# Jet-hadron correlations relative to the event plane at the LHC with ALICE

## TL;DR

This paper investigates how jets produced in heavy-ion collisions at the LHC are modified by the Quark Gluon Plasma, using azimuthal correlations relative to the event plane to understand medium effects.

## Contribution

It introduces a novel background subtraction method and analyzes jet modifications relative to the event plane in Pb--Pb collisions at the LHC.

## Key findings

- Jet correlations show dependence on the trigger's orientation to the event plane.
- The background subtraction method effectively isolates jet signals in heavy-ion environments.
- Results suggest path length dependence of jet quenching effects.

## Abstract

The hot, dense and strongly interacting medium known as the Quark Gluon Plasma (QGP) is produced in relativistic heavy-ion collisions at the Large Hadron Collider (LHC). Early in the collisions, quarks and gluons from the incoming nuclei collide to produce high momentum partons which fragment into collimated sprays of hadrons called "jets". In pp collisions, jet production is well understood within the framework of perturbative QCD and acts as a rigorous baseline measurement for jet quenching measurements. Using pp as a reference, we can compare to heavy-ion collision systems, and study the modification of the $p_{T}$ or angular distributions of jet fragments. A recently developed background subtraction method to remove the complex, flow dominated, heavy-ion background will be used in this analysis. Azimuthal angular correlations of charged hadrons with respect to the axis of a full (charged + neutral) reconstructed 'trigger' jet in Pb--Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV in ALICE will be presented here. The analysis of angular correlations for different orientations of the trigger relative to the event plane allows for the study of the path length dependence of medium modifications to jets. The status of studies of the event plane dependence of angular correlations will be presented.