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arXiv · 2101.04887

Probing a degenerate-scalar scenario in a pseudoscalar dark-matter model

Sachiho Abe·Gi-Chol Cho·Kentarou Mawatari
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Abstract

We study a pseudoscalar dark-matter model arising from a complex singlet extension of the standard model (SM), and show that the dark-matter--nucleon scattering is suppressed when two CP-even scalars are degenerate. In such a degenerate-scalar scenario we explore the model parameter space which satisfies constraints from the direct detection experiments and the relic density of dark matter. In addition, we discuss a possibility to verify such a scenario by using the recoil mass technique at the International Linear Collider. We find that a pair of states separated by 0.2 GeV can be distinguished from the single SM-like Higgs state at 5$\sigma$ with integrated luminosity of 2 ab$^{-1}$.

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Sachiho Abe, Gi-Chol Cho, Kentarou Mawatari. 2021-01-13. Probing a degenerate-scalar scenario in a pseudoscalar dark-matter model. https://doi.org/10.1103/physrevd.104.035023

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