{
  "abstract": "In principle, searches for CP asymmetries in rare $W$-boson decays can test low-scale leptogenesis in the GeV-scale type-I seesaw with three quasi-degenerate-in-mass heavy right-handed neutrinos. To investigate this, we focus on the lepton-number-violating heavy-neutrino-mediated decay $W^{\\pm}\\to e^{\\pm} e^{\\pm} (\\bar{q} q')^{\\mp}$, with $(\\bar{q} q')^+ = (\\bar{d}u)^+$ and $(\\bar{q} q')^- = (\\bar{u}d)^-$. We determine the minimum branching ratio required for a CP asymmetry to be observable at colliders with a given statistical significance. We then perform a numerical scan of the presently-allowed parameter space, also solving the density matrix equations for low-scale leptogenesis, and identify regions where, simultaneously, the present baryon asymmetry of the Universe can be achieved and the collider CP asymmetry for the considered decay is observable at HL-LHC and FCC-hh. We find that these regions are sizeable. A future observation of a CP asymmetry in $W^{\\pm}\\to e^{\\pm} e^{\\pm} (\\bar{q} q')^{\\mp}$ within the regions identified here would provide evidence in favour of low-scale leptogenesis as the origin of the matter-antimatter asymmetry of the Universe.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.24063",
  "author_total": 5,
  "authors": [
    {
      "name": "Jean-François Fortin"
    },
    {
      "name": "Alessandro Granelli"
    },
    {
      "name": "David London"
    },
    {
      "name": "Serguey T. Petcov"
    },
    {
      "name": "Nicolas Sanfaçon"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a3ra7m91vzsm0.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.24063",
  "fulltext_url": null,
  "id": "a3ra7m91vzsm0",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.24063",
  "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-ph"
    ],
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7223070610",
  "pdf_url": "https://arxiv.org/pdf/2610.24063",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/a3ra7m91vzsm0.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:52Z",
      "native_id": "2610.24063",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.24063"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Testing Leptogenesis via CP asymmetries in Lepton-Number-Violating $W$ Decays at Colliders",
  "title_text": "Testing Leptogenesis via CP asymmetries in Lepton-Number-Violating W Decays at Colliders",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:41Z",
  "url": "https://research.draconitic.com/paper/a3ra7m91vzsm0",
  "venue": "arXiv",
  "versions": []
}