Çetin, Serkant Ali2020-06-252020-06-252018-07-091434-60521434-6044https://hdl.handle.net/11411/2281https://doi.org/10.1140/epjc/s10052-018-5995-6A search for new heavy particles that decay into top-quark pairs is performed using data collected from proton-proton 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. Jets identified as likely to contain b-hadrons are required to reduce the background from other Standard Model processes. The invariant mass spectrum of the candidate top-quark pairs is examined for local excesses above the background expectation. No significant deviations from the Standard Model predictions are found. Exclusion limits are set on the production cross-section times branching ratio for hypothetical Z' bosons, Kaluza-Kein gluons and Kaluza-Klein gravitons that decay into top-quark pairs.eninfo:eu-repo/semantics/openAccessPARTON DISTRIBUTIONSCROSS-SECTIONALGORITHMPHYSICSLHCArticle2-s2.0-8504960509710.1140/epjc/s10052-018-5995-630395135Q1WOS:000438114500005