{
  "abstract": "A search for the Cabibbo-suppressed decay $Ξ_c^0 \\to pK^-$ is performed using $pp$ collision data corresponding to an integrated luminosity of $5.4\\,\\mathrm{fb}^{-1}$, collected by the LHCb experiment at a centre-of-mass energy of $13\\,\\mathrm{TeV}$. The decay is observed for the first time and its branching fraction measured to be $(4.5\\pm0.5\\pm0.2\\pm0.9)\\times10^{-5}$, where the uncertainties are statistical, systematic and from the branching fraction of the normalisation channel $Ξ_b^- \\to Ξ_c^0 (\\to p K^- K^- π^+) π^-$. Using the decay chain $Ξ_b^- \\to Ξ_c^0(\\to pK^-)π^-$, the decay asymmetry parameter of the $Ξ_c^0 \\to pK^-$ decay is determined to be $α_{Ξ_c^0}=0.32\\pm0.15\\pm0.01$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.27894",
  "author_total": 1182,
  "authors": [
    {
      "name": "LHCb collaboration"
    },
    {
      "name": "R. Aaij"
    },
    {
      "name": "M. Abdelfatah"
    },
    {
      "name": "A. S. W. Abdelmotteleb"
    },
    {
      "name": "C. Abellan Beteta"
    },
    {
      "name": "F. Abudinén"
    },
    {
      "name": "T. Ackernley"
    },
    {
      "name": "A. A. Adefisoye"
    },
    {
      "name": "B. Adeva"
    },
    {
      "name": "M. Adinolfi"
    },
    {
      "name": "P. Adlarson"
    },
    {
      "name": "C. Agapopoulou"
    },
    {
      "name": "C. A. Aidala"
    },
    {
      "name": "S. Akar"
    },
    {
      "name": "K. Akiba"
    },
    {
      "name": "H. Al Saleh"
    },
    {
      "name": "P. Albicocco"
    },
    {
      "name": "J. Albrecht"
    },
    {
      "name": "R. Aleksiejunas"
    },
    {
      "name": "F. Alessio"
    },
    {
      "name": "P. Alvarez Cartelle"
    },
    {
      "name": "S. Amato"
    },
    {
      "name": "J. L. Amey"
    },
    {
      "name": "Y. Amhis"
    },
    {
      "name": "Z. Amos"
    },
    {
      "name": "L. An"
    },
    {
      "name": "L. Anderlini"
    },
    {
      "name": "P. Andreola"
    },
    {
      "name": "M. Andreotti"
    },
    {
      "name": "S. Andres Estrada"
    },
    {
      "name": "A. Anelli"
    },
    {
      "name": "D. Ao"
    },
    {
      "name": "C. Arata"
    },
    {
      "name": "F. Archilli"
    },
    {
      "name": "Z. Areg"
    },
    {
      "name": "M. Argenton"
    },
    {
      "name": "S. Arguedas Cuendis"
    },
    {
      "name": "L. Arnone"
    },
    {
      "name": "M. Artuso"
    },
    {
      "name": "E. Aslanides"
    },
    {
      "name": "R. Ataíde Da Silva"
    },
    {
      "name": "M. Atzeni"
    },
    {
      "name": "B. Audurier"
    },
    {
      "name": "J. A. Authier"
    },
    {
      "name": "D. Bacher"
    },
    {
      "name": "I. Bachiller Perea"
    },
    {
      "name": "S. Bachmann"
    },
    {
      "name": "M. Bachmayer"
    },
    {
      "name": "J. J. Back"
    },
    {
      "name": "M. Bai"
    },
    {
      "name": "Z. B. Bai"
    },
    {
      "name": "V. Balagura"
    },
    {
      "name": "A. Balboni"
    },
    {
      "name": "W. Baldini"
    },
    {
      "name": "Z. Baldwin"
    },
    {
      "name": "L. Balzani"
    },
    {
      "name": "H. Bao"
    },
    {
      "name": "J. Baptista de Souza Leite"
    },
    {
      "name": "C. Barbero Pretel"
    },
    {
      "name": "M. Barbetti"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0t6qhgkwpj985.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.27894",
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  "id": "0t6qhgkwpj985",
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  "landing_url": "https://arxiv.org/abs/2608.27894",
  "language": "en",
  "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": [
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      "hep-ex"
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  "openalex": "W7204772365",
  "pdf_url": "https://arxiv.org/pdf/2608.27894",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0t6qhgkwpj985.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:22Z",
      "native_id": "2608.27894",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.27894"
    },
    {
      "first_seen": "2026-10-30T12:17:29Z",
      "native_id": "hal-05741412",
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  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Observation of the $Ξ_c^0 \\to pK^-$ decay and measurement of its decay asymmetry",
  "title_text": "Observation of the Ξ_c^0 → pK^- decay and measurement of its decay asymmetry",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:29Z",
  "url": "https://research.draconitic.com/paper/0t6qhgkwpj985",
  "venue": "arXiv",
  "versions": []
}