Constraining the top quark effective field theory using the top quark pair production in association with a jet at future lepton colliders

TL;DR

This paper investigates how future lepton colliders can constrain the effective field theory of top quark couplings by analyzing top pair production with an associated jet at different energies, considering realistic detector effects.

Contribution

It provides expected limits on top quark effective couplings at future colliders using detailed simulations of the $tar{t}+$jet process at 500 and 3000 GeV.

Findings

95% CL limits on Wilson coefficients can reach $10^{-4}$

Constraints are derived for $tar{t}\gamma$, $tar{t}Z$, and $tar{t}g$ couplings

Analysis includes realistic detector simulation and background estimation.

Abstract

Our main aim in this paper is to constrain the effective field theory describing the top quark couplings through the $e^{-} e^{+} \rightarrow t \bar{t}+$jet process. The analysis is carried out considering two different center-of-mass energies of 500 and 3000 GeV including a realistic simulation of the detector response and the main sources of background processes. The expected limits at 95\% CL are derived on the new physics couplings such as $t \bar t \gamma$, $t \bar t Z$, and $t \bar t g$ for each benchmark scenario using the dileptonic $t \bar{t}$ final state. We show that the 95\% CL limits on dimensionless Wilson coefficients $\bar{c}_i$ considered in this analysis could be probed down to $10^{-4}$.