Particle Correlations in Jets

TL;DR

This paper investigates particle correlations in high energy jets using energy-energy correlators to distinguish genuine correlations from medium effects, aiding understanding of parton splitting and medium modifications in QCD.

Contribution

It introduces a method comparing measured and constructed energy-energy correlators to identify genuine correlations in jets, useful for studying medium effects in heavy ion collisions.

Findings

Genuine correlations exist at small and large angles in jet EEC.

The method can differentiate medium modifications from medium responses.

It provides a new tool for studying parton splitting in hot QCD medium.

Abstract

We study particle correlations in high energy jets by comparing the measured energy-energy correlator (EEC) with that constructed from two individual energy flows with respect to the jet axis. This comparison demonstrates that genuine correlations exists for small angle and moderate/large angle, indicating that they are coming from correlated splitting. This method will provide a unique tool to disentangle different physics, by comparing the genuine correlations in jet EEC between heavy ion collisions and proton-proton collisions. It will help to expose the medium modification of parton splitting in hot QCD medium. On the other hand, the medium responses are expected to be canceled out in the genuine correlations.