{
  "abstract": "We investigate spin-resolved decay of an axion-like particle (ALP) into an electron--positron pair in an intense laser field. Using the Baier--Katkov quasiclassical operator formalism in a constant crossed field, we derive a compact analytic rate retaining finite ALP-mass effects and the lepton spin degrees of freedom. In the massless limit, the spin-summed rate has the same weak- and strong-field asymptotic scalings as the corresponding photon-induced pair-creation rate, while the pseudoscalar coupling induces distinct spin-resolved channels and spin correlations. A finite ALP mass reorganizes the spectrum across the vacuum threshold, producing purely field-induced pair creation below threshold and spin-dependent oscillatory modulations above threshold through the coherent interplay of vacuum and field-assisted contributions. The entanglement of the produced pair reflects the dominant pair-creation mechanism. After the emission angles have been traced out, the reduced spin state near the vacuum threshold in weak fields is nearly maximally entangled and singlet-like. In the strong-field regime, it becomes triplet-like while retaining a concurrence approaching 1/2, whereas deep in the vacuum-dominated above-threshold regime it becomes triplet-like and separable. These results establish spin-resolved spectra and entanglement as characteristic signatures of finite-mass and threshold effects in strong-field ALP decay.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2607.14558",
  "author_total": 3,
  "authors": [
    {
      "name": "Xiaodan Mao"
    },
    {
      "name": "Yue-Yue Chen"
    },
    {
      "name": "Pei-Lun He"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/50ffnsr1jp8p3.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.14558",
  "fulltext_url": null,
  "id": "50ffnsr1jp8p3",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.14558",
  "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"
    ],
    [
      "arxiv",
      "quant-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2607.14558",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-19",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/50ffnsr1jp8p3.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:52Z",
      "native_id": "2607.14558",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.14558"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Spin-Resolved Decay of Axion-Like Particles into Electron--Positron Pairs in Strong Electromagnetic Fields",
  "title_text": "Spin-Resolved Decay of Axion-Like Particles into Electron--Positron Pairs in Strong Electromagnetic Fields",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:41Z",
  "url": "https://research.draconitic.com/paper/50ffnsr1jp8p3",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/439q-t2h3",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}