QM 2022

Global polarization of \Lambda hyperons in Au+Au \sqrt{s_{NN}} = 7.2 GeV collisions with fi xed-target mode at RHIC-STAR experiment

6 Apr 2022, 18:50

4m

Poster Chirality, vorticity and spin polarization Poster Session 2 T02

Speaker

Kosuke Okubo

Description

Non-central heavy-ion collisions produce a large angular momentum that leads to vorticity of the created system.Due to the spin-orbit coupling, spin directions of particles are aligned with the orbital angular momentum of the system. Global polarization of $\mathrm{\Lambda }$ and $\bar{\mathrm{\Lambda }}$ hyperons has been measured in Au+Au collisions from $\sqrt{{\mathrm{s}}_{\mathrm{N}\mathrm{N}}}$ = 7.7 GeV to 5.02 TeV [1-3]. The STAR fixed target program provides an opportunity to extend such measurements at even lower energies.In this poster, differential measurements such as centrality, rapidity, and transverse momentum dependence of global polarization of $\mathrm{\Lambda }$ hyperons in Au+Au collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}$ = 7.2 GeV with the fixed-target configuration are reported.

L.Adamczyk et al,(STAR) Nature 548 62 (2017).
J.Adam et al.(STAR), Phys. Rev. C 98 14910 (2018)
S.Acharya et al.(ALICE), Phys. Rev. C 101, 044611 (2020)

Presentation materials

QMposter_KosukeOkubo_ver7.pdf