{
  "abstract": "We report a measurement of the azimuthal asymmetry of muons from the decay of coherently photoproduced J/$ψ$ mesons with respect to the second-order event plane in hadronic lead-lead (PbPb) collisions. The analysis is based on data collected by the CMS experiment at the LHC at a nucleon-nucleon center-of-mass energy of 5.36 TeV, corresponding to an integrated luminosity of 1.26 nb$^{-1}$. The asymmetry is quantified using the amplitude $A_{2}$ of the second-order harmonic modulation of the decay-muon azimuthal distribution. A negative $A_{2}$ = $-$0.194 $\\pm$ 0.022 (stat.) $\\pm$ 0.018 (syst.) is observed with a significance greater than five standard deviations for the first time. The $A_{2}$ values show no significant dependence on the J/$ψ$ meson rapidity or the degree of overlap of the colliding ions. A theoretical model in which the coherently photoproduced J/$ψ$ meson inherits the linear polarization of the incident photon is consistent with the data. When considered together with recent measurements of coherent $ρ^0$ $\\to$ $π^+π^-$ photoproduction in ultraperipheral collisions, these results provide a direct observation of spin dependence in the azimuthal asymmetry of decay products from coherently photoproduced vector mesons. In addition, the observed correlation with the event plane may enable a novel approach to reaction plane determination in the future.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.04376",
  "author_total": 2545,
  "authors": [
    {
      "name": "Andrey Belyaev"
    },
    {
      "name": "Arzunik Gevorgyan"
    },
    {
      "name": "Aram Hayrapetyan"
    },
    {
      "name": "Armen Tumasyan"
    },
    {
      "name": "Wolfgang Adam"
    },
    {
      "name": "Lisa Benato"
    },
    {
      "name": "Thomas Bergauer"
    },
    {
      "name": "Marko Dragicevic"
    },
    {
      "name": "Stefan Gundacker"
    },
    {
      "name": "Ali Kaan Guven"
    },
    {
      "name": "Priya Sajid Hussain"
    },
    {
      "name": "Manfred Jeitler"
    },
    {
      "name": "Natascha Krammer"
    },
    {
      "name": "Ang Li"
    },
    {
      "name": "Dietrich Liko"
    },
    {
      "name": "Mark Nicholas Matthewman"
    },
    {
      "name": "Andreas Pfeiffer"
    },
    {
      "name": "Jochen Schieck"
    },
    {
      "name": "Robert Schoefbeck"
    },
    {
      "name": "Maryam Shooshtari"
    },
    {
      "name": "Mangesh Sonawane"
    },
    {
      "name": "Niels van den Bossche"
    },
    {
      "name": "Wolfgang Waltenberger"
    },
    {
      "name": "Claudia Wulz"
    },
    {
      "name": "Tahys Janssen"
    },
    {
      "name": "Daniel Ocampo Henao"
    },
    {
      "name": "Thomas van Laer"
    },
    {
      "name": "Pierre van Mechelen"
    },
    {
      "name": "Donya Ahmadi"
    },
    {
      "name": "Jas Bierkens"
    },
    {
      "name": "Nordin Breugelmans"
    },
    {
      "name": "Soumya Dansana"
    },
    {
      "name": "Alexandre de Moor"
    },
    {
      "name": "Martin Delcourt"
    },
    {
      "name": "Stef Duponcheel"
    },
    {
      "name": "Chirayu Gupta"
    },
    {
      "name": "Felix Johannes Heyen"
    },
    {
      "name": "Yanwen Hong"
    },
    {
      "name": "Kai Kang"
    },
    {
      "name": "Pavlo Kashko"
    },
    {
      "name": "Steven Lowette"
    },
    {
      "name": "Inna Makarenko"
    },
    {
      "name": "Saranya Nandakumar"
    },
    {
      "name": "Jeremi Niedziela"
    },
    {
      "name": "Stefaan Tavernier"
    },
    {
      "name": "Michael Tytgat"
    },
    {
      "name": "Gerrit van Onsem"
    },
    {
      "name": "Senne van Putte"
    },
    {
      "name": "Tiepolo Wybouw"
    },
    {
      "name": "Aya Beshr"
    },
    {
      "name": "Bugra Bilin"
    },
    {
      "name": "Franco Caviglia Roman"
    },
    {
      "name": "Barbara Clerbaux"
    },
    {
      "name": "Aloke Kumar Das"
    },
    {
      "name": "Isabelle de Bruyn"
    },
    {
      "name": "Gilles de Lentdecker"
    },
    {
      "name": "Eliott Ducarme"
    },
    {
      "name": "Hugues Evard"
    },
    {
      "name": "Laurent Favart"
    },
    {
      "name": "Ilia Kalaitzidou"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bh7pcy3c0zaxg.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.04376",
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  "language": "en",
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  "licence_label": "CC BY 4.0",
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  "pdf_url": "https://arxiv.org/pdf/2609.04376",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bh7pcy3c0zaxg.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:37Z",
      "native_id": "hal-05759122",
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      "native_id": "2609.04376",
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      "url": "https://arxiv.org/abs/2609.04376"
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  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
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    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
    }
  ],
  "title": "Spin-dependent azimuthal asymmetry of coherent J/$ψ$ photoproduction in hadronic PbPb collisions at $\\sqrt{s_\\mathrm{NN}}$ = 5.36 TeV",
  "title_text": "Spin-dependent azimuthal asymmetry of coherent J/ψ photoproduction in hadronic PbPb collisions at √(s_NN) = 5.36 TeV",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:14Z",
  "url": "https://research.draconitic.com/paper/bh7pcy3c0zaxg",
  "venue": "HAL",
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