which high baryon density is achieved. Various contributions to PΛ are considered: those from the thermal vorticity, meson field, thermal shear and spin-Hall effect. Feed-down from higher-lying resonances is also taken into account. The results are compared with available data. Special attention is payed to the collision energies of √sNN= 3, 3.2, 3.5, 3.9, and 4.5 GeV, for which a thorough scan of the energy, rapidity, and centrality dependence of PΛ is performed. The results for 3 GeV reasonably well reproduce the corresponding STAR data. While the results at √sNN= 3.2, 3.5, 3.9, and 4.5 GeV can be considered as predictions for results of measurements within the STAR fixed-target (STAR-FXT) programthat are expected in the nearest future. It is predicted that a broad maximum of PΛ is reached at √sNN≈ 3--3.9 GeV, exact position of which depends on the centrality and width of the midrapidity range of observation. Impact of the meson-field, thermal-shear and spin-Hall-effect contributions to PΛ is also studied.