# Search for the singlet vector-like top quark in the $T\to tZ$ channel with $Z\to \nu\bar{\nu}$ at hadron colliders

## TL;DR

This paper investigates the potential to detect a singlet vector-like top quark in the $tZ$ decay channel with $Z$ to neutrinos at various hadron colliders, analyzing backgrounds, detector effects, and parameter space constraints.

## Contribution

It introduces a simplified model for the vector-like top quark and evaluates its observability at different collider energies with detailed simulations and parameter scans.

## Key findings

- Potential exclusion and discovery regions identified for different collider energies.
- Constraints from electroweak precision observables considered.
- Sensitivity depends on the coupling constant and top quark mass.

## Abstract

Based on a simplified model including a singlet vector-like top quark $T$ with charge $|Q|=2/3$, we analyze the prospects of observing $T$ via the single $T$ production in the $tZ$ channel with $Z$ decaying to neutrinos at the hadron-hadron colliders. This simplified model only includes two free parameters, the coupling constant $g^*$ and the $T$ quark mass $m_T$. To investigate the observability of the single $T$ production, we perform a detailed background analysis and detector simulation for the collision energies 14~TeV, 27~TeV, and 100~TeV. We scan the $g^*-m_T$ parameter space and show the exclusion and discovery capabilities on the $T$ quark with the highest integrated luminosity designed at these colliders. Moreover, the limits from the narrow-width approximation and electroweak precision observables are considered.