{
  "abstract": "The non-standard self-interactions of neutrinos could be induced by (light) scalars that couple primarily to neutrinos. In this work, we investigate the effects of neutrinophilic scalars $ϕ$ on muon decays at the tree, 1-loop and 2-loop levels, considering both Dirac and Majorana neutrinos. The most phenomenologically interesting processes are the 1-loop decay $μ\\to e ϕϕ$ and $ϕ$-induced decay $μ\\to e γ$ at the 2-loop order from the same coupling $g_{\\rm eff}$, and the 1-loop corrections of $ϕ$ to the SM muon decay and the four-body muon decays $μ^- \\to e^- ν_μν_μϕ,\\, e^- \\barν_e \\barν_e ϕ$, both induced by the coupling $h_{eμ}$ of $ϕ$ to Majorana neutrinos. The current experimental bounds on $μ\\to e γ$ provide the most stringent limits on the coupling $g_{\\rm eff}$, up to roughly 0.064, for the scalar mass $m_ϕ\\gtrsim 8.7$ MeV. The precise $G_F$ measurements constrain the coupling $|h_{eμ}|$ down to roughly $0.027$, with the scalar mass $m_ϕ$ constrained up to roughly $5.9$ TeV. For $m_ϕ\\gtrsim {\\cal O}({\\rm GeV})$, the $G_F$ measurements are more stringent than other existing laboratory, astrophysical and cosmological constraints. Some other $ϕ$-induced processes are also possible, which are, however, heavily suppressed by the tiny neutrino masses and/or the loop factor.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.13964",
  "author_total": 2,
  "authors": [
    {
      "name": "Yongchao Zhang"
    },
    {
      "name": "Zhong Zhang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dr6pv54jg4d13.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.13964",
  "fulltext_url": null,
  "id": "dr6pv54jg4d13",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.13964",
  "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-ex"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7213328058",
  "pdf_url": "https://arxiv.org/pdf/2609.13964",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dr6pv54jg4d13.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:26:45Z",
      "native_id": "2609.13964",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.13964"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Probing Neutrinophilic Scalars in Muon Decays",
  "title_text": "Probing Neutrinophilic Scalars in Muon Decays",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:45Z",
  "url": "https://research.draconitic.com/paper/dr6pv54jg4d13",
  "venue": "arXiv",
  "versions": []
}