Higher-order anisotropic flow correlations in Xe-Xe collisions at $\mathrm{\sqrt{s_{NN}}= 5.44 TeV}$

TL;DR

This study uses the HYDJET++ model to analyze higher-order anisotropic flow coefficients in Xe-Xe collisions at 5.44 TeV, revealing their strong centrality dependence and correlation with lower-order flows, and compares results with LHC data.

Contribution

It introduces a detailed analysis of higher-order flow harmonics in Xe-Xe collisions using a combined model and a power-law scaling technique, enhancing understanding of nonlinear hydrodynamic responses.

Findings

Higher-order flow coefficients show strong centrality dependence.

Significant correlation between higher-order and lower-order flow coefficients.

Results align with recent LHC experimental data.

Abstract

By employing the Monte Carlo HYDJET++ model (HYDrodynamics plus JETs), we produce anisotropic harmonic flow coefficients $v_n$ ($n = 4$-$7$) in deformed Xe-Xe collisions at $\sqrt{s_{NN}} = 5.44~\mathrm{TeV}$. These harmonics are measured with respect to a plane constructed using the lower-order Fourier harmonics $v_2$ and $v_3$, produced using the reaction plane method. The cross-talk between elliptic and triangular flows in the model generates both even and odd higher-order harmonics. By combining analyses of higher harmonics with those of $v_2$ and $v_3$, one can eliminate uncertainties in modeling anisotropic flow from initial conditions and define quantities that involve only nonlinear hydrodynamic response coefficients. In this context, we study the individual response of higher-order flow coefficients to the lower-order ones through a power-law scaling technique of the form $v_n / v_m^m$, as a function of collision centrality. We report that the higher-order flow coefficients $v_n$ ($n = 4$-$7$) exhibit strong centrality dependence and are significantly correlated with the elliptic and triangular flow. The results are compared with data from recent ALICE, ATLAS, and CMS experiments at the LHC.