Searching for weak singlet charged scalar at lepton colliders

TL;DR

This paper evaluates the potential of future lepton colliders to discover weak singlet charged scalars, predicting discovery limits up to 160 GeV depending on the collider and luminosity.

Contribution

It provides the first detailed analysis of the discovery prospects for singlet charged scalars at upcoming lepton colliders.

Findings

Discovery potential up to 118 GeV at CEPC with 5 ab^{-1}

Discovery potential up to 136 GeV at ILC-350 with 1 ab^{-1}

Discovery potential up to 160 GeV at ILC-500 with 1 ab^{-1}

Abstract

A weak singlet charged scalar exists in many new physics models beyond the Standard Model. The discovery potential of the singlet charged scalar is explored at future lepton colliders, e.g. the CEPC, ILC-350 and ILC-500. We demonstrate that one can discover the singlet charged scalar up to 118 GeV at the CEPC with an integrated luminosity of $5~\mathrm{ab}^{-1}$. At the ILC-350 and the ILC-500 with an integrated luminosity of $1~\mathrm{ab}^{-1}$ such a discovery limit can be further improved to 136 GeV and 160 GeV, respectively.