Experimental treatment of Quark and Gluon Jets

TL;DR

This paper proposes a method to distinguish quark and gluon jets using energy-dependent cuts, calibrated with gamma-jet and multi-jet events, to improve experimental analysis in high-energy collisions.

Contribution

It introduces a novel set of jet-energy dependent cuts for quark and gluon jet discrimination, with a calibration approach using real data to reduce model dependence.

Findings

Effective jet-energy dependent cuts for quark/gluon separation

Calibration method using gamma-jet and multi-jet events

Reduced reliance on Monte-Carlo predictions

Abstract

The separate study of quark and gluon jets is vital for the interpretation of multiple variables behaviour observed in both high-energy hadron and heavy-ion collisions in the present and future experiments. We propose a set of jet-energy dependent cuts to be used to distinguish between quark and gluon jets experimentally based on a Monte-Carlo study of their properties. Further, we introduce the possibility to calibrate these cuts via gamma-jet and multi-jet events, which represent clean production channels for quark and gluon jets, respectively. The calibration can happen on real data and thus, reduces the dependence of the method performance on Monte-Carlo model predictions.