Lambda polarization in low-energy heavy-ion collisions depends on the equation of state in UrQMD simulations and arises from shear in the baryon current due to stopping.
Measurement of transverse polarization of $\Lambda$ and $\bar{\Lambda}$ hyperons inside jets in $pp$ collisions at $\sqrt{s}=200$ GeV
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abstract
A surprisingly large transverse polarization of $\Lambda$ hyperons in unpolarized hadron-nucleon/nucleus collisions has been observed for 50 years, and the origin of this polarization remains an important open question. Recently, theoretical frameworks have advanced in describing this puzzle with the polarizing fragmentation function (PFF). We report the first measurement of $\Lambda$ and $\overline{\Lambda}$ transverse polarization inside jets in unpolarized proton-proton collisions, which is directly attributed to the PFF. The polarization is measured as a function of the jet transverse momentum, the fraction of the jet momentum carried by $\Lambda$($\overline{\Lambda}$) hyperons, and the transverse momentum of $\Lambda(\overline{\Lambda})$ hyperons relative to the jet axis. Covering a wide jet-energy range, these data provide the first constraints on the gluon PFF and allow tests of TMD evolution and its universality.
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2026 2verdicts
UNVERDICTED 2representative citing papers
Second-order relativistic viscous hydrodynamics including thermal vorticity and evolving magnetic fields yields global Lambda hyperon polarization in Pb+Pb collisions at 2.76 and 5.02 TeV that qualitatively matches ALICE measurements.
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Hadron polarization and equation of state at FAIR/RHIC-BES energies
Lambda polarization in low-energy heavy-ion collisions depends on the equation of state in UrQMD simulations and arises from shear in the baryon current due to stopping.
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Global polarization of $\Lambda$ hyperons in hot QCD matter at TeV energies
Second-order relativistic viscous hydrodynamics including thermal vorticity and evolving magnetic fields yields global Lambda hyperon polarization in Pb+Pb collisions at 2.76 and 5.02 TeV that qualitatively matches ALICE measurements.