Quark jet rates and quark/gluon discrimination in multi-jet final states

TL;DR

This paper develops a semi-analytical method to estimate quark jet rates in multi-jet events at hadron colliders, proposing a new variable for quark/gluon discrimination to improve signal detection.

Contribution

It introduces a novel calculation of quark jet rates and a data-driven variable for better quark/gluon discrimination in multi-jet analyses.

Findings

Improved signal-to-background ratio estimates using the new variable.

Semi-analytical calculations align with Monte Carlo results.

Proposed method reduces systematic uncertainties in jet flavor analysis.

Abstract

We estimate the number of quark jets in QCD multi-jet final states at hadron colliders. In the estimation, we develop the calculation of jet rates into that of quark jet rates. From the calculation, we estimate the improvement on the signal-to-background ratio for a signal semi-analytically by applying quark/gluon discrimination, where the signal predicts many quark jets. We introduce a variable related to jet flavors in multi-jet final states and propose a data-driven method using the variable to reduce systematic uncertainties of analysis results. As the same with the semi-analytical result, the improvements on the signal-to-background ratio using the variable in Monte-Carlo analysis are estimated.