The effect of triangular flow on di-hadron azimuthal correlations in relativistic heavy ion collisions

TL;DR

This study uses the AMPT model to analyze how triangular flow influences di-hadron azimuthal correlations in relativistic heavy ion collisions, revealing flow-related modifications to correlation structures.

Contribution

It demonstrates the impact of triangular flow fluctuations on di-hadron correlation patterns and isolates flow effects to clarify jet-related signals.

Findings

Double-peak structure observed after flow background subtraction.

Triangular flow fluctuations suppress near-side peaks.

Away-side double peaks become single peaks after flow subtraction.

Abstract

Using the AMPT model for relativistic heavy ion collisions, we have studied the di-hadron azimuthal angular correlations triggered by emitted jets in Au+Au collisions at center of mass energy $\sqrt{s_{NN}}=200$ GeV and impact parameter $b=8$ fm. A double-peak structure for the associated particles at the away side of trigger particles is obtained after subtracting background correlations due to the elliptic flow. Both the near-side peak and the away-side double peaks in the azimuthal angular correlations are, however, significantly suppressed (enhanced) in events of small (large) triangular flow, which are present as a result of fluctuations in the initial collision geometry. After subtraction of background correlations due to the triangular flow, the away-side double peaks change into a single peak with broad shoulders on both sides. The away side of the di-hadron correlations becomes essentially a single peak after further subtraction of higher-order flows.