Measurement of event shape variables using charged particles inside jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV

TL;DR

This paper measures five event shape variables using charged particles inside jets in proton-proton collisions at 13 TeV, comparing results with theoretical models to test quantum chromodynamics predictions.

Contribution

It presents the first measurement of these event shape variables using charged particles inside jets at 13 TeV, providing data to validate multijet production models.

Findings

General agreement between data and several theoretical models

Distributions of event shape variables are well described by predictions

Results help refine understanding of quantum chromodynamics in multijet events

Abstract

Event shape variables, constructed from the four-momenta of the final-state objects in an event, are sensitive to the predictions of quantum chromodynamics in multijet production. A measurement of five event shape variables is presented, using proton-proton collision data collected at a centre-of-mass energy of 13 TeV with the CMS detector during 2016$-$2018, corresponding to an integrated luminosity of 138 fb$^{-1}$. The variables are evaluated using the charged particles inside jets. After correcting for detector effects, their distributions are compared with the results from the predictions from a number of models for multijet production. Overall, there is general agreement between several theoretical predictions and the data.