# Measurement of jet-substructure observables in top quark, $W$ boson and light jet production in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

## TL;DR

This paper presents measurements of jet substructure variables in proton-proton collisions at 13 TeV using the ATLAS detector, focusing on jets from light quarks, gluons, top quarks, and W bosons, to improve tagging techniques.

## Contribution

It provides detailed measurements of jet substructure observables for different jet types and compares them to Monte Carlo predictions, enhancing understanding of jet tagging in high-energy physics.

## Key findings

- Distributions of substructure variables are measured and corrected for detector effects.
- Comparisons show how well Monte Carlo models reproduce jet substructure.
- Differences between light-quark/gluon jets and boosted top/W jets are characterized.

## Abstract

A measurement of jet substructure variables is presented using data collected in 2016 by the ATLAS experiment at the LHC with proton-proton collisions at $\sqrt{s}=13$ TeV. Large-radius jets groomed with the trimming and soft-drop algorithms are studied. Dedicated event selections are used to study jets produced by light quarks or gluons, and hadronically decaying top quarks and $W$ bosons. The variables measured are sensitive to pronged substructure, and therefore are typically used for tagging jets from boosted massive particles. These include the energy correlation functions and the $N$-subjettiness variables. The number of subjets and the Les Houches angularity are also considered. The distributions of the substructure variables, corrected for detector effects, are compared to the predictions of various Monte Carlo event generators. They are also compared between the large-radius jets originating from light quarks or gluons, and hadronically decaying top quarks and $W$ bosons.