{
  "abstract": "We investigate self-interacting dark matter in an $O(N)$-symmetric real scalar multiplet model with Higgs-portal interactions involving the Standard Model Higgs and a real singlet scalar. After spontaneous breaking of the singlet $\\mathbb{Z}_2$ symmetry, the singlet scalar mixes with the SM Higgs boson. We focus on the regime where the resulting light scalar serves as a mediator, leading to sizable and velocity-dependent self-interactions. We impose constraints from Higgs measurements, rare $B$-meson decays, the dark matter relic abundance, spin-independent direct-detection searches, and scalar coupling perturbativity. We find viable parameter regions in which destructive interference between scalar-mediated scattering amplitudes suppresses the direct-detection cross section while allowing self-interactions relevant to dwarf-galaxy scales. Among these viable parameter regions, a subset also satisfies electroweak vacuum stability up to the Planck scale. Finally, we show that future long-lived-particle searches can probe part of the viable parameter space, providing complementary tests of Higgs-portal self-interacting dark matter with a light scalar mediator.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.38050",
  "author_total": 3,
  "authors": [
    {
      "name": "U-Rae Kim"
    },
    {
      "name": "Jungil Lee"
    },
    {
      "name": "Soo-hyeon Nam"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5ream9qh7djmv.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.38050",
  "fulltext_url": null,
  "id": "5ream9qh7djmv",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.38050",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Dark Matter and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7214903096",
  "pdf_url": "https://arxiv.org/pdf/2609.38050",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5ream9qh7djmv.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2609.38050",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.38050"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Self-interacting $O(N)$ scalar dark matter multiplet in a Higgs-portal model with a light scalar mediator",
  "title_text": "Self-interacting O(N) scalar dark matter multiplet in a Higgs-portal model with a light scalar mediator",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/5ream9qh7djmv",
  "venue": "arXiv",
  "versions": []
}