{
  "abstract": "We study a five-dimensional realization of endothermic dark matter motivated by the recent high-recoil LUX-ZEPLIN event. A pseudo-Dirac Standard-Model singlet fermion is localized in the extra dimension and couples to a bulk $U(1)_D$ gauge field. The same localization that suppresses a distant-brane Majorana operator and generates the inelastic splitting also controls the couplings to the Kaluza--Klein (KK) dark-photon tower, producing a localization-filtered mediator propagator. We organize the phenomenology around two representative mass--splitting points: an LZ benchmark, $m_χ=1.10~\\TeV$ and $δ=365~\\keV$, and an IceCube-motivated comparison point, $m_χ=1.08~\\TeV$ and $δ=566~\\keV$. The latter is used only to compare terrestrial and solar kinematics; the published IceCube bound is Higgsino-specific and is not directly imposed on our singlet KK model. At the LZ benchmark with $R^{-1}=0.30~\\GeV$ and $m_0=0.10~\\GeV$, the KK tower enhances the high-recoil xenon rate by a factor of about four relative to a single dark photon at fixed microscopic coupling. The LZ point lies just below the terrestrial halo speed ceiling, whereas the $566~\\keV$ comparison point is inaccessible to ordinary xenon scattering and instead lies in a kinematic regime accessible to solar capture; any neutrino constraint on the present singlet model remains dependent on its capture and annihilation dynamics. The characteristic prediction of the extra-dimensional construction is therefore a correlated interplay of localization, KK spectral distortion, and inelastic kinematics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.22739",
  "author_total": 2,
  "authors": [
    {
      "name": "Waqas Ahmed"
    },
    {
      "name": "George K. Leontaris"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/29kpjys0yn0t0.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.22739",
  "fulltext_url": null,
  "id": "29kpjys0yn0t0",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.22739",
  "language": null,
  "licence": "CC-BY-NC-SA-4.0",
  "licence_label": "CC BY-NC-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "arxiv",
      "hep-ex"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "arxiv",
      "hep-th"
    ],
    [
      "openalex",
      "3106|Dark Matter and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7214001629",
  "pdf_url": "https://arxiv.org/pdf/2609.22739",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-19",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/29kpjys0yn0t0.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:19Z",
      "native_id": "2609.22739",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.22739"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Kaluza--Klein Dark-Photon Mediation of Inelastic Dark Matter at LUX-ZEPLIN",
  "title_text": "Kaluza--Klein Dark-Photon Mediation of Inelastic Dark Matter at LUX-ZEPLIN",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:19Z",
  "url": "https://research.draconitic.com/paper/29kpjys0yn0t0",
  "venue": "arXiv",
  "versions": []
}