2026-03-12T08:11:22Z https://iwate-u.repo.nii.ac.jp/oai

oai:iwate-u.repo.nii.ac.jp:00015794 2023-05-15T12:50:42Z 1523:1670

Probing a degenerate-scalar scenario in a pseudoscalar dark-matter model ABE, Sachiho CHO, Gi-Chol MAWATARI, Kentarou 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 5σ with an integrated luminosity of 2 ab-1. journal article The American Physical Society 2021-08-25 VoR application/pdf Physical Review D 3 104 035023 24700010 https://iwate-u.repo.nii.ac.jp/record/15794/files/prd-v104n3p035023.pdf https://iwate-u.repo.nii.ac.jp/records/15794 eng info:doi/10.1103/PhysRevD.104.035023 © 2021 authors. https://creativecommons.org/licenses/by/4.0/