# QM 2022

Apr 4 – 10, 2022
Auditorium Maximum UJ
Europe/Warsaw timezone
Proceedings submission deadline extended to August 15, 2022

## Jet-medium excitations induced Λ polarization as a gradient tomographic probe in heavy-ion collisions.

Apr 6, 2022, 7:18 PM
4m
Poster Chirality, vorticity and spin polarization

### Speaker

Willian Matioli Serenone (Universidade de São Paulo)

### Description

Recent measurements on $\Lambda$ hyperon's polarization suggest a strong correlation with the local fluid vorticity in hydrodynamic models. Jet-medium interactions induce a generic vortex ring structure of the fluid kinematic vorticity along the quenched jet axis. In this talk, we propose a novel ring observable R^J to capture such a ring excitation in the fluid's flow field by high-energy partons [1]. This observable $\mathcal{R}^{\hat{J}}$ shows a strong sensitivity to the fluid's shear viscosity. We verify our results with event-by-event hydrodynamic backgrounds. Furthermore, we expand our (3+1)D calculations by systematically studying the $\mathcal{R}^{\hat{J}}$'s dependence on the temporal-spatial size and magnitude of the deposited energy-momentum current. Finally, we quantify how the angular distribution of $\mathcal{R}^{\hat{J}}$ is correlated with the background flow field and can serve as a tomographic probe for the flow gradient field.

[1] W. M. Serenone, J. G. P. Barbon, D. D. Chinellato, M. A. Lisa, C. Shen, J. Takahashi, and G. Torrieri, "Lambda polarization from thermalized jet energy,'' Phys. Lett. B820, 136500 (2021)

### Primary authors

David Dobrigkeit Chinellato (University of Campinas UNICAMP (BR)) Michael Lisa (The Ohio State University) Vitor Hugo Ribeiro (University of Campinas UNICAMP (BR)) Chun Shen (Wayne State University) Jun Takahashi (University of Campinas UNICAMP (BR)) Giorgio Torrieri (University of Campinas UNICAMP (BR))