Elliptic flow and the high $p_T$ ridge in Au+Au collisions

TL;DR

This paper investigates the correlation between high and low transverse momentum particles in 200 GeV Au+Au collisions, revealing a complex dependence of flow vector distributions on particle pair angles, using STAR detector data.

Contribution

It introduces a novel analysis of the relationship between intermediate and low $p_T$ particles, highlighting non-trivial flow vector shape dependencies in heavy-ion collisions.

Findings

Flow vector distribution shape depends on high $p_T$ pair angles.

Correlation between high and low $p_T$ particles affects elliptic flow analysis.

Results suggest complex interplay in particle correlations at RHIC energies.

Abstract

In this paper we look for a correlations between intermediate $p_T$ particle pairs and the $v_2$ of the remaining low $p_T$ particles. We find that the shape of the flow vector distribution, which is calculated from all low $p_T$ tracks, depends in a non-trivial way on the angular separation between the high $p_T$ particle pairs in the event. Our analysis is based on 200 GeV Au+Au collision measured with the STAR detector.