Measurements of top-quark pair single- and double-differential cross-sections in the all-hadronic channel in \(pp\) collisions at \(\sqrt{s}=13~\mbox{TeV}\) using the ATLAS detector

Abstract

Differential cross-sections are measured for top-quark pair production in the all-hadronic decay mode, using proton\(-\)proton collision events collected by the ATLAS experiment in which all six decay jets are separately resolved. Absolute and normalised single- and double-differential cross-sections are measured at particle and parton level as a function of various kinematic variables. Emphasis is placed on well-measured observables in fully reconstructed final states, as well as on the study of correlations between the top-quark pair system and additional jet radiation identified in the event. The study is performed using data from proton\(-\)proton collisions at \(\sqrt{s}=13~\mbox{TeV}\) collected by the ATLAS detector at CERN's Large Hadron Collider in 2015 and 2016, corresponding to an integrated luminosity of \(\mbox{36.1 fb}^{-1}\). The rapidities of the individual top quarks and of the top-quark pair are well modelled by several independent event generators. Significant mismodelling is observed in the transverse momenta of the leading three jet emissions, while the leading top-quark transverse momentum and top-quark pair transverse momentum are both found to be incompatible with several theoretical predictions.