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

Abstract

Our main aim in this paper is to constrain the effective field theory describing the top quark couplings through the $e^{-}{e}^{+}\to t\bar{t}+$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 $10^{-4}$.

Comments: 20 pages, 2 table, 7 figures, Accepted for publication in Physics Letters B