{
  "abstract": "We propose a Lorentz-covariant on-shell formalism for allowed nuclear beta decay. Nuclear matrix elements are organized in a systematic effective field theory expansion in the recoil momentum, with the dependence on nuclear spin and polarization encoded in little-group-covariant structures. In this language, we construct the most general standard and exotic currents for allowed transitions through first recoil order. We then derive the differential decay distribution encoded in a set of Lorentz-invariant form factors. Specializing to the rest frame of the parent nucleus, we relate our parameters to those used in the traditional beta-decay literature and in nucleon- and quark-level effective field theories. The formalism provides a natural framework for extensions to higher recoil orders, radiative corrections, and forbidden transitions.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.18062",
  "author_total": 2,
  "authors": [
    {
      "name": "Sergio Cruz-Alzaga"
    },
    {
      "name": "Adam Falkowski"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bpjr3ajyq6h1y.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.18062",
  "fulltext_url": null,
  "id": "bpjr3ajyq6h1y",
  "issns": [],
  "landing_url": "https://hal.science/hal-05842400v1",
  "language": "en",
  "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-ph"
    ],
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      "arxiv",
      "nucl-th"
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      "0.phys"
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      "hal",
      "1.phys.hphe"
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      "hal",
      "1.phys.nucl"
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    [
      "openalex",
      "3106|Nuclear physics research studies"
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  "openalex": "W7221795246",
  "pdf_url": "https://arxiv.org/pdf/2610.18062",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-13",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bpjr3ajyq6h1y.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:02Z",
      "native_id": "hal-05842400",
      "source": "hal",
      "url": "https://hal.science/hal-05842400v1"
    },
    {
      "first_seen": "2026-10-30T12:29:11Z",
      "native_id": "2610.18062",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.18062"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-th",
      "subfield": "nuclear"
    }
  ],
  "title": "Covariant approach to allowed beta decay",
  "title_text": "Covariant approach to allowed beta decay",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:11Z",
  "url": "https://research.draconitic.com/paper/bpjr3ajyq6h1y",
  "venue": "HAL",
  "versions": []
}