{
  "abstract": "Motivated by the $2.6σ$ high-energy recoil event recently reported by the LUX-ZEPLIN (LZ) Collaboration, we consider an endothermic $Z^\\prime$-portal Majorana dark matter framework and discuss the complementarity between the LZ event and LHC searches for a $Z^\\prime$ resonance. As a concrete realization, we consider a gauged U(1) ${B-L}$ extension of the Standard Model. The phenomenology of the framework is essentially controlled by two free parameters: the U(1) ${B-L}$ gauge coupling $g_{BL}$ and the $Z^\\prime$ boson mass $m_{Z^\\prime}$. For a fixed $m_{Z^\\prime}$, the observed dark matter abundance requires the dark matter mass to be near the $Z^\\prime$ resonance, $m_{\\rm DM} \\sim m_{Z^\\prime}/2$, and sets a lower bound on $g_{BL}$. Complementarily, LHC searches for a $Z^\\prime$ resonance set an upper bound on $g_{BL}$. The parameter space allowed by the dark matter abundance and LHC constraints can account for the recent LZ event. The synergy between future $Z^\\prime$ resonance searches at the High-Luminosity LHC and the LZ experiment may provide a test of this framework.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.21011",
  "author_total": 2,
  "authors": [
    {
      "name": "Nobuchika Okada"
    },
    {
      "name": "Digesh Raut"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/481h1tqjz1jpf.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.21011",
  "fulltext_url": null,
  "id": "481h1tqjz1jpf",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.21011",
  "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",
      "astro-ph.CO"
    ],
    [
      "arxiv",
      "hep-ex"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "arxiv",
      "hep-th"
    ],
    [
      "openalex",
      "3106|Dark Matter and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7213988581",
  "pdf_url": "https://arxiv.org/pdf/2609.21011",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-24",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/481h1tqjz1jpf.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:24:11Z",
      "native_id": "2609.21011",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.21011"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Endothermic Z'-Portal Dark Matter: LZ-LHC Complementarity",
  "title_text": "Endothermic Z'-Portal Dark Matter: LZ-LHC Complementarity",
  "type": "preprint",
  "updated_at": "2026-10-30T12:24:11Z",
  "url": "https://research.draconitic.com/paper/481h1tqjz1jpf",
  "venue": "arXiv",
  "versions": []
}