Measurements of top-quark pair differential cross-sections in the lepton+jets channel in $pp$ collisions at $\sqrt{s}$=13 TeV using the ATLAS detector

TL;DR

This paper presents measurements of top-quark pair differential cross-sections in proton-proton collisions at 13 TeV, using the ATLAS detector, focusing on resolved and boosted topologies with detailed comparisons to Monte Carlo simulations.

Contribution

First measurement of top-quark pair differential cross-sections in both resolved and boosted topologies at 13 TeV with the ATLAS detector.

Findings

Measured spectra are corrected for detector effects.

Data are compared to Monte Carlo simulations using $$ and p-values.

Abstract

Measurements of differential cross-sections of top-quark pair production in fiducial phase-spaces are presented as a function of top-quark and $t\bar{t}$ system kinematic observables in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$=13 TeV. The data set corresponds to an integrated luminosity of $3.2$ fb${}^{-1}$, recorded in 2015 with the ATLAS detector at the CERN Large Hadron Collider. Events with exactly one electron or muon and at least two jets in the final state are used for the measurement. Two separate selections are applied that each focus on different top-quark momentum regions, referred to as resolved and boosted topologies of the $t\bar{t}$ final state. The measured spectra are corrected for detector effects and are compared to several Monte Carlo simulations by means of calculated $\chi^2$ and $p$-values.