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Comprehensive Analysis of the B0K*0μ+μ Decay

R. Aaij38, A. S. W. Abdelmotteleb58, C. Abellan Beteta52, F. Abudinén58, T. Ackernley62, A. A. Adefisoye70, B. Adeva48, M. Adinolfi56, P. Adlarson86 et al. (LHCb Collaboration)

P. Adlarson86, C. Agapopoulou14, C. A. Aidala88, Z. Ajaltouni11, S. Akar11, K. Akiba38, M. Akthar40, P. Albicocco28, J. Albrecht19,d, R. Aleksiejunas82, F. Alessio50, P. Alvarez Cartelle57, R. Amalric16, S. Amato3, J. L. Amey56, Y. Amhis14, L. An6, L. Anderlini27, M. Andersson52, P. Andreola52, M. Andreotti26, S. Andres Estrada45, A. Anelli31,50,e, D. Ao7, C. Arata12, F. Archilli37,f, Z. Areg70, M. Argenton26, S. Arguedas Cuendis9,50, L. Arnone31,e, A. Artamonov44, M. Artuso70, E. Aslanides13, R. Ataíde Da Silva51, M. Atzeni66, B. Audurier12, J. A. Authier15, D. Bacher65, I. Bachiller Perea51, S. Bachmann22, M. Bachmayer51, J. J. Back58, P. Baladron Rodriguez48, V. Balagura15, A. Balboni26, W. Baldini26, Z. Baldwin80, L. Balzani19, H. Bao7, J. Baptista de Souza Leite2, C. Barbero Pretel48,12, M. Barbetti27, I. R. Barbosa71, R. J. Barlow64,a, M. Barnyakov25, S. Barsuk14, W. Barter60, J. Bartz70, S. Bashir40, B. Batsukh5, P. B. Battista14, A. Bay51, A. Beck66, M. Becker19, F. 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Zuliani33,x, 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
  • 45Universidade da Coruña, A Coruña, Spain
  • 46ICCUB, Universitat de Barcelona, Barcelona, Spain
  • 47La Salle, Universitat Ramon Llull, Barcelona, Spain
  • 48Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
  • 49Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia—CSIC, Valencia, Spain
  • 50European Organization for Nuclear Research (CERN), Geneva, Switzerland
  • 51Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
  • 52Physik-Institut, Universität Zürich, Zürich, Switzerland
  • 53NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
  • 54Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
  • 55School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
  • 56H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
  • 57Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
  • 58Department of Physics, University of Warwick, Coventry, United Kingdom
  • 59STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
  • 60School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
  • 61School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
  • 62Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
  • 63Imperial College London, London, United Kingdom
  • 64Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
  • 65Department of Physics, University of Oxford, Oxford, United Kingdom
  • 66Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
  • 67University of Cincinnati, Cincinnati, Ohio, USA
  • 68University of Maryland, College Park, Maryland, USA
  • 69Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA
  • 70Syracuse University, Syracuse, New York, USA
  • 71Pontifícia 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)
  • 72Universidad Andres Bello, Santiago, Chile (associated with Physik-Institut, Universität Zürich, Zürich, Switzerland)
  • 73School of Physics and Electronics, Hunan University, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
  • 74State Key Laboratory of Nuclear Physics and Technology, South China Normal University, Guangzhou, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
  • 75Lanzhou University, Lanzhou, China (associated with Institute of High Energy Physics (IHEP), Beijing, China)
  • 76School of Physics and Technology, Wuhan University, Wuhan, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
  • 77Henan Normal University, Xinxiang, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
  • 78Departamento 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)
  • 79Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic (associated with Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom)
  • 80Ruhr Universitaet Bochum, Fakultaet für Physik und Astronomie, Bochum, Germany (associated with Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany)
  • 81Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland)
  • 82Faculty of Physics, Vilnius University, Vilnius, Lithuania (associated with Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany)
  • 83Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
  • 84Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
  • 85Tadeusz Kosciuszko Cracow University of Technology, Cracow, Poland (associated with Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland)
  • 86Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom)
  • 87Taras Schevchenko University of Kyiv, Faculty of Physics, Kyiv, Ukraine (associated with Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France)
  • 88University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA)
  • 89Ohio State University, Columbus, Ohio, USA (associated with Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA)

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

Phys. Rev. Lett. 137, 021802 – Published 8 July, 2026

DOI: https://doi.org/10.1103/24g9-yn9d

Abstract

An analysis of the B0K*0(K+π)μ+μ decay is presented using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 8.4fb1. The full set of CP-averaged and CP-asymmetric angular observables is determined in bins of the invariant mass squared of the dimuon system, as well as the branching fraction relative to the B0J/ψ(μ+μ)K+π decay. For the first time, the full set of observables pertaining to the K+π S-wave contribution to the final state are presented and consideration is given to effects arising from the mass of the muons. The extracted CP-asymmetry observables show no significant deviations from zero. The measurements of the CP-averaged observables and the branching fractions continue to exhibit the pattern of tensions with the standard model predictions that have been seen in previous analyses that use part of the dataset considered in this Letter.

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Physics Subject Headings (PhySH)

Viewpoint

A Widening Anomaly Strains the Standard Model

Published 8 July, 2026

Does a new measurement of a rare decay of the neutral B meson portend new physics?

See more in Physics

Article Text

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