A Short Review on Jet Identification

TL;DR

This review discusses modern jet reconstruction algorithms and background subtraction techniques used in heavy ion collisions at RHIC, highlighting recent experimental results on direct jet reconstruction in Au+Au collisions.

Contribution

It provides an overview of jet reconstruction methods and recent experimental findings, emphasizing techniques that mitigate geometric biases in heavy ion collision measurements.

Findings

Successful application of jet reconstruction algorithms in heavy ion environments

Recent STAR experiment results on direct jet measurements in Au+Au collisions

Techniques to reduce biases in jet quenching studies

Abstract

Jets can be used to probe the physical properties of the high energy density matter created in collisions at the Relativistic Heavy Ion Collider (RHIC). Measurements of strong suppression of inclusive hadron distributions and di-hadron correlations at high $p_{T}$ have already provided evidence for partonic energy loss. However, these measurements suffer from well-known geometric biases due to the competition of energy loss and fragmentation. These biases can be avoided if the jets are reconstructed independently of their fragmentation details - quenched or unquenched. In this paper, we discuss modern jet reconstruction algorithms (cone and sequential recombination) and their corresponding background subtraction techniques required by the high multiplicities of heavy ion collisions. We review recent results from the STAR experiment at RHIC on direct jet reconstruction in central Au+Au collisions at $\sqrt {s_{NN}}= 200$ GeV.