{
  "abstract": "This Letter presents the first measurement of the $B^{0} \\to K^{+}π^{-}μ^{+}μ^{-}$ differential branching fraction in the region of the dihadron $K^+π^-$ mass, $m_{Kπ}$, $1000< m_{Kπ} < 1835\\,\\text{MeV}/c^{2}$. This decay mode is mediated by the quark-level transition $b \\to s\\ell^{+}\\ell^{-}$, for which the measured effective couplings show tensions with Standard Model predictions. The analysis is performed using proton-proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of $8.4\\,\\text{fb}^{-1}$. The differential branching fraction is determined across different regions of dimuon mass squared, $q^2$, in the interval $0.1 < q^2 < 18.0\\,\\text{GeV}^2/c^{4}$, as well as in different regions of $ m_{Kπ}$ in the interval $1.1 < q^2 < 6.0\\,\\text{GeV}^2/c^{4}$. The results represent the first differential measurement of the branching fraction across $m_{Kπ}$ within the selected dihadron-mass region, and the first observation of the decay within this region above the $J/ψ$ resonance.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.14156",
  "author_total": 1129,
  "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": "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": "L. An"
    },
    {
      "name": "L. Anderlini"
    },
    {
      "name": "M. Andersson"
    },
    {
      "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": "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"
    },
    {
      "name": "I. R. Barbosa"
    },
    {
      "name": "R. J. Barlow"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/c7zmbke1ep6f5.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.14156",
  "fulltext_url": null,
  "id": "c7zmbke1ep6f5",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.14156",
  "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"
    ],
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7221752381",
  "pdf_url": "https://arxiv.org/pdf/2610.14156",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/c7zmbke1ep6f5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2610.14156",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.14156"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Branching fraction measurement of the $B^0\\to K^+π^-μ^+μ^-$ decay at high dihadron mass",
  "title_text": "Branching fraction measurement of the B^0→ K^+π^-μ^+μ^- decay at high dihadron mass",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/c7zmbke1ep6f5",
  "venue": "arXiv",
  "versions": []
}