Aad, G.Abbott, B.Abbott, D.C.Abed Abud, A.Abeling, K.Abhayasinghe, D.K.Abidi, S.H.AbouZeid, O.S.Abraham, N.L.Abramowicz, H.Abreu, H.Abulaiti, Y.2021-07-262021-07-262020-10Journal of High Energy PhysicsOpen AccessVolume 2020, Issue 101 October 2020 Article number 611029-8479http://repositorio.unab.cl/xmlui/handle/ria/19501Indexación: Scopus.This paper presents a search for new heavy particles decaying into a pair of top quarks using 139 fb−1 of proton-proton collision data recorded at a centre-of-mass energy of s = 13 TeV with the ATLAS detector at the Large Hadron Collider. The search is performed using events consistent with pair production of high-transverse-momentum top quarks and their subsequent decays into the fully hadronic final states. The analysis is optimized for resonances decaying into a "padding-size-4-x display--inline-block" style="background: var(--highlight-yellow); color: inherit;">tt¯ pair with mass above 1.4 TeV, exploiting a dedicated multivariate technique with jet substructure to identify hadronically decaying top quarks using large-radius jets and evaluating the background expectation from data. No significant deviation from the background prediction is observed. Limits are set on the production cross-section times branching fraction for the new Z′ boson in a topcolor-assisted-technicolor model. The Z′ boson masses below 3.9 and 4.7 TeV are excluded at 95% confidence level for the decay widths of 1% and 3%, respectively. [Figure not available: see fulltext.] © 2020, The Author(s).enBeyond Standard ModelHadron-Hadron scattering (experiments)Heavy quark productionJet substructureJetsArtículoAttribution 4.0 International (CC BY 4.0)10.1007/JHEP10(2020)061