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In this paper, we study the triple top quark production at the futurehigh-energy proton-proton colliders to probe the four-fermion interactionsinvolving three top quarks. We employ the Standard Model Effective Field Theory(SMEFT) to find the upper limits at $95\%$ CL on the Wilson coefficients ofthese kinds of four-fermion operators. We consider a detailed analysis with aunique signal signature of two same-sign leptons. A full simulation chainincludes all the relevant backgrounds, realistic detector simulations and acut-based technique are taken into account. This study is presented for theHE-LHC working at the center of mass energy of 27 TeV with 15~ab$^{-1}$ andFCC-hh working at the center of mass energy of 100 TeV with 30~ab$^{-1}$. Weshow that the future high-energy proton-proton colliders could reach animpressive sensitivity to four-fermion contact interactions involving three topquarks.

Probing four-fermion operators in the triple top production at future hadron colliders