Two-component source to explain $\Lambda$ and $\bar{\Lambda }$ global polarization in non-central heavy-ion collisions

Abstract

The STAR Beam Energy Scan program has found a difference in the global polarization of $\Lambda$s and $\bar{\Lambda }$s produced in $Au+Au$ collisions. This difference is larger for lower center of mass collision energies. In this work we show that a two-component source, consisting of a high density core and a lower density corona, can describe quantitatively the $\Lambda$ and $\bar{\Lambda }$ polarization as a function of collision energy.

arXiv comment8 pages, 7 figures

References in corpus (27)

• Global $\Lambda$ hyperon polarization in nuclear collisions: evidence for the most vortical fluid
• Angular momentum conservation in heavy ion collisions at very high energy
• Global polarization of $\Lambda$ hyperons in Au+Au collisions at $\sqrt{s_{{}_{NN}}}$ = 200 GeV
• Global hyperon polarization at local thermodynamic equilibrium with vorticity, magnetic field and feed-down
• Study of Lambda polarization in relativistic nuclear collisions at sqrt{s}_NN = 7.7-200 GeV
• QCD Analysis of Unpolarized and Polarized Lambda - Baryon Production in Leading and Next-to-Leading Order
• Lambda Polarization in Peripheral Heavy Ion Collisions
• Probing vorticity structure in heavy-ion collisions by local $\Lambda$ polarization
• J/Psi Suppression in Pb-Pb Collisions: A Hint of Quark-Gluon Plasma Production?
• Optimal conditions for exploring high-density baryonic matter
• Polarized Lambdas in the Current Fragmentation Region
• Lambda polarization from unpolarized quark fragmentation
• Polarized Lambda-Baryon Production in pp Collisions
• Spin content of Lambda and its longitudinal polarization in $e^{+}{e}^{-}$ annihilation at high energies
• Lambda and Lambda-bar Polarization in Lepton Induced Processes
• The Proton Spin Puzzle and $\Lambda$ Polarization in Deep--Inelastic Scattering
• $\Lambda$ polarization in peripheral collisions at moderate relativistic energies
• $\Lambda$, $\bar{\Lambda }$ Polarization and Spin Transfer in Lepton Deep-Inelastic Scattering
• Investigating different $\Lambda$ and $\bar{\Lambda }$ polarizations in relativistic heavy-ion collisions
• Core meets corona: a two-component source to explain Lambda and anti-Lambda global polarization in semi-central heavy-ion collisions
• Lambda^0 polarization as a probe for production of deconfined matter in ultra-relativistic heavy-ion collisions
• Longitudinal Polarization of Lambda and anti-Lambda Hyperons in Lepton-Nucleon Deep-Inelastic Scattering
• Lambda and Lambda-bar polarization in polarized DIS
• Lambda and Antilambda polarization in Au-Au collisions at RHIC
• Vorticity in the QGP liquid and $\Lambda$ polarization at the RHIC Beam Energy Scan
• Polarization of Lambda^0 hyperons in nucleus-nucleus collisions at high energies
• Transverse ${\Lambda }^0$ polarization in inclusive quasi-real photoproduction at the current fragmentation