{
  "abstract": "The first experimental study of the dead-cone effect for the charm quark in heavy ion collisions is presented. The analysis is based on a sample of lead-lead (PbPb) collisions at a center-of-mass energy per nucleon pair of 5.02 TeV, recorded by the CMS experiment at the CERN LHC in 2018 and corresponding to an integrated luminosity of 1.7 nb$^{-1}$. The studied observable is the angular distribution of hard, collinear intrajet emissions that are selected with the late-$k_\\mathrm{T}$ grooming algorithm. The analysis is performed using inclusive jets and a sample of jets containing prompt D$^0$ mesons. The angular distribution of late-$k_\\mathrm{T}$ emissions in PbPb collisions is found to be shifted towards larger angles in D$^0$ jets relative to inclusive jets, indicating a suppression of collinear splittings for D$^0$ jets. This shift, which is expected from the dead-cone effect, is consistent with a similar observation made in proton-proton collisions. The new measurement disfavors hypotheses that predict a filling of the charm-quark dead cone by medium-induced radiation in heavy ion collisions.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.01285",
  "author_total": 1,
  "authors": [
    {
      "name": "CMS Collaboration"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8r1nst76ctf0r.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.01285",
  "fulltext_url": null,
  "id": "8r1nst76ctf0r",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.01285",
  "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/2611.01285",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8r1nst76ctf0r.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T12:20:59Z",
      "native_id": "2611.01285",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.01285"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
    }
  ],
  "title": "Probing the charm-quark dead cone effect in heavy ion collisions",
  "title_text": "Probing the charm-quark dead cone effect in heavy ion collisions",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:18Z",
  "url": "https://research.draconitic.com/paper/8r1nst76ctf0r",
  "venue": "arXiv",
  "versions": []
}