Fractal based observables to probe jet substructure of quarks and gluons

Abstract

New jet observables are defined which characterize both fractal and scale-dependent contributions to the distribution of hadrons in a jet. These infrared safe observables, named Extended Fractal Observables (EFOs), have been applied to quark-gluon discrimination to demonstrate their potential utility. The EFOs are found to be individually discriminating and only weakly correlated to variables used in existing discriminators. Consequently, their inclusion improves discriminator performance, as here demonstrated with particle level simulation from the parton shower.

[v1] 11 pages 4 figures [v2] 13 pages, 5 figures [v3] 9 pages, 7 figures. v2 added comment on how the observable can preserve infrared safety, updated acknowledgement, added diagram about visualization. v3 added comparison of performance in Herwig and Pythia, added comparison between two different EFO fitting functions, and added figure showing dependence on transverse momentum

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Cited by in corpus (11)

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• A Theory of Quark vs. Gluon Discrimination
• Equivariant Energy Flow Networks for Jet Tagging
• The Entropy of a Jet
• Jet Substructure from Dark Sector Showers
• Pure Quark and Gluon Observables in Collinear Drop
• Quark jet rates and quark/gluon discrimination in multi-jet final states
• Applications of Persistent Homology in Nuclear Collisions
• Riemannian Data preprocessing in Machine Learning to focus on QCD color structure
• Experimental Verification of Two types of Gluon Jets in QCD