{
  "abstract": "We develop a systematic correspondence between massless contact amplitudes in an unbroken theory and massive contact amplitudes after spontaneous symmetry breaking. Our construction employs the spin-transversality (ST) massive amplitude basis, with the systematic high energy expansion through minimal-helicity-chirality (MHC) amplitudes. The resulting $U(2)=SU(2)\\times U(1)_t$ description of a massive particle makes the semi-standard Young-tableau construction of massless Lorentz structures directly applicable to massive amplitudes. When the leading-order MHC component has a massless contact limit, it is one-to-one matched directly to its UV amplitude. Otherwise, five exceptional classes of ST amplitudes are identified, their first non-zero descendant components are matched through conserved current couplings to the massless contact amplitude. We apply the framework to the one-flavor electroweak sector of the Standard Model Effective Field Theory (SMEFT) through dimension eight, obtaining explicit relations between unbroken-phase Wilson coefficients and broken-phase ST amplitude coefficients for amplitudes with three to eight external particles.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.11767",
  "author_total": 5,
  "authors": [
    {
      "name": "Yu-Han Ni"
    },
    {
      "name": "Hao Sun"
    },
    {
      "name": "Yi-Ning Wang"
    },
    {
      "name": "Chao Wu"
    },
    {
      "name": "Jiang-Hao Yu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2n2jfnde9dmqs.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.11767",
  "fulltext_url": null,
  "id": "2n2jfnde9dmqs",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.11767",
  "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-ph"
    ],
    [
      "arxiv",
      "hep-th"
    ],
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7212243245",
  "pdf_url": "https://arxiv.org/pdf/2609.11767",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-10",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2n2jfnde9dmqs.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:20:26Z",
      "native_id": "2609.11767",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.11767"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Massless-Massive Amplitude Correspondence III: Massive Amplitude Bases in the SMEFT",
  "title_text": "Massless-Massive Amplitude Correspondence III: Massive Amplitude Bases in the SMEFT",
  "type": "preprint",
  "updated_at": "2026-10-30T12:20:26Z",
  "url": "https://research.draconitic.com/paper/2n2jfnde9dmqs",
  "venue": "arXiv",
  "versions": []
}