{
  "abstract": "We construct a minimal Majorana singlet-vector-like-doublet model for the single nuclear-recoil-like event reported by LZ near 248 keV. At the splitting inferred from the recoil energy, an electroweak-strength $Z$ transition predicts thousands of events; singlet-doublet mixing suppresses the rate without moving the recoil spectrum. Fixed-coupling interpretations instead require a larger splitting in the extreme halo tail, but solar gravitational acceleration removes this suppression, while the larger splitting shifts recoils toward LZ's empty high-energy sideband. In our model the same mixing suppresses solar capture and annihilation, while the small mass gap required for coannihilation weakens Higgs-mediated cooling, allowing the captured population to remain extended and out of equilibrium. Imposing the relic abundance and normalizing the rate to one event leaves a two-dimensional mass-splitting parameter space. A thermalized population gives the conservative IceCube limit $δ=$300-301 keV; with our nonthermal cooling ansatz and elastic scattering treated at tree level, the nominal limit is $δ=$331-341 keV near the 730-733 GeV relic-density endpoint, which is also favored by the recoil spectrum. We outline a gauged $U(1)_N$ origin for the parity and splitting and a candidate $R$-symmetric supersymmetric embedding.",
  "abstract_shown": true,
  "affiliations": [
    "Quantum Universe Center , KIAS , 85 Hoegi-ro , Dongdaemun-gu , Seoul 02455 , Korea",
    "School of Physics , KIAS , 85 Hoegi-ro , Dongdaemun-gu , Seoul 02455 , Korea",
    "Gravity, Spacetime, and Particle Physics (GRASP) Initiative , Harvard University , 17 Oxford Street , Cambridge , MA 02138 , USA"
  ],
  "article_type": null,
  "arxiv": "2609.09138",
  "author_total": 2,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "Seung J. Lee"
    },
    {
      "affs": [
        2,
        1
      ],
      "name": "Taewook Youn",
      "orcid": "0000-0003-2229-5025"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3tb3hnd358g8r.bib",
  "cited_by": 33,
  "doi": "10.48550/arxiv.2609.09138",
  "fulltext_url": null,
  "id": "3tb3hnd358g8r",
  "issns": [
    "2331-8422"
  ],
  "landing_url": "https://arxiv.org/abs/2609.09138",
  "language": "en",
  "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": "W7211993225",
  "pdf_url": "https://arxiv.org/pdf/2609.09138",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-08",
  "publisher": "Cornell University",
  "ris": "https://research.draconitic.com/paper/3tb3hnd358g8r.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:41Z",
      "native_id": "2609.09138",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.09138"
    },
    {
      "first_seen": "2026-11-07T13:20:44Z",
      "native_id": "W7211993225",
      "source": "openalex",
      "url": "https://arxiv.org/abs/2609.09138"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Mixing-suppressed inelastic dark matter: a minimal model for the LZ 248 keV event",
  "title_text": "Mixing-suppressed inelastic dark matter: a minimal model for the LZ 248 keV event",
  "type": "preprint",
  "updated_at": "2026-11-08T13:20:37Z",
  "url": "https://research.draconitic.com/paper/3tb3hnd358g8r",
  "venue": "arXiv",
  "versions": []
}