{
  "abstract": "In the conventional $Z^\\prime$ portal dark matter scenario, the prediction of detectable dark matter $χ$ typically relies on the collider sensitivities of $Z^\\prime$ 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 $ΔN_{\\rm eff}$, which brings different detectable predictions for $Z^\\prime$ portal dark matter. In light of the great improvement of $ΔN_{\\rm eff}$ for the upcoming experiments, we investigate the $Z^\\prime$ 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 $Q_{ν_R}=-1$ 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 $Z^\\prime$ portal scenario are considered. We perform a comprehensive exploration of the viable parameter space under the constraints from $ΔN_{\\rm eff}$ induced by thermal and non-thermal $ν_R$, perturbative limit, dark matter direct and indirect detection, and collider searches of $Z^\\prime$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: JHEP10(2026)119",
  "arxiv": "2607.08082",
  "author_total": 3,
  "authors": [
    {
      "name": "Ang Liu"
    },
    {
      "name": "Zhi-Long Han"
    },
    {
      "name": "Fei Huang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/20rd5fr7sz9jb.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.08082",
  "fulltext_url": null,
  "id": "20rd5fr7sz9jb",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.08082",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Dark Matter and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7167906269",
  "pdf_url": "https://arxiv.org/pdf/2607.08082",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/20rd5fr7sz9jb.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:50Z",
      "native_id": "2607.08082",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.08082"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "$Z^\\prime$ Portal Dark Matter with Observable $ΔN_{\\rm eff}$",
  "title_text": "Z^′ Portal Dark Matter with Observable ΔN_eff",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:50Z",
  "url": "https://research.draconitic.com/paper/20rd5fr7sz9jb",
  "venue": "arXiv",
  "versions": []
}