Measurements of differential cross sections of top quark pair production in association with jets in ${pp}$ collisions at $\sqrt{s}=13$ TeV using the ATLAS detector

TL;DR

This paper presents detailed measurements of how often top quark pairs are produced with jets at the LHC, analyzing their momentum distributions to test and compare with theoretical predictions.

Contribution

First measurements of differential cross sections of top quark pair production with jets at 13 TeV using ATLAS data from 2015.

Findings

Measured cross sections as functions of top quark and system transverse momentum.

Comparison with theoretical predictions shows good agreement in some regions.

Provides data for refining top quark production models.

Abstract

Measurements of differential cross sections of top quark pair production in association with jets by the ATLAS experiment at the LHC are presented. The measurements are performed as functions of the top quark transverse momentum, the transverse momentum of the top quark-antitop quark system and the out-of-plane transverse momentum using data from $pp$ collisions at $\sqrt{s}=13$ TeV collected by the ATLAS detector at the LHC in 2015 and corresponding to an integrated luminosity of 3.2 fb$^{-1}$. The top quark pair events are selected in the lepton (electron or muon) + jets channel. The measured cross sections, which are compared to several predictions, allow a detailed study of top quark production.