Loop induced singlet scalar production through the vector like top quark at future lepton colliders

TL;DR

This paper investigates the production of a new singlet scalar via loop processes involving a vector-like top quark at future lepton colliders, highlighting potential sensitivity beyond current collider constraints.

Contribution

It introduces a novel analysis of singlet scalar production through loop diagrams with vector-like quarks at future lepton colliders, providing sensitivity estimates and exclusion limits.

Findings

Significant sensitivity to the model parameter space at future colliders.

Exclusion limits surpass current LHC and electroweak precision constraints.

Potential for discovery of singlet scalars in upcoming collider experiments.

Abstract

In this paper, we explore the signature of a simplified model which includes a new singlet scalar state and a vector like quark at future lepton colliders. In particular, we study the production of the new singlet scalar in association with a photon, which proceeds through loop level diagrams involving vector like top quark partner, at future $e^-e^+$ colliders with different center-of-mass energies from 500 GeV to 3 TeV. To show the sensitivity of the process, the exclusion limits on the parameter space of the model are presented considering the decay of the singlet scalar into a pair of Higgs boson, followed by the decay of Higgs bosons into $b\bar{b}$ pairs. The results are compared to those obtained from the LHC, electroweak precision data and other channels at lepton colliders and it is shown that a notable sensitivity to the parameter space of the simplified model could be achieved.