{
  "abstract": "A bstract : In the conventional Z ′ portal dark matter scenario, the prediction of detectable dark matter χ typically relies on the collider sensitivities of Z ′ and direct detection, where the Majorana type right-handed neutrinos are usually assumed. However, if the right-handed neutrinos ν R are Dirac type, they will contribute to the additional effective number of relativistic species ∆ N eff , which brings different detectable predictions for Z ′ portal dark matter. In light of the great improvement of ∆ N eff for the upcoming experiments, we investigate the Z ′ portal dark matter with Dirac type ν R . Under the U (1) B − L symmetry, this model includes ν R with U (1) B − L charge $$ {Q}_{\\nu_R} $$ Q ν R = −1 and χ with arbitrary Q χ beyond the SM. Based on the relation in the production of χ and ν R , both the WIMP and FIMP dark matter through the Z ′ portal scenario are considered. We perform a comprehensive exploration of the viable parameter space under the constraints from ∆ N eff induced by thermal and non-thermal ν R , perturbative limit, dark matter direct and indirect detection, and collider searches of Z ′ .",
  "abstract_shown": true,
  "affiliations": [
    "Jining University",
    "University of Jinan",
    "Shanghai Jiao Tong University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Ang Liu",
      "orcid": "0009-0003-3518-9050"
    },
    {
      "affs": [
        1
      ],
      "name": "Zhi-Long Han",
      "orcid": "0000-0002-1361-8323"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Fei Huang",
      "orcid": "0000-0002-9483-3454"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8x84vv3w0bf7w.bib",
  "cited_by": 0,
  "doi": "10.1007/jhep10(2026)119",
  "fulltext_url": null,
  "id": "8x84vv3w0bf7w",
  "issns": [
    "1029-8479"
  ],
  "landing_url": "https://link.springer.com/article/10.1007/JHEP10(2026)119",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3106|Dark Matter and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7221793260",
  "pdf_url": "https://link.springer.com/content/pdf/10.1007/JHEP10(2026)119.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-09",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/8x84vv3w0bf7w.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:01Z",
      "native_id": "10.1007/jhep10(2026)119",
      "source": "crossref",
      "url": "https://link.springer.com/article/10.1007/JHEP10(2026)119"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3106|Dark Matter and Cosmic Phenomena",
      "subfield": "high-energy"
    }
  ],
  "title": "Z′ portal dark matter with observable ∆Neff",
  "title_text": "Z′ portal dark matter with observable ∆Neff",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:01Z",
  "url": "https://research.draconitic.com/paper/8x84vv3w0bf7w",
  "venue": "Journal of High Energy Physics",
  "versions": []
}