{
  "abstract": "The extension of the LUX--ZEPLIN nuclear-recoil analysis to approximately $270\\,\\mathrm{keV}$ probes a qualitatively new dark-matter regime in which endothermic scattering can suppress conventional low-energy recoils and concentrate the surviving spectrum near the Galactic high-velocity tail. We construct a modular-$S_4$ realization in which a minimal $2N_R+2S$ inverse seesaw accounts for lepton flavor, while a separate pair of Standard-Model-singlet fermions forms the pseudo-Dirac state relevant for high-recoil xenon scattering. The sectors share a common complex modulus $τ$, so the modular forms selected by charged-lepton and neutrino data also enter the operators generating the dark Dirac mass and Majorana splitting. Our scan yields $181447$ lepton-sector solutions satisfying $χ^2_{\\ell+ν}<30$, distributed among several disconnected modular regions, and predicts one effectively massless light neutrino at leading order. Restoring the physical scales allows TeV-scale heavy quasi-Dirac neutral fermions with small non-unitarity. We subsequently scan $2\\times10^6$ dark-sector points only over flavor-accepted values of $τ$ and identify common-modulus solutions in the LZ-oriented region $300\\,\\mathrm{GeV}\\le m_χ\\le2\\,\\mathrm{TeV}$ and $300\\,\\mathrm{keV}\\leδ\\le400\\,\\mathrm{keV}$. An exploratory two-bin Poisson likelihood, including endothermic xenon kinematics, the Helm form factor, Standard-Halo-Model velocities, Gaussian energy smearing, and profiling over the signal normalization, gives a best grid point at $(m_χ,δ)\\simeq(1.847\\,\\mathrm{TeV},371.5\\,\\mathrm{keV})$, close to the terrestrial inelastic kinematic ceiling. The construction provides a direct link between modular lepton flavor, TeV-scale inverse-seesaw dynamics, and high-recoil inelastic dark matter.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.15557",
  "author_total": 3,
  "authors": [
    {
      "name": "Waqas Ahmed"
    },
    {
      "name": "Vasileios Basiouris"
    },
    {
      "name": "George K. Leontaris"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/an69758a7xecj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.15557",
  "fulltext_url": null,
  "id": "an69758a7xecj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.15557",
  "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-ex"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "arxiv",
      "hep-th"
    ],
    [
      "openalex",
      "3106|Dark Matter and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7221794843",
  "pdf_url": "https://arxiv.org/pdf/2610.15557",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-11",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/an69758a7xecj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2610.15557",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.15557"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Modular $S_4$ Inverse Seesaw at the LZ High-Recoil Frontier",
  "title_text": "Modular S_4 Inverse Seesaw at the LZ High-Recoil Frontier",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/an69758a7xecj",
  "venue": "arXiv",
  "versions": []
}