{
  "abstract": "We study the mono-photon signature $μ^+μ^-\\toγa\\toγν\\barν$ at $3$ and $10\\TeV$ muon colliders, with integrated luminosities of $1$ and $10\\,\\mathrm{ab}^{-1}$, in a two-coupling axion-like-particle (ALP) simplified model. Five benchmarks spanning $m_a=100$--$1000\\GeV$ are generated at $g_{aγγ}=0.01\\TeV^{-1}$ and flavor-universal pseudoscalar neutrino couplings $y_ν=0.1$ or $0.3$, giving invisible branching fractions above 99.995\\% and mono-photon cross sections of $0.00854$--$0.01217\\,\\mathrm{fb}$. Assuming a 1\\% background normalization uncertainty, a cut-based photon-line selection gives projected 95\\% sensitivity to $g_{aγγ}\\simeq0.039$--$0.045\\TeV^{-1}$ at $3\\TeV$ and $0.0137$--$0.0140\\TeV^{-1}$ at $10\\TeV$. A ROOT/TMVA gradient-boosted decision tree with validation-fixed thresholds reaches held-out AUC values of $0.9967$--$0.9993$ and $g_{95}=0.0192$--$0.0400\\TeV^{-1}$ at $3\\TeV$ and $0.0122$--$0.0144\\TeV^{-1}$ at $10\\TeV$. Because only 2-41 irreducible-background test events populate the optimized classifier tails, the mass--coupling contours are reported as projected expected sensitivities rather than profile-likelihood or CL$_s$ exclusions. A separate appendix records a phenomenological, parton-level HNL diphoton feasibility study; it is not used to claim detector-level sensitivity or exclusion.} \\keywords{Axion-like particles, muon collider, mono-photon, diphoton, heavy neutral leptons, neutrinos, multivariate analysis, effective field theory",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.27006",
  "author_total": 4,
  "authors": [
    {
      "name": "Ijaz Ahmed"
    },
    {
      "name": "Waqas Ahmad"
    },
    {
      "name": "M. Tayyab Javaid"
    },
    {
      "name": "Jamil Muhammad"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/cbk59gq6xx32n.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.27006",
  "fulltext_url": null,
  "id": "cbk59gq6xx32n",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.27006",
  "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": "W7223093262",
  "pdf_url": "https://arxiv.org/pdf/2610.27006",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-19",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/cbk59gq6xx32n.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:04Z",
      "native_id": "2610.27006",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.27006"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Axion-Like Particle Searches at Muon Colliders: Photon-Neutrino Signatures and Heavy-Neutral-Lepton Feasibility",
  "title_text": "Axion-Like Particle Searches at Muon Colliders: Photon-Neutrino Signatures and Heavy-Neutral-Lepton Feasibility",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:04Z",
  "url": "https://research.draconitic.com/paper/cbk59gq6xx32n",
  "venue": "arXiv",
  "versions": []
}