{
  "abstract": "We propose a novel mechanism for generating the baryon asymmetry of the Universe through leptogenesis in a scenario where the right-handed neutrinos are heavier than the maximal temperature of the Universe, and are never produced on-shell, neither by thermal nor by non-thermal mechanisms. We introduce a new scalar field, $ϕ$, lighter than the right-handed neutrinos, that couples to the latter via a Yukawa coupling, so that it decays into two lepton doublets and two higgs doublets via off-shell right-handed neutrinos. Then, we derive the CP asymmetry arising from the interference between tree-level and loop diagrams in the four-body decay, and we show that the generated baryon asymmetry can reproduce the observed value both in a scenario where $ϕ$ is responsible for the reheating of the Universe, and in a scenario where $ϕ$ is a generic scalar that remains in thermal equilibrium with the plasma.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: JHEP 10 (2026) 038",
  "arxiv": "2605.24163",
  "author_total": 3,
  "authors": [
    {
      "name": "Simon Cléry"
    },
    {
      "name": "Alejandro Ibarra"
    },
    {
      "name": "Onur Yonar"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2mqvj9g9w2z5z.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.24163",
  "fulltext_url": null,
  "id": "2mqvj9g9w2z5z",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2605.24163",
  "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",
      "astro-ph.CO"
    ],
    [
      "arxiv",
      "hep-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2605.24163",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2mqvj9g9w2z5z.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:01Z",
      "native_id": "2605.24163",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.24163"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Leptogenesis without on-shell right-handed neutrinos",
  "title_text": "Leptogenesis without on-shell right-handed neutrinos",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:01Z",
  "url": "https://research.draconitic.com/paper/2mqvj9g9w2z5z",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1007/jhep10(2026)038",
      "pid": "apj91nn2xcg00",
      "relation": "published-as",
      "title": "Leptogenesis without on-shell right-handed neutrinos",
      "venue": "Journal of High Energy Physics"
    }
  ]
}