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Search for lepton-number-violating B−→D(*)+μ−μ− decays

R. Aaij38, A. S. W. Abdelmotteleb57, C. Abellan Beteta51, F. Abudinén57, T. Ackernley61, A. A. Adefisoye69, B. Adeva47, M. Adinolfi55, P. Adlarson85 et al. (LHCb Collaboration)

P. Adlarson85, C. Agapopoulou14, C. A. Aidala87, Z. Ajaltouni11, S. Akar11, K. Akiba38, M. Akthar40, P. Albicocco28, J. Albrecht19,b, R. Aleksiejunas80, F. Alessio49, P. Alvarez Cartelle56, R. Amalric16, S. Amato3, J. L. Amey55, Y. Amhis14, L. An6, L. Anderlini27, M. Andersson51, P. Andreola51, M. Andreotti26, S. Andres Estrada84, A. Anelli31,49,c, D. Ao7, C. Arata12, F. Archilli37,d, Z. Areg69, M. Argenton26, S. Arguedas Cuendis9,49, L. Arnone31,c, A. Artamonov44, M. Artuso69, E. Aslanides13, R. Ataíde Da Silva50, M. Atzeni65, B. Audurier12, J. A. Authier15, D. Bacher64, I. Bachiller Perea50, S. Bachmann22, M. Bachmayer50, J. J. Back57, P. Baladron Rodriguez47, V. Balagura15, A. Balboni26, W. Baldini26, Z. Baldwin78, L. Balzani19, H. Bao7, J. Baptista de Souza Leite2, C. Barbero Pretel47,12, M. Barbetti27, I. R. Barbosa70, R. J. Barlow63, M. Barnyakov25, S. Barsuk14, W. Barter59, J. Bartz69, S. Bashir40, B. Batsukh5, P. B. Battista14, A. Bay50, A. Beck65, M. Becker19, F. 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Zhu8, Y. Zhu17, V. Zhukov17, J. Zhuo48, Q. Zou5,7, D. Zuliani33,v, and G. Zunica28 (LHCb Collaboration)

  • 1School of Physics and Astronomy, Monash University, Melbourne, Australia
  • 2Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
  • 3Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
  • 4Department of Engineering Physics, Tsinghua University, Beijing, China
  • 5Institute Of High Energy Physics (IHEP), Beijing, China
  • 6School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
  • 7University of Chinese Academy of Sciences, Beijing, China
  • 8Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
  • 9Consejo Nacional de Rectores (CONARE), San Jose, Costa Rica
  • 10Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France
  • 11Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
  • 12Université Paris-Saclay, Centre d’Etudes de Saclay (CEA), IRFU, Gif-Sur-Yvette, France
  • 13Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
  • 14Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • 15Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
  • 16Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Sorbonne Université, CNRS/IN2P3, Paris, France
  • 17I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
  • 18Universität Bonn—Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany
  • 19Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
  • 20Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
  • 21Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
  • 22Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
  • 23School of Physics, University College Dublin, Dublin, Ireland
  • 24INFN Sezione di Bari, Bari, Italy
  • 25INFN Sezione di Bologna, Bologna, Italy
  • 26INFN Sezione di Ferrara, Ferrara, Italy
  • 27INFN Sezione di Firenze, Firenze, Italy
  • 28INFN Laboratori Nazionali di Frascati, Frascati, Italy
  • 29INFN Sezione di Genova, Genova, Italy
  • 30INFN Sezione di Milano, Milano, Italy
  • 31INFN Sezione di Milano-Bicocca, Milano, Italy
  • 32INFN Sezione di Cagliari, Monserrato, Italy
  • 33INFN Sezione di Padova, Padova, Italy
  • 34INFN Sezione di Perugia, Perugia, Italy
  • 35INFN Sezione di Pisa, Pisa, Italy
  • 36INFN Sezione di Roma La Sapienza, Roma, Italy
  • 37INFN Sezione di Roma Tor Vergata, Roma, Italy
  • 38Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands
  • 39Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands
  • 40AGH—University of Krakow, Faculty of Physics and Applied Computer Science, Kraków, Poland
  • 41Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
  • 42National Center for Nuclear Research (NCBJ), Warsaw, Poland
  • 43Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
  • 44Authors affiliated with an institute formerly covered by a cooperation agreement with CERN
  • 45ICCUB, Universitat de Barcelona, Barcelona, Spain
  • 46La Salle, Universitat Ramon Llull, Barcelona, Spain
  • 47Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
  • 48Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia—CSIC, Valencia, Spain
  • 49European Organization for Nuclear Research (CERN), Geneva, Switzerland
  • 50Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
  • 51Physik-Institut, Universität Zürich, Zürich, Switzerland
  • 52NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
  • 53Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
  • 54School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
  • 55H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
  • 56Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
  • 57Department of Physics, University of Warwick, Coventry, United Kingdom
  • 58STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
  • 59School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
  • 60School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
  • 61Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
  • 62Imperial College London, London, United Kingdom
  • 63Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
  • 64Department of Physics, University of Oxford, Oxford, United Kingdom
  • 65Massachusetts Institute of Technology, Cambridge, MA, United States
  • 66University of Cincinnati, Cincinnati, OH, United States
  • 67University of Maryland, College Park, MD, United States
  • 68Los Alamos National Laboratory (LANL), Los Alamos, NM, United States
  • 69Syracuse University, Syracuse, NY, United States
  • 70Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil (associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil)
  • 71Universidad Andres Bello, Santiago, Chile (associated with Physik-Institut, Universität Zürich, Zürich, Switzerland)
  • 72School of Physics and Electronics, Hunan University, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
  • 73State Key Laboratory of Nuclear Physics and Technology, South China Normal University, Guangzhou, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
  • 74Lanzhou University, Lanzhou, China (associated with Institute Of High Energy Physics (IHEP), Beijing, China)
  • 75School of Physics and Technology, Wuhan University, Wuhan, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
  • 76Henan Normal University, Xinxiang, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
  • 77Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Sorbonne Université, CNRS/IN2P3, Paris, France)
  • 78Ruhr Universitaet Bochum, Fakultaet f. Physik und Astronomie, Bochum, Germany (associated with Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany)
  • 79Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland)
  • 80Faculty of Physics, Vilnius University, Vilnius, Lithuania (associated with Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany)
  • 81Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
  • 82Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
  • 83Tadeusz Kosciuszko Cracow University of Technology, Cracow, Poland (associated with Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland)
  • 84Universidade da Coruña, A Coruña, Spain (associated with La Salle, Universitat Ramon Llull, Barcelona, Spain)
  • 85Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom)
  • 86Taras Schevchenko University of Kyiv, Faculty of Physics, Kyiv, Ukraine (associated with Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France)
  • 87University of Michigan, Ann Arbor, MI, United States (associated with Syracuse University, Syracuse, NY, United States)
  • 88Ohio State University, Columbus, United States (associated with Los Alamos National Laboratory (LANL), Los Alamos, NM, United States)

  • *Full author list given at the end of the article.
  • aDeceased.
  • bAlso at Lamarr Institute for Machine Learning and Artificial Intelligence, Dortmund, Germany.
  • cAlso at Università degli Studi di Milano-Bicocca, Milano, Italy.
  • dAlso at Università di Roma Tor Vergata, Roma, Italy.
  • eAlso at Università di Modena e Reggio Emilia, Modena, Italy.
  • fAlso at Department of Physics and Astronomy, University of Victoria, Victoria, Canada.
  • gAlso at Università di Ferrara, Ferrara, Italy.
  • hAlso at Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil.
  • iAlso at Università di Bologna, Bologna, Italy.
  • jAlso at Università di Genova, Genova, Italy.
  • kAlso at Scuola Normale Superiore, Pisa, Italy.
  • lAlso at Università degli Studi di Milano, Milano, Italy.
  • mAlso at Center for High Energy Physics, Tsinghua University, Beijing, China.
  • nAlso at Universidad Nacional Autónoma de Honduras, Tegucigalpa, Honduras.
  • oAlso at Università di Cagliari, Cagliari, Italy.
  • pAlso at Centro Federal de Educacão Tecnológica Celso Suckow da Fonseca, Rio De Janeiro, Brazil.
  • qAlso at Università di Bari, Bari, Italy.
  • rAlso at Università di Perugia, Perugia, Italy.
  • sAlso at LIP6, Sorbonne Université, Paris, France.
  • tAlso at Università di Pisa, Pisa, Italy.
  • uAlso at Hangzhou Institute for Advanced Study, UCAS, Hangzhou, China.
  • vAlso at Università di Padova, Padova, Italy.
  • wAlso at Università di Bergamo, Bergamo, Italy.
  • xAlso at Universidad de Ingeniería y Tecnología (UTEC), Lima, Peru.
  • yAlso at Università di Siena, Siena, Italy.
  • zAlso at Università della Basilicata, Potenza, Italy.
  • aaAlso at Universidad de Alcalá, Alcalá de Henares, Spain.
  • bbAlso at Università di Urbino, Urbino, Italy.

Phys. Rev. D 113, 092006 – Published 12 May, 2026

DOI: https://doi.org/10.1103/r27c-9ghw

Abstract

A search is performed for lepton-number-violating B−→D(*)+μ−μ− decays, using data collected by the LHCb experiment in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4  fb−1. No significant signal is observed, and upper limits are set on the branching fractions, B(B−→D+μ−μ−)<4.6×10−8 and B(B−→D*+μ−μ−)<5.9×10−8, at the 95% confidence level.

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