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

TL;DR

This paper investigates the potential of future high-energy proton colliders to constrain four-fermion operators involving three top quarks using triple top production and detailed simulations.

Contribution

It provides the first detailed sensitivity analysis of triple top production at future colliders within the SMEFT framework, including realistic detector effects.

Findings

Future colliders can significantly improve bounds on three-top four-fermion operators.

Sensitivity reaches are promising at HE-LHC and FCC-hh energies.

The analysis uses a unique same-sign lepton signature with full background consideration.

Abstract

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