Two particle correlation measurements at PHENIX

TL;DR

This paper reports on measurements of two-particle azimuthal correlations in heavy ion collisions, providing insights into parton energy loss and medium effects, with methods to isolate flow contributions.

Contribution

It presents new correlation measurements with event plane dependence and flow subtraction, enhancing understanding of parton-medium interactions in heavy ion collisions.

Findings

Correlation patterns depend on event plane orientation.

Flow subtraction clarifies jet-medium interaction signals.

Results support models of path-length dependent energy loss.

Abstract

Measurements of two particle azimuthal correlations in relativistic heavy ion collisions are useful tools to dissect the interplay between hard-scattered partons and hot dense medium. Correlations with trigger particle selection relative to second order event plane are sensitive to the path-length dependence of parton energy loss and to the influence of the medium on jet for high and intermediate transverse momenta pairs, respectively. To study the parton-medium coupling, it is also crucial to obtain correlations with rejection of contributions from higher harmonic flow. We present current results of second order event plane dependent correlations as well as correlations in which contributions from higher harmonic flow have been excluded in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV measured by PHENIX.