{
  "abstract": "Production of prompt P-wave charmonium states $χ_\\mathrm{c1}$(1P) and $χ_\\mathrm{c2}$(1P) is studied in proton-lead (pPb) collisions at a center-of-mass energy per nucleon pair of $\\sqrt{\\smash[b]{s_{_{\\mathrm{NN}}}}}$ = 8.16 TeV. The analysis is based on data corresponding to an integrated luminosity of 175 nb$^{-1}$ collected by the CMS experiment at the CERN LHC. The $χ_\\mathrm{c}$ states are measured via their decay $χ_\\mathrm{c}$ $\\to$ J$/ψ\\,γ$. The J$/ψ$ meson is reconstructed via its decay to a muon pair, while the photon is reconstructed through its conversion to an electron-positron pair. The ratio of production cross sections times branching fractions for the two charmonium states, [$σ(χ_\\mathrm{c2}) \\mathcal{B}(χ_\\mathrm{c2}$ $\\to$ J$/ψ\\, γ$)] / [$σ(χ_\\mathrm{c1}) \\mathcal{B}(χ_\\mathrm{c1}$ $\\to$ J$/ψ\\, γ)$], is reported in the rapidity range $\\vert y($J$/ψ)\\vert$ $\\lt$ 2.4 for the transverse momentum range 6.5 $\\lt$ $p_{\\mathrm{T}}$(J$/ψ$) $\\lt$ 30 GeV. The $χ_\\mathrm{c2}$-to-$χ_\\mathrm{c1}$ ratio is found to be independent of event charged-particle multiplicity, as well as of the rapidity and $p_\\mathrm{T}$ of the J$/ψ$. The consistency of this ratio with proton-proton measurements at $\\sqrt{s}$ = 7 TeV indicates an absence of strong relative modification for $χ_\\mathrm{c}$ states in pPb collisions, in contrast to the behavior observed in the $ψ$(2S)-to-J$/ψ$ ratio.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2607.17847",
  "author_total": 1,
  "authors": [
    {
      "name": "CMS Collaboration"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5bbn2pz8hem7p.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.17847",
  "fulltext_url": null,
  "id": "5bbn2pz8hem7p",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.17847",
  "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-ex"
    ],
    [
      "arxiv",
      "nucl-ex"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2607.17847",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5bbn2pz8hem7p.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:01Z",
      "native_id": "2607.17847",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.17847"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
    }
  ],
  "title": "Study of $χ_{\\mathrm{c}}$ production in pPb collisions at $\\sqrt{s_{\\mathrm{NN}}}$ = 8.16 TeV",
  "title_text": "Study of χ_c production in pPb collisions at √(s_NN) = 8.16 TeV",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:01Z",
  "url": "https://research.draconitic.com/paper/5bbn2pz8hem7p",
  "venue": "arXiv",
  "versions": []
}