Single production of vector-like $T$ quark at future high-energy linear $e^{+}{e}^{-}$ collider

Abstract

Based on a model-independent framework including the vector-like top partner (VLQ-$T$), we investigate the prospect of discovering the singlet or doublet VLQ-$T$ via the single production process $e^{-}{e}^{+}\to T\bar{t}+t\bar{T}$ with the $T\to Zt$ decay channel at future high energy linear $e^{+}{e}^{-}$ collider with $\sqrt{s}=3$ TeV. We focus on the hadronic decay of the top quark and two types of decay channel for the $Z$ boson: $Z\to {\ell }^{+}{\ell }^{-}$ and $Z\to \nu \bar{\nu }$. By carrying out a full simulation for the signals and the relevant SM backgrounds, the $2\sigma$ exclusion limit and $5\sigma$ discovery prospects are, respectively, obtained on the VLQ-$T$ mass and the coupling strength $g^{\ast }$ with the integrated luminosity of 5 ab${}^{-1}$. In addition, we considered the initial state radiation and beamstrahlung effects as well as the systematic uncertainty effects of backgrounds, which are found to reduce the excluding or discovery capability.

20 pages, 15 figures, version accepted for publication in Physical Review D. arXiv admin note: text overlap with arXiv:2112.15044 by other authors

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• Exploring vector-like $B$-quark pair production at CLIC in fully hadronic final states
• Searching for single production of vectorlike quarks decaying into Wb at a future muon-proton collider