Study of the rare decay J/ψ → μ+μ−μ+μ−

A bstract The rare electromagnetic J/ψ → μ + μ − μ + μ − decay is observed with a significance greatly exceeding the discovery threshold, using proton-proton collision data collected by the LHCb experiment during 2016–2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5 . 4 fb − 1 . The rate of this decay is measured relative to that of the J/ψ → μ + μ − mode. Using the QED model for the four-muon decay in the efficiency estimation, its branching fraction is determined to be $$ \mathcal{B}\left(J/\psi \to {\mu}^{+}{\mu}^{-}{\mu}^{+}{\mu}^{-}\right)=\left(1.13\pm 0.10\pm 0.05\pm 0.01\right)\times {10}^{-6}, $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>B</mml:mi> <mml:mfenced> <mml:mrow> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>−</mml:mo> </mml:msup> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>−</mml:mo> </mml:msup> </mml:mrow> </mml:mfenced> <mml:mo>=</mml:mo> <mml:mfenced> <mml:mrow> <mml:mn>1.13</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.10</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.05</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.01</mml:mn> </mml:mrow> </mml:mfenced> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>6</mml:mn> </mml:mrow> </mml:msup> <mml:mo>,</mml:mo> </mml:math> where the uncertainties are statistical, systematic and due to the uncertainty on the branching fraction of the J/ψ → μ + μ − decay.

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Journal
Journal of High Energy Physics
Published
2024-12-10
DOI
https://doi.org/10.1007/jhep12(2024)062
Primary Topic
Particle physics theoretical and experimental studies
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article
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article

Study of the rare decay J/ψ → μ+μ−μ+μ−

L. De Paula, I. Corredoira, M. M. Duras, O. Ozcelik et al.
Journal of High Energy Physics
Particle physics theoretical and experimental studies
article

Study of the rare decay J/ψ → μ+μ−μ+μ−

L. De Paula, I. Corredoira, M. M. Duras, O. Ozcelik, D. Martínez Santos, W. Liu, N. Kleijne, M. Martinelli, M. Ferro-Luzzi, S. Jakobsen, G. Raven, D. Karpenkov, G. Punzi, B. Khanji, G. M. Manca, C. Vrahas, I. Sanderswood, P. Ilten, A. Beck, V. Matiunin, J. Xu, David Johnson, M. D. Sokoloff, D. Bacher, F. Abudinén, C. Prouvé, W. Baldini, A. Schopper, A. Inglessi, K. Fischer, H. Schindler, M. Fontana, K. Richardson, M. Monk, A. Okhotnikov, J. Novoa Fernandez, Rong Tian, L. Giambastiani, P. Garcia Moreno, S. Ely, M. Poli Lener, A. Kharisova, G. Mancinelli, F. Blanc, Rita Sadek, F. Pisani, D. S. Mitzel, F. Ferreira Rodrigues, L. Kolk, L. Sun, S. Easo, A. Konoplyannikov, Irene Bachiller Perea, B. Couturier, B. Dey, A.-K. Guseinov, D. Nicotra, Z. Chen, F. De Vellis, P. Baladrón Rodríguez, V. Shevchenko, G. Galati, T. Miralles, Q. Li, Augusto Sciuccati, José Javier Saavedra-Arias, M. Bartolini, D. Miao, N. R. Sahoo, W. Krupa, F. Borgato, G. Pietrzyk, S. Barsuk, M. Schiller, U. Egede, L. 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Abstract

A bstract The rare electromagnetic J/ψ → μ + μ − μ + μ − decay is observed with a significance greatly exceeding the discovery threshold, using proton-proton collision data collected by the LHCb experiment during 2016–2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5 . 4 fb − 1 . The rate of this decay is measured relative to that of the J/ψ → μ + μ − mode. Using the QED model for the four-muon decay in the efficiency estimation, its branching fraction is determined to be $$ \mathcal{B}\left(J/\psi \to {\mu}^{+}{\mu}^{-}{\mu}^{+}{\mu}^{-}\right)=\left(1.13\pm 0.10\pm 0.05\pm 0.01\right)\times {10}^{-6}, $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>B</mml:mi> <mml:mfenced> <mml:mrow> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>−</mml:mo> </mml:msup> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>−</mml:mo> </mml:msup> </mml:mrow> </mml:mfenced> <mml:mo>=</mml:mo> <mml:mfenced> <mml:mrow> <mml:mn>1.13</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.10</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.05</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.01</mml:mn> </mml:mrow> </mml:mfenced> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>6</mml:mn> </mml:mrow> </mml:msup> <mml:mo>,</mml:mo> </mml:math> where the uncertainties are statistical, systematic and due to the uncertainty on the branching fraction of the J/ψ → μ + μ − decay.

Journal of High Energy PhysicsVol. 2024(12)
University College Dublin (IE), University of Siena (IT), Eötvös Loránd University (HU), University of Pisa (IT), Universidade da Coruña (ES), University of Bergamo (IT), University of Rome Tor Vergata (IT), Universidade Federal do Rio de Janeiro (BR), Uppsala University (SE), Jagiellonian University (PL), Rutherford Appleton Laboratory (GB), Centre National de la Recherche Scientifique (FR), Los Alamos National Laboratory (US), University of Bonn (DE), University of Padua (IT), École Polytechnique (FR), University of Liverpool (GB), Universidade de Brasília (BR), Scuola Normale Superiore (IT), Federal Center for Technological Education Celso Suckow da Fonseca (BR), Universitat de València (ES), Hunan University (CN), National Autonomous University of Honduras (HN), Délégation Paris 7 (FR), University of Groningen (NL), University of Cagliari (IT), Henan University (CN), South China Normal University (CN), University of Milan (IT), Universidad de Alcalá (ES), University of Urbino (IT), Université Clermont Auvergne (FR), Universidade de Santiago de Compostela (ES), TU Dortmund University (DE), University of Ferrara (IT), Peking University (CN), University of Zurich (CH), University of Basilicata (IT), Université Paris Cité (FR), Aix-Marseille Université (FR), Heidelberg University (DE), University of Cambridge (GB), Cracow University of Technology (PL), Pontifícia Universidade Católica do Rio de Janeiro (BR), University of Perugia (IT), Université Paris-Saclay (FR), University of Michigan (US), Kharkiv Institute of Physics and Technology (UA), Australian Regenerative Medicine Institute (AU), University of Manchester (GB), Maastricht University (NL), University of Bristol (GB), Universidad Nacional de Colombia (CO), Wuhan University (CN), University of Warwick (GB), Sorbonne Université (FR), University of Oxford (GB), Central China Normal University (CN), Sorbonne Paris Cité (FR), Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering (RO), National Institute for Subatomic Physics (NL), National Centre for Nuclear Research (PL), Instituto de Física Corpuscular (ES), Laboratoire de Physique de Clermont Auvergne (FR), Laboratoire de Physique Nucléaire et de Hautes Énergies (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT), Institute of Nuclear Physics, Polish Academy of Sciences (PL), Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Bari (IT), Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata (IT), FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ), Centro Brasileiro de Pesquisas Físicas (BR), Istituto Nazionale di Fisica Nucleare, Sezione di Genova (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Firenze (IT), Institut National de Physique Nucléaire et de Physique des Particules (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Milano (IT), Institute of High Energy Physics (CN), Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca (IT), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (IT), Institute for Nuclear Research (UA), Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (IT), Laboratoire Leprince-Ringuet (FR), Max Planck Institute for Nuclear Physics (DE), Istituto Nazionale di Fisica Nucleare, Sezione di Roma I (IT), LIP6 (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Pisa (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Perugia (IT), University of Chinese Academy of Sciences (CN), Consejo Nacional de Rectores, State Key Laboratory of Nuclear Physics and Technology, University of Florence (IT), Imperial College London (GB), École Polytechnique Fédérale de Lausanne (CH), University of Bari Aldo Moro (IT), Universitat Ramon Llull (ES), Monash University (AU), University of Cincinnati (US), Massachusetts Institute of Technology (US), University of Milano-Bicocca (IT), University of Maryland, College Park (US), European Organization for Nuclear Research (CH), AGH University of Krakow (PL), Université Savoie Mont Blanc (FR), Syracuse University (US), Universitat de Barcelona (ES), Lanzhou University (CN), University of Glasgow (GB), University of Birmingham (GB), University of Genoa (IT), RWTH Aachen University (DE), Ruhr University Bochum (DE), University of Bologna (IT), University College of Applied Science (PS), University of Edinburgh (GB), Tsinghua University (CN)
National Science Foundation, U.S. Department of Energy, Alexander von Humboldt-Stiftung, CERN, UK Research and Innovation, Ministerul Cercetării, Inovării şi Digitalizării, Institutul National de Cercetare-Dezvoltare pentru Fizica si Inginerie Nucleara 'Horia Hulubei', Leverhulme Trust, European Commission, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, National Natural Science Foundation of China, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Bundesministerium für Bildung und Forschung, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Generalitat Valenciana, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Max-Planck-Gesellschaft, Ministerstwo Edukacji i Nauki, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, National Academy of Sciences of Ukraine, Centre National de la Recherche Scientifique, Financiadora de Estudos e Projetos, Région Auvergne-Rhône-Alpes, CAS Center for Excellence in Particle Physics, Australian Research Data Commons, Science and Technology Facilities Council, Deutsches Elektronen-Synchrotron, Agencia Estatal de Investigación, Fundamental Research Funds for the Central Universities, Institut National de Physique Nucléaire et de Physique des Particules, Nuclear Physics
Affordable and clean energy
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Particle physics theoretical and experimental studies
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