Event-plane dependent di-hadron correlations with harmonic $v_n$ subtraction in a hydrodynamic model

TL;DR

This study uses a hydrodynamic model to analyze di-hadron azimuthal correlations in Au+Au collisions at 200 GeV, focusing on event-plane dependence and harmonic subtraction to understand correlation structures.

Contribution

It introduces a hydrodynamic approach with harmonic $v_n$ subtraction to explain azimuthal correlations, challenging the mini-jet interpretation.

Findings

Hydrodynamic model reproduces main features of experimental correlations.

Triangular flow $v_3$ subtraction clarifies correlation structures.

Hydrodynamics can account for observed azimuthal correlation patterns.

Abstract

In this work, a hydrodynamic study of the di-hadron azimuthal correlations for the Au+Au collisions at 200 GeV is carried out. The correlations are evaluated using the ZYAM method for the centrality windows as well as the transverse momentum range in accordance with the existing data. Event-plane dependence of the correlation is obtained after the subtraction of contributions from the most dominant harmonic coefficients. In particular, the contribution from the triangular flow, $v_3$, is removed from the proper correlations following the procedure implemented by the STAR collaboration. The resultant structure observed in the correlations was sometimes attributed to the mini-jet dynamics, but the present calculations show that a pure hydrodynamic model gives a reasonable agreement with the main feature of the published data. A brief discussion on the physical content of the present findings is presented.