Estimates of hyperon polarization in heavy-ion collisions at collision energies $\sqrt{s_{NN}}=$ 4--40 GeV

Abstract

Global polarization of $\Lambda$ and $\bar{\Lambda }$ hyperons in Au+Au collisions at collision energies $\sqrt{s_{NN}}=$ 4-40 GeV in the midrapidity region and total polarization, i.e. averaged over all rapidities, are studied within the scope of the thermodynamical approach. The relevant vorticity is simulated within the model of the three-fluid dynamics (3FD). It is found that the performed rough estimate of the global midrapidity polarization quite satisfactorily reproduces the experimental STAR data on the polarization, especially its collision-energy dependence. The total polarization increases with the collision energy rise, which is in contrast to the decrease of the midrapidity polarization. This suggests that at high collision energies the polarization reaches high values in fragmentation regions.

arXiv comment8 pages, 4 figures, minor editing of the text, Fig. 4 changed, version to be published in Phys.Rev.C

References in corpus (42)

• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Global $\Lambda$ hyperon polarization in nuclear collisions: evidence for the most vortical fluid
• Bulk Properties of the Medium Produced in Relativistic Heavy-Ion Collisions from the Beam Energy Scan Program
• Globally Polarized Quark-gluon Plasma in Non-central A+A Collisions
• Relativistic distribution function for particles with spin at local thermodynamical equilibrium
• Global hyperon polarization at local thermodynamic equilibrium with vorticity, magnetic field and feed-down
• Chiral anomaly and local polarization effect from quantum kinetic approach
• Rotating quark-gluon plasma in relativistic heavy ion collisions
• Study of Lambda polarization in relativistic nuclear collisions at sqrt{s}_NN = 7.7-200 GeV
• Polarization probes of vorticity in heavy ion collisions
• Global $\Lambda$ polarization in heavy-ion collisions from a transport model
• Global quark polarization in non-central $A+A$ collisions
• Polarization of massive fermions in a vortical fluid
• Thermal vorticity and spin polarization in heavy-ion collisions
• Relativistic Heavy-Ion Collisions within 3-Fluid Hydrodynamics: Hadronic Scenario
• Global $\Lambda$ Polarization in high energy collisions
• Lambda hyperon polarization in relativistic heavy ion collisions from the chiral kinetic approach
• Dynamical phase trajectories for relativistic nuclear collisions
• Chiral vortaic effect and neutron asymmetries at NICA
• Examination of the directed flow puzzle in heavy-ion collisions
• Lattice QCD Constraints on the Nuclear Equation of State
• Directed Flow Indicates a Crossover Deconfinement Transition in Relativistic Nuclear Collisions
• Hyperon polarization in Heavy-Ion Collisions and gravity-related anomaly
• $\Lambda$ and $\bar{\Lambda }$ spin interaction with meson fields generated by the baryon current in high energy nuclear collisions
• Alternative Scenarios of Relativistic Heavy-Ion Collisions: I. Baryon Stopping
• Axial anomaly and energy dependence of hyperon polarization in Heavy-Ion Collisions
• Dynamical Freeze-out in 3-Fluid Hydrodynamics
• Vorticity and hyperon polarization at NICA energies
• Vorticity in heavy-ion collisions at the JINR Nuclotron-based Ion Collider fAcility
• Alternative Scenarios of Relativistic Heavy-Ion Collisions: II. Particle Production
• Baryon Stopping as a Probe of Deconfinement Onset in Relativistic Heavy-Ion Collisions
• Alternative Scenarios of Relativistic Heavy-Ion Collisions: III. Transverse Momentum Spectra
• Elliptic Flow in Heavy-Ion Collisions at Energies $\sqrt{s_{NN}}=$ 2.7--39 GeV
• Robustness of the Baryon-Stopping Signal for the Onset of Deconfinement in Relativistic Heavy-Ion Collisions
• On freeze-out problem in relativistic hydrodynamics
• Vortex rings in fragmentation regions in heavy-ion collisions at $\sqrt{s_{NN}}=$ 39 GeV
• What can we learn from the directed flow in heavy-ion collisions at BES RHIC energies?
• Elliptic Flow of Protons and Antiprotons in Au+Au Collisions at $\sqrt{s_{NN}}$ = 7.7--62.4 GeV within Alternative Scenarios of Three-Fluid Dynamics
• Entropy Production and Effective Viscosity in Heavy-Ion Collisions
• Bulk Properties of the Matter Produced at Energies of the Beam Energy Scan Program
• High baryon and energy densities achievable in heavy-ion collisions at $\sqrt{s_{NN}}=$ 39 GeV
• Estimates of the baryon densities attainable in heavy-ion collisions from the beam energy scan program

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• Vorticity and Particle Polarization in Relativistic Heavy-Ion Collisions
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• Rise and fall of $\Lambda$ and $\bar{\Lambda }$ global polarization in semi-central heavy-ion collisions at HADES, NICA and RHIC energies from the core-corona model
• Impact of vorticity and viscosity on the hydrodynamic evolution of hot QCD medium
• Hyperon polarization and its relation with directed flow in high-energy nuclear collisions
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• Estimating Longitudinal Polarization of $\Lambda$ and $\bar{\Lambda }$ Hyperons at Relativistic Energies using Hydrodynamic and Transport models
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• Polarization in heavy ion collisions: a theoretical review
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