Vorticity in the QGP liquid and $\Lambda$ polarization at the RHIC Beam Energy Scan

Abstract

Polarization of $\Lambda$ hyperons and their antiparticles is calculated in a 3+1 dimensional viscous hydrodynamic model with initial state from UrQMD hadron/string cascade. We find that, along with recent results from STAR, the mean polarization at fixed centrality decreases as a function of collision energy from 1.5% at $\sqrt{s_{\mathrm{NN}}}=7.7$ GeV to 0.2% at $\sqrt{s_{\mathrm{NN}}}=200$ GeV. We explore the effects which lead to such collision energy dependence, feed-down corrections and a difference between $\Lambda$ and $\bar{\Lambda }$.

contribution to proceedings of Quark Matter 2017, 5-11 February 2017, Chicago (IL)

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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
• Vorticity and $\Lambda$ polarization in the microscopic transport model PACIAE
• Global angular momentum generation in heavy-ion reactions within a hadronic transport approach
• Impact of strong magnetic field, baryon chemical potential, and medium anisotropy on polarization and spin alignment of hadrons
• Estimating Longitudinal Polarization of $\Lambda$ and $\bar{\Lambda }$ Hyperons at Relativistic Energies using Hydrodynamic and Transport models
• Jet Quenching in The Most Vortical Fluid: A Holographic Approach
• Two-component source to explain $\Lambda$ and $\bar{\Lambda }$ global polarization in non-central heavy-ion collisions
• Non-perturbative suppression of Chiral Effects in hot QGP for $\Lambda /\bar{\Lambda }$-hyperons spin polarization in heavy-ion collisions