# Mixed Harmonic Correlations: Hydrodynamics Predictions at RHIC using Experimental Analysis Techniques

## TL;DR

This paper predicts mixed harmonic correlations in heavy-ion collisions at RHIC using hydrodynamics, offering new insights into initial state fluctuations and guiding experimental analysis techniques.

## Contribution

It introduces hydrodynamic predictions for mixed harmonic correlations at RHIC, emphasizing proper comparison methods with experimental data.

## Key findings

- Predicted mixed harmonic correlations for 200 A GeV Au+Au collisions.
- Provided a baseline for experimental comparison of flow harmonic correlations.
- Highlighted methods for accurate theoretical-experimental comparison.

## Abstract

Correlations of different azimuthal flow harmonics $v_n$ and symmetry planes $\Psi_n$ can add constraints to theoretical models, and probe aspects of the system that are independent of the traditional single-harmonic measurements. Using NeXSPheRIO, a hydrodynamical model which has accurately reproduced a large set of single-harmonic correlations at RHIC, we make predictions of these new observables for 200 A GeV Au+Au Collisions, providing an important baseline for comparison to correlations of flow harmonics, which contain non-trivial information about the initial state. We also point out how to properly compare theoretical calculations to measurements using wide centrality bins and non-trivial event weighting.