Precision measurements of jet production at the ATLAS experiment

TL;DR

This paper presents recent ATLAS measurements of jet production at 13 TeV, exploring multijet properties, the Lund Plane, strong coupling constant, and heavy-quark fragmentation, providing data to test QCD predictions.

Contribution

It offers new experimental data on jet properties, the Lund Plane, and heavy-quark fragmentation, enhancing understanding of QCD and parton shower models.

Findings

Measurements agree with several Monte Carlo models

Provides constraints on the strong coupling constant

Improves understanding of heavy-quark fragmentation functions

Abstract

Measurements of jet production are sensitive to the strong coupling constant, high order perturbative calculations and parton distribution functions. In this talk we present the most recent ATLAS measurements in this area at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV. We present measurements of variables probing the properties of the multijet energy flow and of the Lund Plane using charged particles. We will also present new measurements sensitive to the strong coupling constant. For jet fragmentation, we present a measurement of the fragmentation properties of $b$-quark initiated jets, studied using charged B mesons. This analysis provides key measurements with which to better understand the fragmentation functions of heavy quarks. All results are corrected for detector effects and compared to several Monte Carlo predictions with different parton shower and hadronisation models.