{
  "abstract": "We investigate whether photon-induced production in ultraperipheral heavy-ion collisions and at the EIC can provide a new environment to search for the scalar $D \\bar{D}$ molecular candidate usually denoted as $X(3700)$. We calculate the tree-level amplitudes for $γγ\\to D^+ D^-$ and $γγ\\to D^0 \\bar{D^0}$, dress the outgoing pair with a coupled-channel Bethe-Salpeter interaction in the $(D^+ D^- , D^0 \\bar{D^0})$ basis, and convolute the resulting subprocess cross sections with equivalent-photon spectra. In the adopted two-channel scenario the analytic continuation of the $T$-matrix gives a bound state at $M_X=3.7162$~GeV, which is below the $D^0 \\bar{D^0}$ threshold. As a consequence of this, the observed signal in the continuum is not simply an isolated narrow peak, and a characteristic near-threshold line-shape distortion is produced: around $3.70 \\leq W \\leq 3.85$~GeV the integrated dressed-to-bare ratios are $(13.71,0.35)$ in Pb-Pb UPCs and $(13.74,0.35)$ in $e$-Au collisions for $(D^+D^-,D^0 \\bar{D^0})$. Using the BABAR-fitted central normalization $K_{\\rm dressed}=0.382$, the corresponding dressed cross sections are $(24.6,14.6)~μ{\\rm b}$ in Pb-Pb UPCs and $(2.41,1.43)~\\rm nb$ at the EIC. The charged-to-neutral ratios are directly accessible observables, whereas the dressed-to-bare ratios provide theoretical diagnostics of the final-state interaction. The near-threshold features are controlled by the common $γγ\\to D\\bar{D}$ dynamics and are rather independent of the external photon source.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2607.12224",
  "author_total": 4,
  "authors": [
    {
      "name": "F. C. Sobrinho"
    },
    {
      "name": "F. S. Navarra"
    },
    {
      "name": "K. P. Khemchandani"
    },
    {
      "name": "A. Martínez Torres"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/d556rybt5phhk.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.12224",
  "fulltext_url": null,
  "id": "d556rybt5phhk",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.12224",
  "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"
    ],
    [
      "openalex",
      "3106|Quantum Chromodynamics and Particle Interactions"
    ]
  ],
  "openalex": "W7168390263",
  "pdf_url": "https://arxiv.org/pdf/2607.12224",
  "pmcid": null,
  "pmid": null,
  "published": "2026-07-13",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/d556rybt5phhk.ris",
  "sources": [
    {
      "first_seen": "2026-11-02T12:21:15Z",
      "native_id": "2607.12224",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.12224"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Probing the X(3700) through two-photon $D \\bar{D}$ production in ultraperipheral collisions and at the EIC",
  "title_text": "Probing the X(3700) through two-photon D D̅ production in ultraperipheral collisions and at the EIC",
  "type": "preprint",
  "updated_at": "2026-11-04T15:20:50Z",
  "url": "https://research.draconitic.com/paper/d556rybt5phhk",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/w6qz-cckc",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}