Investigations on mixed harmonic cumulants in heavy-ion collisions at the LHC

TL;DR

This paper introduces new mixed harmonic multi-particle cumulants to quantify flow coefficient correlations in heavy-ion collisions, enhancing understanding of quark-gluon plasma properties with hydrodynamic models.

Contribution

It systematically investigates correlations among multiple flow coefficients and moments using hydrodynamic models, providing novel observables less sensitive to non-flow effects.

Findings

New mixed harmonic cumulants quantify flow correlations.

Hydrodynamic models predict significant flow coefficient correlations.

Results will help constrain quark-gluon plasma properties.

Abstract

A series of new flow observables mixed harmonic multi-particle cumulants (MHC), which allow for the first time to quantify the correlations strength between different order of flow coefficients with various moments, was investigated using hydrodynamic model. These new observables are constructed based on multi-particle cumulants, and thus by design will be less sensitive to the non-flow contaminations. In addition to the previous study of correlation involving two flow coefficients with their second moments, both correlations of three flow coefficients and the correlations of higher order moments of $v_2$ and $v_3$ are systematically investigated using iEBE-VISHNU hybrid model with two different initial conditions, AMPT and TRENTo, respectively. These systematic studies using hydrodynamic models will significantly improve the understanding on the correlations between different orders (and moments) of flow coefficients. The hydrodynamic predictions shown in this paper and the future comparisons to experimental measurements will provide more constraints on theoretical models and extract more information about the transport properties of the quark-gluon plasma created in heavy-ion collisions.