{
  "abstract": "The scotogenic model generates sub-eV neutrino masses radiatively through small Yukawa couplings $\\sim\\mathcal{O}(10^{-3})$ that also set the decay length of the heavy neutral fermion $\\Ntwo$; in the compressed regime a separate, much smaller Yukawa entry $\\sim\\mathcal{O}(10^{-6})$ additionally renders the charged scalar $\\etapm$ long-lived. We study the compressed-spectrum regime of its two-inert-doublet variant ($\\DMcomp = \\mHpm - \\mNtwo \\simeq 200\\MeV$), in which small Yukawa entries render both the charged scalar $\\etapm$ and the heavy neutral fermion $\\Ntwo$ long-lived and produce a nested cascade at the High-Luminosity LHC~(HL-LHC): $\\etapm$ leaves a disappearing track~(DT), decays to an invisible $\\Ntwo$, which travels macroscopically before forming a displaced dilepton vertex~(DV). The two slow flights combine into a 4D time-of-flight delay $\\dt\\sim200$--$800\\ps$ resolvable by the CMS MIP Timing Detector, while the DT-to-DV displacement vector inherits the parent track direction, yielding a spatial back-pointing correlation with no SM analogue. These two handles are expected to suppress the background to $B\\sim10^{-5}$--$10^{-3}$ events, and the discovery remains $5σ$-significant for any background up to $B\\sim10$ events. At the benchmark ($\\mNtwo=150\\GeV$ and proper decay lengths $\\ctauH=300\\mm$, $\\ctauN=189\\mm$) the strategy yields $N_s\\approx1212$ signal events at $3000\\ifb$ and establishes sensitivity across $15\\mm\\lesssim\\ctauH\\lesssim300\\mm$, $10\\mm\\lesssim\\ctauN\\lesssim1000\\mm$, a correlated region left uncovered by any standalone DT or DV search. Because the $\\Ntwo$ decay length is controlled by the same Yukawa couplings that generate sub-eV neutrino masses, mapping this nested cascade turns the HL-LHC into a direct collider probe of the interaction responsible for neutrino mass.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Eur. Phys. J. C 86, 1187 (2026)",
  "arxiv": "2609.28334",
  "author_total": 1,
  "authors": [
    {
      "name": "Renjie Wang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9g3mp46w35swy.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.28334",
  "fulltext_url": null,
  "id": "9g3mp46w35swy",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.28334",
  "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-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.28334",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-23",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9g3mp46w35swy.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:52Z",
      "native_id": "2609.28334",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.28334"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Nested Disappearing-Track plus Displaced-Vertex Topology at the HL-LHC: A Dual Long-Lived-Particle Signature of the Scotogenic Model",
  "title_text": "Nested Disappearing-Track plus Displaced-Vertex Topology at the HL-LHC: A Dual Long-Lived-Particle Signature of the Scotogenic Model",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:41Z",
  "url": "https://research.draconitic.com/paper/9g3mp46w35swy",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1140/epjc/s10052-026-16416-2",
      "pid": "3drb0jxf1gerr",
      "relation": "published-as",
      "title": "Nested disappearing-track plus displaced-vertex topology at the HL-LHC: a dual long-lived-particle signature of the scotogenic model",
      "venue": "The European Physical Journal C"
    }
  ]
}