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We explore the sensitivity of the LHC at 14 TeV centre-of-mass energy (LHC14)to the single production and decay of top-antitop resonances in the four-topfinal state. We focus on the same-sign dilepton channel, and work within asimplified model with a vector boson coupling to the Standard Model only viaits interactions with right-handed top quarks. We find it is possible todiscover (exclude) such a vector boson with 300 fb$^{-1}$ of integratedluminosity up to a mass of 1.2 (1.6) TeV for a modest coupling to tops of$g_\rho$=2. We present our results as an exclusion limit on thecross-section$\times$branching ratio for ease of recasting, and interpret themin the context of the gauge-singlet vector boson $\rho_X$ present in manysimple Composite Higgs theories.

Probing top-antitop resonances with $t\bar{t}$ scattering at LHC14