The 8th International Conference on Chirality, Vorticity and Magnetic Field in Quantum Matter

Global Hypertriton Polarization in Au+Au collisions at sNN=7.7−200 GeV (online)

24 juil. 2024, 12:00

30m

Amphitheater A11 (West University of Timisoara)

On-line talk Hyperons

Orateur

Dai-Neng Liu

Description

Particles of non-zero spin produced in non-central heavy-ion collisions are expected to be polarized along the direction perpendicular to the reaction plane due to spin-orbit coupling in the produced matter, and this has indeed been observed for many hyperons and vector mesons. Here, we show that the hypertriton (${}_{\mathrm{\Lambda }}^3$H), which is the lightest hypernucleus, is also polarized in these collisions. Using the coalescence model based on the kinetic freezeout baryons for light (hyper-)nuclei production, we find that the angular distribution of the decay product of polarized  ${}_{\mathrm{\Lambda }}^3$H is highly sensitive to the spin configuration of its wavefunction, providing a novel way to determine its spin structure. We also predict the beam energy dependence of ${}_{\mathrm{\Lambda }}^3$H  polarizations in heavy-ion collisions from a few to hundreds GeV based on a multi-phase transport model (AMPT) and coalescence model. We further discuss the comparation of the global polarization between hypertriton and hyperon with the energy dependence. These patterns of the global ${}_{\mathrm{\Lambda }}^3$H polarization are expected to be tested in future experiments.