Searching for weak singlet charged scalar at lepton colliders

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.

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