Vorticity and $\Lambda$ polarization in the microscopic transport model PACIAE

Abstract

We study the behavior of four types of vorticities in non-central Au+Au collisions at energies $\sqrt{S_{NN}}$ = 5--200 GeV using a microscopic transport model PACIAE. The results show that the vorticities decay faster at lower energy and smaller impact parameter. The non-monotonic dependence of the initial vorticities on the collision energies is reconfirmed and the turning point is 10-15 GeV for different vorticities. The global $\Lambda$ polarization at energies $\sqrt{S_{NN}}$ = 7.7--200 GeV is reproduced by introducing an energy density freeze-out criterion.

7 pages, 7 figures, to be published in Pyhysical Review C

References in corpus (14)

• PYTHIA 6.4 Physics and Manual
• Angular momentum conservation in heavy ion collisions at very high energy
• Effects of initial flow velocity fluctuation in event-by-event (3+1)D hydrodynamics
• Collective longitudinal polarization in relativistic heavy-ion collisions at very high energy
• Spin-thermal shear coupling in a relativistic fluid
• Global $\Lambda$ Polarization in high energy collisions
• Flow Vorticity in Peripheral High Energy Heavy Ion Collisions
• Evolution of transverse flow and effective temperatures in the parton phase from a multi-phase transport model
• Global polarization of $\Xi$ and $\Omega$ hyperons in Au+Au collisions at $\sqrt{s_{{}_{NN}}}$ = 200 GeV
• The ideal relativistic spinning gas: polarization and spectra
• Different space-time freeze-out picture -- an explanation of different $\Lambda$ and $\bar{\Lambda }$ polarization?
• $\Lambda$ polarization in peripheral collisions at moderate relativistic energies
• Global $\Lambda$ polarization in moderately relativistic nuclear collisions
• Hyperon Polarization from the Vortical Fluid in Low Energy Nuclear Collisions

Cited by in corpus (4)

• Analytic solutions of relativistic dissipative spin hydrodynamics with radial expansion in Gubser flow
• Hydrodynamic helicity polarization in relativistic heavy ion collisions
• Global $\Lambda$ polarization in heavy-ion collisions at energies 2.4--7.7 GeV: Effect of Meson-Field Interaction
• Fluid Acceleration in Heavy-Ion Collisions