{
  "abstract": "The rare decay ${Ξ_b^-\\toΞ^-μ^+μ^-}$ is observed for the first time using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of $7$, $8$ and~$13~\\text{TeV}$, corresponding to integrated luminosities of $1$, $2$ and $6~\\text{fb}^{-1}$, respectively. Its branching fraction is reported in intervals of the dimuon invariant mass squared. The integrated value of ${\\cal{B}}(Ξ_b^-\\toΞ^-μ^+μ^-)$ is measured to be ${ (118 \\pm 24 \\pm 7 \\pm 38 ) \\times 10^{-8}}$, where the first uncertainty is statistical, the second is systematic and the third uncertainty arises from the normalisation branching fraction ${\\cal{B}}(Ξ_b^-\\toΞ^-J/ψ)$, whose uncertainty is dominated by SU(3)-breaking effects. In addition, the ratio of the branching fractions of the ${Ξ_b^-\\toΞ^-ψ(2S)}$ and the ${Ξ_b^-\\toΞ^-J/ψ}$ decays is measured to be ${ 0.491 \\pm 0.041 \\pm 0.019 }$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.22452",
  "author_total": 1191,
  "authors": [
    {
      "name": "Roel Aaij"
    },
    {
      "name": "Mohammed Abdelfatah"
    },
    {
      "name": "Ahmed Sameh Wagih Abdelmotteleb"
    },
    {
      "name": "Carlos Abellan Beteta"
    },
    {
      "name": "Fernando Jesus Abudinén"
    },
    {
      "name": "Thomas Ackernley"
    },
    {
      "name": "Ayomide Matthew Adefisoye"
    },
    {
      "name": "Bernardo Adeva"
    },
    {
      "name": "Marco Adinolfi"
    },
    {
      "name": "Patrik Harri Adlarson"
    },
    {
      "name": "Christina Agapopoulou"
    },
    {
      "name": "Christine Angela Aidala"
    },
    {
      "name": "Simon Akar"
    },
    {
      "name": "Kazuyoshi Akiba"
    },
    {
      "name": "Hussain Hassan A Al Saleh"
    },
    {
      "name": "Pietro Albicocco"
    },
    {
      "name": "Johannes Albrecht"
    },
    {
      "name": "Ramunas Aleksiejunas"
    },
    {
      "name": "Federico Alessio"
    },
    {
      "name": "Paula Alvarez Cartelle"
    },
    {
      "name": "Antonio Augusto Alves"
    },
    {
      "name": "Sandra Amato"
    },
    {
      "name": "Jake Lewis Amey"
    },
    {
      "name": "Yasmine Amhis"
    },
    {
      "name": "Zachariah Benjamin Amos"
    },
    {
      "name": "Liupan An"
    },
    {
      "name": "Lucio Anderlini"
    },
    {
      "name": "Pasquale Andreola"
    },
    {
      "name": "Mirco Andreotti"
    },
    {
      "name": "Sergio Andres Estrada"
    },
    {
      "name": "Alessia Anelli"
    },
    {
      "name": "Dong Ao"
    },
    {
      "name": "Carolina Arata"
    },
    {
      "name": "Flavio Archilli"
    },
    {
      "name": "Zaratsyan Areg"
    },
    {
      "name": "Matteo Argenton"
    },
    {
      "name": "Sergio Arguedas Cuendis"
    },
    {
      "name": "Lisa Arnone"
    },
    {
      "name": "Marina Artuso"
    },
    {
      "name": "Elie Aslanides"
    },
    {
      "name": "Rita Ataíde da Silva"
    },
    {
      "name": "Michele Atzeni"
    },
    {
      "name": "Benjamin Audurier"
    },
    {
      "name": "Juliette Authier"
    },
    {
      "name": "David Bacher"
    },
    {
      "name": "Irene Bachiller Perea"
    },
    {
      "name": "Sebastian Bachmann"
    },
    {
      "name": "Marie Bachmayer"
    },
    {
      "name": "John Back"
    },
    {
      "name": "Maoze Bai"
    },
    {
      "name": "Ziyu Bai"
    },
    {
      "name": "Vladislav Balagura"
    },
    {
      "name": "Anna Balboni"
    },
    {
      "name": "Wander Baldini"
    },
    {
      "name": "Zachary Baldwin"
    },
    {
      "name": "Luca Balzani"
    },
    {
      "name": "Haoran Bao"
    },
    {
      "name": "Juan Baptista de Souza Leite"
    },
    {
      "name": "Carlos Javier Barbero Pretel"
    },
    {
      "name": "Ivanildo Rui Barbosa"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3y4j52za7rmrp.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.22452",
  "fulltext_url": null,
  "id": "3y4j52za7rmrp",
  "issns": [],
  "landing_url": "https://hal.science/hal-05842471v1",
  "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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      "arxiv",
      "hep-ex"
    ],
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      "0.phys"
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    ],
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      "openalex",
      "3106|Particle physics theoretical and experimental studies"
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  "openalex": "W7222934958",
  "pdf_url": "https://arxiv.org/pdf/2610.22452",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3y4j52za7rmrp.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:02Z",
      "native_id": "hal-05842471",
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      "url": "https://hal.science/hal-05842471v1"
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      "first_seen": "2026-10-30T12:30:32Z",
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      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.22452"
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  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Observation of the ${Ξ_b^-\\to Ξ^-μ^+μ^-}$ and study of the ${Ξ_b^-\\toΞ^-ψ(2S)}$ decays",
  "title_text": "Observation of the Ξ_b^-→ Ξ^-μ^+μ^- and study of the Ξ_b^-→Ξ^-ψ(2S) decays",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:28Z",
  "url": "https://research.draconitic.com/paper/3y4j52za7rmrp",
  "venue": "HAL",
  "versions": []
}