# Correlations between azimuthal anisotropy Fourier harmonics in PbPb collisions at $\sqrt{s_{_{\mathrm{NN}}}}=2.76$ TeV in the HYDJET++ and AMPT models

## TL;DR

This study compares the correlations of azimuthal anisotropy Fourier harmonics in PbPb collisions at 2.76 TeV using HYDJET++ and AMPT models, showing that AMPT aligns better with experimental data than HYDJET++ in several aspects.

## Contribution

The paper evaluates and compares the performance of HYDJET++ and AMPT models in reproducing azimuthal harmonic correlations observed in PbPb collisions at LHC energies.

## Key findings

- AMPT model agrees well with experimental data on harmonic correlations.
- HYDJET++ predicts stronger correlations than observed experimentally.
- AMPT reproduces the boomerang-like correlation structure seen in data.

## Abstract

Correlations between azimuthal anisotropy Fourier harmonics $v_{n}$ ($n = 2, 3, 4$) are studied using the events from PbPb collisions at $\sqrt{s_{_{\mathrm{NN}}}}=2.76$ TeV generated by the HYDJET++ and AMPT models, and compared to the corresponding experimental results obtained by the ATLAS Collaboration. The Fourier harmonics $v_{n}$ are measured over a wide centrality range using the two-particle azimuthal correlation method. The slopes of the $v_{2}$--$v_{3}$ correlation from both models are in a good agreement with the ATLAS data. The HYDJET++ model predicts a stronger slope for the $v_{2}$--$v_{4}$ and $v_{3}$--$v_{4}$ correlations than the ones experimentally measured, while the results from the AMPT model are in a rather good agreement with the experimental results. In contrast to the HYDJET++ predictions, the AMPT model predicts a boomerang-like shape in the structure of the correlations as found in the experimental data.