{
  "abstract": "Available data on the $X(3872)$ lineshape have been fitted with a Flattè parametrization derived from an effective Lagrangian in which $X$, $D$, and $D^*$ are all elementary fields. A molecular $X$, i.e., a deuteron-like bound state of $D$ and $\\bar{D}^*$, must instead be described by an effective theory where the $X$ field is initially absent or introduced as an auxiliary, unphysical, field, yielding a lineshape parametrization that differs significantly from the Flattè one. We demonstrate, in the analogous theory of nucleons with an auxiliary deuteron field, that this parametrization gives a fully consistent description of $np\\to\\text{deuteron}\\to np$ scattering data, and motivate applying the same method to the $X$ lineshape. The analysis proposed here is novel and has not previously been carried out on the available data.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2605.12274",
  "author_total": 5,
  "authors": [
    {
      "name": "A. Carducci"
    },
    {
      "name": "G. Cianti"
    },
    {
      "name": "P. D'Annibali"
    },
    {
      "name": "D. Germani"
    },
    {
      "name": "A. D. Polosa"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/d2w6eep0a4t4k.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.12274",
  "fulltext_url": null,
  "id": "d2w6eep0a4t4k",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2605.12274",
  "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|Quantum Chromodynamics and Particle Interactions"
    ]
  ],
  "openalex": "W7161046132",
  "pdf_url": "https://arxiv.org/pdf/2605.12274",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/d2w6eep0a4t4k.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:32Z",
      "native_id": "2605.12274",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.12274"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "A New Look at the X Compositeness from its Lineshape",
  "title_text": "A New Look at the X Compositeness from its Lineshape",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:28Z",
  "url": "https://research.draconitic.com/paper/d2w6eep0a4t4k",
  "venue": "arXiv",
  "versions": []
}