{
  "abstract": "A bstract : 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": [
    "TUM School of Natural Sciences, Technical University of Munich"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Simon Cléry",
      "orcid": "0000-0002-4261-3679"
    },
    {
      "affs": [
        0
      ],
      "name": "Alejandro Ibarra",
      "orcid": "0000-0001-9935-5247"
    },
    {
      "affs": [
        0
      ],
      "name": "Onur Yonar",
      "orcid": "0009-0007-1967-3992"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/apj91nn2xcg00.bib",
  "cited_by": 0,
  "doi": "10.1007/jhep10(2026)038",
  "fulltext_url": null,
  "id": "apj91nn2xcg00",
  "issns": [
    "1029-8479"
  ],
  "landing_url": "https://link.springer.com/10.1007/JHEP10(2026)038",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7162413887",
  "pdf_url": "https://link.springer.com/content/pdf/10.1007/JHEP10(2026)038.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-02",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/apj91nn2xcg00.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:01Z",
      "native_id": "10.1007/jhep10(2026)038",
      "source": "crossref",
      "url": "https://link.springer.com/10.1007/JHEP10(2026)038"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3106|Particle physics theoretical and experimental studies",
      "subfield": "high-energy"
    }
  ],
  "title": "Leptogenesis without on-shell right-handed neutrinos",
  "title_text": "Leptogenesis without on-shell right-handed neutrinos",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:01Z",
  "url": "https://research.draconitic.com/paper/apj91nn2xcg00",
  "venue": "Journal of High Energy Physics",
  "versions": [
    {
      "doi": "10.48550/arxiv.2605.24163",
      "pid": "2mqvj9g9w2z5z",
      "relation": "preprint",
      "title": "Leptogenesis without on-shell right-handed neutrinos",
      "venue": "arXiv"
    }
  ]
}