{
  "abstract": "Much of the literature on neutrinoless double beta ($0νββ$) decay with light new-physics mediators focuses on invisible missing energy. We investigate the scenario in which a massive Majoron-like particle $ϕ$ is produced on-shell during $0νββ$ decay and subsequently decays into visible final states after travelling a macroscopic distance. Specifically, we analyze the displaced energy deposition from $ϕ$ decays into a photon pair ($γγ$), a photon and a dark photon ($γγ_D$) and an electron-positron pair ($e^+e^-$). We demonstrate that the displaced decays modify the expected visible energy spectra and provide novel, distinct experimental signatures at current and upcoming $0νββ$ experiments, with the promise of improving the sensitivity of the standard invisible Majoron searches in $0νββ$ decay by more than two orders of magnitude. The relevant effective couplings can naturally arise in well-motivated ultraviolet-complete scenarios that conventional $0νββ$ decay searches cannot probe.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.05352",
  "author_total": 5,
  "authors": [
    {
      "name": "Patrick D. Bolton"
    },
    {
      "name": "Noor-Inès Boudjema"
    },
    {
      "name": "Frank F. Deppisch"
    },
    {
      "name": "Chandan Hati"
    },
    {
      "name": "Chayan Majumdar"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1y10f3cpd1bcm.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.05352",
  "fulltext_url": null,
  "id": "1y10f3cpd1bcm",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.05352",
  "language": null,
  "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-ex"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Neutrino Physics Research"
    ]
  ],
  "openalex": "W7211885458",
  "pdf_url": "https://arxiv.org/pdf/2609.05352",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-04",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1y10f3cpd1bcm.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:14Z",
      "native_id": "2609.05352",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.05352"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Displaced Signals from Long-lived Particles in Neutrinoless Double Beta Decay",
  "title_text": "Displaced Signals from Long-lived Particles in Neutrinoless Double Beta Decay",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:14Z",
  "url": "https://research.draconitic.com/paper/1y10f3cpd1bcm",
  "venue": "arXiv",
  "versions": []
}