Distinguishing b-quark and gluon jets with a tagged b-hadron

TL;DR

This paper presents a method to distinguish b-quark jets from gluon jets by combining sensitive observables related to b-hadron content and radiation patterns, improving discrimination performance.

Contribution

It introduces a novel combination of observables to enhance jet flavor discrimination based on QCD radiation patterns and b-hadron tagging.

Findings

Improved efficiency in jet classification across momentum ranges.

Enhanced robustness of observables in different kinematic slices.

Demonstrated effectiveness of combined discriminators on particle-level data.

Abstract

Based on the knowledge of the QCD radiation pattern, observables to distinguish jets containing one and two $b$-hadrons are discussed. A simple method is used to combine pairs of the most sensitive observables, girth, number of charged tracks and the energy or momentum fraction of the leading $b$-hadron with respect to the jet, into one discriminator. Their efficiencies, on particle level, are estimated and found to improve the performance and the robustness of the observables in different momentum slices.