Search for New Resonances Decaying into Top-Quark Pairs Using Lepton-Plus-Jets Events in Proton-Proton Collisions at √s = 13 TeV with the ATLAS Detector

Abstract

A search for new resonances that decay into top-quark pairs is performed using data collected from protonproton collisions at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. The integrated luminosity of the data sample is 36.1 fb-1. Events consistent with top-quark pair production are selected by requiring a single isolated charged lepton, missing transverse momentum and jet activity compatible with a hadronic top-quark decay. The invariant mass spectrum of the candidate topquark pairs is examined for excesses above the background expectation. No significant deviations from the Standard Model predictions are found.