{
  "abstract": "Ultra-peripheral heavy-ion collisions (UPCs) coherently photo-produce vector mesons through two spatially separated and quantum-mechanically indistinguishable production sites, whose separation far exceeds the lifetime of the created resonance. The superposition of these amplitudes generates production-site entanglement, observed experimentally as entanglement-enabled spin-interference patterns in the angular distributions of the decay products. We show that these interference signatures provide a sensitive probe of spin-alignment transfer in hadronic decay chains, enabling intermediate-state quantum numbers and relative branching ratios to be measured from observed angular modulations. Using the decay $ρ(1450)\\!\\rightarrow\\!π^{+}π^{-}π^{+}π^{-}$ as example, we simulate the $a_{1}(1260)π$, $h_{1}(1170)π$, $ρ(ππ)_{S}$, and $π(1300)π$ channels and demonstrate that each produces a distinct azimuthal $\\cos 2ϕ$ modulation. The $π(1300)π$ mode shows a uniquely separated response, allowing its branching fraction to be extracted directly. These results establish production-site entanglement in UPCs as a selective tool for hadron spectroscopy, particularly for broad or overlapping resonances that are otherwise difficult to disentangle.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.05691",
  "author_total": 3,
  "authors": [
    {
      "name": "Di Zhang"
    },
    {
      "name": "Zhangbu Xu"
    },
    {
      "name": "Chi Yang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0pwt6128nfedf.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.05691",
  "fulltext_url": null,
  "id": "0pwt6128nfedf",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.05691",
  "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": "W7163676063",
  "pdf_url": "https://arxiv.org/pdf/2606.05691",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0pwt6128nfedf.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:41Z",
      "native_id": "2606.05691",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.05691"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Probing Quantum Numbers and Decay Branching Ratios of Exotic States via Entanglement-Enabled Spin Interference",
  "title_text": "Probing Quantum Numbers and Decay Branching Ratios of Exotic States via Entanglement-Enabled Spin Interference",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:41Z",
  "url": "https://research.draconitic.com/paper/0pwt6128nfedf",
  "venue": "arXiv",
  "versions": []
}