{
  "abstract": "LUX-ZEPLIN (LZ) reported a $248~\\mathrm{keV}$ nuclear-recoil event. Exothermic dark matter can explain it in a dark $U(1)$ model whose dark Higgs generates the dark photon mass and the mass splitting. A computed excited-state fraction gives two branches with dark photon masses near $1$ and $26~\\mathrm{GeV}$ for kinetic mixing $ε=10^{-4}$. INTEGRAL/SPI limits on excited-state decays bound the LZ rate, and cosmic microwave background limits exclude the lighter branch at its likelihood minimum. For a dark Higgs boson near the dark photon mass, the heavier branch agrees with the southern-sky Galactic Center $γ$-ray excess.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.25423",
  "author_total": 3,
  "authors": [
    {
      "name": "Jinheung Kim"
    },
    {
      "name": "Jongkuk Kim"
    },
    {
      "name": "Pyungwon Ko"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7khp16av419jp.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.25423",
  "fulltext_url": null,
  "id": "7khp16av419jp",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.25423",
  "language": null,
  "licence": "CC0-1.0",
  "licence_label": "CC0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/publicdomain/zero/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-ex"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Dark Matter and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7223065331",
  "pdf_url": "https://arxiv.org/pdf/2610.25423",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/7khp16av419jp.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2610.25423",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.25423"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Exothermic Dark Matter with a Dark Higgs: The LZ 248 keV Event and the Galactic Center Excess",
  "title_text": "Exothermic Dark Matter with a Dark Higgs: The LZ 248 keV Event and the Galactic Center Excess",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/7khp16av419jp",
  "venue": "arXiv",
  "versions": []
}