Anisotropic flow of identified particles in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV

TL;DR

This paper reports measurements of anisotropic flow coefficients for identified particles in Pb-Pb collisions at 5.02 TeV, providing insights into the quark-gluon plasma's properties and initial conditions through comparison with hydrodynamic models.

Contribution

It presents the first detailed measurements of flow coefficients for multiple particle species at 5.02 TeV and compares them with hydrodynamic models to constrain medium properties.

Findings

Flow coefficients vary with particle type and collision centrality.

Hydrodynamic models can describe the measured flow within uncertainties.

Results help constrain the shear and bulk viscosity of the quark-gluon plasma.

Abstract

Anisotropic flow is sensitive to the shear $(\eta/s)$ and bulk ($\zeta/s$) viscosity of the quark-gluon plasma created in heavy-ion collisions, as well as the initial state of such collisions and hadronization mechanisms. In these proceedings, elliptic ($v_2$) and higher harmonic ($v_3, v_4$) flow coefficients of $\pi^{\pm}$, $K^{\pm}$, p$(\overline{\rm{p}})$ and the $\phi$-meson, are presented for Pb-Pb collisions at the highest-ever center-of-mass energy of $\sqrt{s_{\rm NN}}$ = 5.02 TeV. Comparisons to hydrodynamic calculations (IP-Glasma, MUSIC, UrQMD) are shown to constrain the initial conditions and viscosity of the medium.