Observation of charge–parity symmetry breaking in baryon decays

The Standard Model of particle physics-the theory of particles and interactions at the smallest scale-predicts that matter and antimatter interact differently due to violation of the combined symmetry of charge conjugation (C) and parity (P). Charge conjugation transforms particles into their antimatter particles, whereas the parity transformation inverts spatial coordinates. This prediction applies to both mesons, which consist of a quark and an antiquark, and baryons, which are composed of three quarks. However, despite having been discovered in various meson decays, CP violation has yet to be observed in baryons, the type of matter that makes up the observable Universe. Here we report a study of the decay of the beauty baryon <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow> <mml:mrow><mml:mn>0</mml:mn></mml:mrow> <mml:mrow><mml:mi>b</mml:mi></mml:mrow> </mml:msubsup> </mml:math> to the pK<sup>-</sup>π<sup>+</sup>π<sup>-</sup> final state, which proceeds through b → u or b → s quark-level transitions, and its CP-conjugated process, using data collected by the Large Hadron Collider beauty experiment<sup>1</sup> at the European Organization for Nuclear Research (CERN). The results reveal significant asymmetries between the decay rates of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow> <mml:mrow><mml:mn>0</mml:mn></mml:mrow> <mml:mrow><mml:mi>b</mml:mi></mml:mrow> </mml:msubsup> </mml:math> baryon and its CP-conjugated antibaryon, providing, to our knowledge, the first observation of CP violation in baryon decays and demonstrating the different behaviours of baryons and antibaryons. In the Standard Model, CP violation arises from the Cabibbo-Kobayashi-Maskawa mechanism<sup>2</sup>, and new forces or particles beyond the Standard Model could provide further contributions. This discovery opens a new path in the search for physics beyond the Standard Model.

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Nature
Published
2025-07-16
DOI
https://doi.org/10.1038/s41586-025-09119-3
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20
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Particle physics theoretical and experimental studies
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article
Field-Weighted Citation Impact
37.40

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article

Observation of charge–parity symmetry breaking in baryon decays

O. Leroy, J. Heuel, D. Karpenkov, P. Ilten et al.
20 citations
Nature
Particle physics theoretical and experimental studies
37.40
article

Observation of charge–parity symmetry breaking in baryon decays

O. Leroy, J. Heuel, D. Karpenkov, P. Ilten, Ö. Özçelik, V. Matiunin, A. Grecu, J. Hammerich, A. Inglessi, A. Okhotnikov, J. Novoa Fernandez, M. Pló Casasús, R. Matev, G. Mancinelli, Rita Sadek, D. S. Mitzel, F. Ferreira Rodrigues, P. K. Resmi, A. Mauri, Irene Bachiller Perea, S. J. Jaimes Elles, D. Nicotra, P. Baladrón Rodríguez, J. J. Back, José Javier Saavedra-Arias, Miguel Ruiz Diaz, W. Krupa, S. Barsuk, M. Schiller, Riccardo Nunzio Pilato, L. Martinazzoli, A. Biolchini, E. Rodriguez Fernandez, Z. Ghorbanimoghaddam, C. Betancourt, L. Garrido, A. Merli, A. Lampis, J. Reich, S. Bachmann, Anne Álvarez, F. Polci, M. Becker, B. Sciascia, O. Kot, I. Gorelov, S. Legotin, W. Morren, Lauren Grace Mackey, Justin Bartz, C. Landesa Gomez, G. Haefeli, Frédéric Hemmer, Pei‐Rong Li, V. Yeroshenko, Mikhail Barnyakov, Arsenii Gavrikov, Tianze Rong, Marion Lehuraux, T. Fiutowski, Gianluca Zunica, Z. Ren, A. Brea Rodríguez, K. Belous, R. I. Rabadán Trejo, A. Maevskiy, R. Aaij, K. Klimaszewski, C. S. Bolognani, T. Fulghesu, P. A. Günther, A. Massafferri, E. Graugés, A. Solovev, T. Blake, A. Balboni, E. Zaffaroni, Domenico Riccardi, Alberto Perro, Bridget Mack, M. Mulder, A. J. Chadwick, I. Juszczak, J. L. Amey, V. V. Gligorov, J. Horswill, D. J. Unverzagt, E. Dall’Occo, Lorenzo Piccolo, R. Le Gac, F. Bedeschi, Qile Niu, Lars Kolk, L. R. Madhan Mohan, S. Stanislaus, L. Meyer Garcia, A. Lai, Manuel Gálvez, S. Okamura, C. J. G. Onderwater, R. Oldeman, Y. R. Hou, M. S. Rangel, A. Contu, A. Lopez Huertas, J. A. Ward, M. Calvo Gomez, Izaac Sanderswood, A. S. W. Abdelmotteleb, C. Kar, Viktor Mytrochenko, A. Perrevoort, Alexander Korchin, C. Patrignani, V. Cavallini, Paloma Laguarta Gonzalez, M. Hartmann, Xiaofan Pan, R. A. Mohammed, E. Graverini, J. Mazorra de Cos, Felicia Carolin Volle, Frank Xiangyu Liu, A. Sciuccati, V. Duk, C. Gotti, C. Trippl, Emily Kaiyin Jiang, Xiaohan Wang, Jonah Evan Blank, L. Paolucci, S. Capelli, E. Smith, Thomas Long, N. Cooke, A. Dziurda, P. Ciambrone, Jan de Boer, L. Z. Zhu, M. Chrząszcz, Alex Daniel Fernez, D. Fazzini, Zeqing Mu, M. Fiorini, B. Batsukh, D. Parmar, R. Santacesaria, A. Cardini, S. Kubis, M. Needham, M. Adinolfi, M. Kucharczyk, P. Duda, A. Saputi, P. De Simone, J. H. Lopes, X. Tong, J. García Pardiñas, Lucas Martel, Alexander Davidson, D. Torres Machado, Paula Herrero Gascon, P. Koppenburg, J. F. Marchand, R. A. Ruiz Fernandez, S. Klaver, D. Liu, A. Danilina, L. Shchutska, M. R. Kmiec, Yiwei Liu, L. Shekhtman, F. C. R. Bishop, M. Rebollo De Miguel, Graham Hallett, I. Kostiuk, K. De Bruyn, R. Bolzonella, L. Golinka-Bezshyyko, J. Nicolini, T. Poeschl, Matthew David Monk, E. J. Walton, Lanxing Li, E. Muhammad, V. Zhukov, Manuel Ramírez García, D. Maisuzenko, C. Zeng, Igor Kyryllin, E. Polycarpo, Kate Lynch, R. Bernet, Innes Mackay, Lucas Dittmann, M. P. Morgenthaler, M. Mazurek, M. Birch, S. Blusk, M. van Veghel, Kunal Garg, V. Obraztsov, R. D. L. Henderson, M. Barbetti, S. Esen, A. Poluektov, S. 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Abstract

The Standard Model of particle physics-the theory of particles and interactions at the smallest scale-predicts that matter and antimatter interact differently due to violation of the combined symmetry of charge conjugation (C) and parity (P). Charge conjugation transforms particles into their antimatter particles, whereas the parity transformation inverts spatial coordinates. This prediction applies to both mesons, which consist of a quark and an antiquark, and baryons, which are composed of three quarks. However, despite having been discovered in various meson decays, CP violation has yet to be observed in baryons, the type of matter that makes up the observable Universe. Here we report a study of the decay of the beauty baryon <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow> <mml:mrow><mml:mn>0</mml:mn></mml:mrow> <mml:mrow><mml:mi>b</mml:mi></mml:mrow> </mml:msubsup> </mml:math> to the pK<sup>-</sup>π<sup>+</sup>π<sup>-</sup> final state, which proceeds through b → u or b → s quark-level transitions, and its CP-conjugated process, using data collected by the Large Hadron Collider beauty experiment<sup>1</sup> at the European Organization for Nuclear Research (CERN). The results reveal significant asymmetries between the decay rates of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow> <mml:mrow><mml:mn>0</mml:mn></mml:mrow> <mml:mrow><mml:mi>b</mml:mi></mml:mrow> </mml:msubsup> </mml:math> baryon and its CP-conjugated antibaryon, providing, to our knowledge, the first observation of CP violation in baryon decays and demonstrating the different behaviours of baryons and antibaryons. In the Standard Model, CP violation arises from the Cabibbo-Kobayashi-Maskawa mechanism<sup>2</sup>, and new forces or particles beyond the Standard Model could provide further contributions. This discovery opens a new path in the search for physics beyond the Standard Model.

NatureVol. 643(8074)
University College Dublin (IE), Eötvös Loránd University (HU), Universidade da Coruña (ES), Universidade Federal do Rio de Janeiro (BR), University of Modena and Reggio Emilia (IT), 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), École Polytechnique (FR), University of Liverpool (GB), Universitat de València (ES), University of Freiburg (DE), Hunan University (CN), Délégation Paris 7 (FR), University of Groningen (NL), Vilnius University (LT), South China Normal University (CN), Taras Shevchenko National University of Kyiv (UA), Université Clermont Auvergne (FR), Universidade de Santiago de Compostela (ES), TU Dortmund University (DE), Peking University (CN), University of Zurich (CH), 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), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Université Paris-Saclay (FR), University of Michigan (US), Laboratoire d’Annecy de Physique des Particules (FR), Kharkiv Institute of Physics and Technology (UA), CEA Paris-Saclay - Etablissement de Saclay (FR), 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), Centre de physique des particules de Marseille (FR), National Centre for Nuclear Research (PL), 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), Centro Brasileiro de Pesquisas Físicas (BR), Istituto Nazionale di Fisica Nucleare, Sezione di Genova (IT), CEA Paris-Saclay (FR), 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), 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), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR), Lamarr Institute for Machine Learning and Artificial Intelligence, Consejo Nacional de Rectores, State Key Laboratory of Nuclear Physics and Technology, Imperial College London (GB), École Polytechnique Fédérale de Lausanne (CH), The Ohio State University (US), Universitat Ramon Llull (ES), Monash University (AU), University of Cincinnati (US), Massachusetts Institute of Technology (US), 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), RWTH Aachen University (DE), Ruhr University Bochum (DE), University of Edinburgh (GB), Tsinghua University (CN)
National Science Foundation, U.S. Department of Energy, 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, Institute of High Energy Physics, Fundamental Research Funds for the Central Universities, Institut National de Physique Nucléaire et de Physique des Particules, Nuclear Physics, H2020 Marie Skłodowska-Curie Actions
Partnerships for the goals
Openalex Percentile: Top 0%
Particle physics theoretical and experimental studies
37.40
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