{
  "abstract": "We report a search for the rare decay B^{+}→K^{+}τ^{+}τ^{-} using 1.2×10^{9} ϒ(4S) mesons produced near threshold in electron-positron collisions and collected by the Belle and Belle II experiments. We fully reconstruct the hadronic decay of one B meson produced in the ϒ(4S)→B^{+}B^{-} decay, and search for B^{±}→K^{±}τ^{+}τ^{-} candidates among the remaining collision products, reconstructing a charged kaon and leptonic decays of the τ leptons. We optimize the selection for best sensitivity and look for an excess over background at low values of the residual energy detected in the calorimeter after full event reconstruction. We observe no significant excess and set the limit B(B^{+}→K^{+}τ^{+}τ^{-})<0.56×10^{-3} at the 90% confidence level, improving on the only previous result by a factor of four.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2603.24437",
  "author_total": 436,
  "authors": [
    {
      "name": "Merna Abumusabh"
    },
    {
      "name": "Ichiro Adachi"
    },
    {
      "name": "Karol Mateusz Adamczyk"
    },
    {
      "name": "Agrim Aggarwal"
    },
    {
      "name": "Latika Aggarwal"
    },
    {
      "name": "Hossain Ahmed"
    },
    {
      "name": "Yongheon Ahn"
    },
    {
      "name": "Hiroaki Aihara"
    },
    {
      "name": "Norayr Akopov"
    },
    {
      "name": "Saleh Alghamdi"
    },
    {
      "name": "Mohammad Hasan Alhakami"
    },
    {
      "name": "Alberto Aloisio"
    },
    {
      "name": "Numa Althubiti"
    },
    {
      "name": "Kieran Amos"
    },
    {
      "name": "Martin Angelsmark"
    },
    {
      "name": "Anh-Ky Nguyen"
    },
    {
      "name": "Cecilia Antonioli"
    },
    {
      "name": "David Mark Asner"
    },
    {
      "name": "Hulya Atmacan"
    },
    {
      "name": "Tagir Aushev"
    },
    {
      "name": "Rachid Ayad"
    },
    {
      "name": "Varghese Babu"
    },
    {
      "name": "Hanwook Bae"
    },
    {
      "name": "Naveen Kumar Baghel"
    },
    {
      "name": "Seema Bahinipati"
    },
    {
      "name": "Philip Bambade"
    },
    {
      "name": "Swagato Banerjee"
    },
    {
      "name": "Matthew Barrett"
    },
    {
      "name": "Martin Bartl"
    },
    {
      "name": "Jerome Baudot"
    },
    {
      "name": "Anselm Baur"
    },
    {
      "name": "Alexandre Beaubien"
    },
    {
      "name": "Fabian Horst Becherer"
    },
    {
      "name": "Juergen Becker"
    },
    {
      "name": "Jake Bennett"
    },
    {
      "name": "Florian Bernlochner"
    },
    {
      "name": "Valerio Bertacchi"
    },
    {
      "name": "Michel Bertemes"
    },
    {
      "name": "Emilie Bertholet"
    },
    {
      "name": "Martin Bessner"
    },
    {
      "name": "Stefano Bettarini"
    },
    {
      "name": "Vishal Bhardwaj"
    },
    {
      "name": "Fabrizio Bianchi"
    },
    {
      "name": "Tadeas Bilka"
    },
    {
      "name": "Diptaparna Biswas"
    },
    {
      "name": "Alexander Bobrov"
    },
    {
      "name": "Denis Bodrov"
    },
    {
      "name": "Alexander E Bondar"
    },
    {
      "name": "Giovanni Bonvicini"
    },
    {
      "name": "Jyotirmoi Borah"
    },
    {
      "name": "Alessandro Boschetti"
    },
    {
      "name": "Andrzej Bozek"
    },
    {
      "name": "Marko Bracko"
    },
    {
      "name": "Paolo Branchini"
    },
    {
      "name": "Roy Briere"
    },
    {
      "name": "Thomas Earl Browder"
    },
    {
      "name": "Antonio Budano"
    },
    {
      "name": "Severino Bussino"
    },
    {
      "name": "Quinn Campagna"
    },
    {
      "name": "Marcello Campajola"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3w97xjtfs5dxm.bib",
  "cited_by": 0,
  "doi": "10.1103/12f4-z51q",
  "fulltext_url": null,
  "id": "3w97xjtfs5dxm",
  "issns": [],
  "landing_url": "https://hal.science/hal-05735460v1",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.hexp"
    ],
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7165043177",
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3w97xjtfs5dxm.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:24Z",
      "native_id": "hal-05735460",
      "source": "hal",
      "url": "https://hal.science/hal-05735460v1"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "hal:1.phys.hexp",
      "subfield": "high-energy"
    }
  ],
  "title": "Search for the Decay B+→K+τ+τ- Using Data from the Belle and Belle II Experiments",
  "title_text": "Search for the Decay B+→K+τ+τ- Using Data from the Belle and Belle II Experiments",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:24Z",
  "url": "https://research.draconitic.com/paper/3w97xjtfs5dxm",
  "venue": "Phys.Rev.Lett.",
  "versions": []
}