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Measurements of Z-Boson Pair Entanglement in Decays of Higgs Bosons at the ATLAS Experiment

G. Aad102, E. Aakvaag17, B. Abbott121, S. Abdelhameed83b, K. Abeling54, N. J. Abicht48, S. H. Abidi30, M. Aboelela44, A. Aboulhorma36e et al. (ATLAS Collaboration)

A. Aboulhorma36e, H. Abramowicz154, B. S. Acharya68a,68b,b, A. Ackermann62a, C. Adam Bourdarios4, L. Adamczyk85a, S. V. Addepalli146, M. J. Addison101, J. Adelman117, A. Adiguzel22c, T. Adye135, A. A. Affolder137, Y. Afik39, M. N. Agaras13, A. Aggarwal100, C. Agheorghiesei28c, J. A. Aguilar Saavedrac, A. Ahmad83a, F. Ahmadov38,d, S. Ahuja95, S. Ahuja165, X. Ai113c, G. Aielli75a,75b, A. Aikot165, M. Ait Tamlihat36e, T. P. A. Åkesson98, D. Akiyama170, N. N. Akolkar25, S. Aktas168, G. L. Alberghi24b, J. Albert167, U. Alberti20, P. Albicocco52, S. Alderweireldt51, Z. L. Alegria122, M. Aleksa37, I. N. Aleksandrov38, C. Alexa28b, T. Alexopoulos10, F. Alfonsi24b, M. Algren55, M. Alhroob169, B. Ali133, H. M. J. Ali91,e, S. Ali32, S. W. Alibocus92, M. Aliev34c, G. Alimonti70a, C. Allaire65, B. M. M. Allbrooke149, D. R. Allen122, J. S. Allen101, J. F. Allen51, C. S. Alley1, E. R. Almazan137, A. Aloisio71a,71b, F. Alonso90, C. Alpigiani140, A. Alvarez Fernandez100, M. Alves Cardoso55, M. G. 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Valentinetti24b,24a, A. Valero165, E. Valiente Moreno165, A. Vallier89, J. A. Valls Ferrer165, D. R. Van Arneman116, R. Van Den Broucke128, A. Van Der Graaf48, H. Z. Van Der Schyf34j, P. Van Gemmeren6, M. Van Rijnbach37, S. Van Stroud96, I. Van Vulpen116, P. Vana134, M. Vanadia75a,75b, U. M. Vande Voorde147, W. Vandelli37, E. R. Vandewall146, D. Vannicola154, R. Vari74a, M. Varma174, E. W. Varnes7, C. Varni85a, D. Varouchas65, L. Varriale165, K. E. Varvell150, M. E. Vasile28b, A. Vasileiadou9, L. Vaslin82, M. D. Vassilev146, A. Vasyukov38, L. M. Vaughan122, R. Vavricka134, T. Vazquez Schroeder13, J. Veatch32, V. Vecchio101, M. J. Veen103, I. Veliscek30, I. Velkovska93, L. M. Veloce158, F. Veloso131a,131c, A. G. Veltman51, S. H. Venetianer161, S. Veneziano74a, A. Ventura69a,69b, A. Verbytskyi110, M. Verducci73a,73b, C. Vergis94, M. Verissimo De Araujo81b, W. Verkerke116, J. C. Vermeulen116, C. Vernieri146, M. Vessella162, M. C. Vetterli145,u, A. Vgenopoulos100, N. Viaux Maira138g,tt, L. Vicenik133, T. Vickey142, O. E. Vickey Boeriu142, G. H. A. Viehhauser127, L. Vigani62b, M. Vigl110, M. Villa24b,24a, M. Villaplana Perez165, E. M. Villhauer39, E. Vilucchi52, M. Vincent165, M. G. Vincter35, A. Visibile116, A. Visive116, C. Vittori161, I. Vivarelli24b,24a, M. I. Vivas Albornoz47, E. Voevodina110, F. Vogel109, J. C. Voigt49, P. Vokac133, Yu. Volkotrub85b, L. Vomberg25, E. Von Toerne25, B. Vormwald37, K. Vorobev50, M. Vos165, K. Voss144, M. Vozak37, L. Vozdecky121, N. Vranjes16, M. Vranjes Milosavljevic16, M. Vreeswijk116, N. K. Vu112a, R. Vuillermet37, O. Vujinovic100, I. Vukotic39, I. K. Vyas35, J. F. Wack33, A. Wada111, S. Wada160, C. Wagner146, J. M. Wagner18a, W. Wagner173, S. Wahdan173, H. Wahlberg90, C. H. Waits121, J. Walder135, R. Walker109, K. Walkingshaw Pass58, W. Walkowiak144, A. Wall129, E. J. Wallin98, T. Wamorkar146, K. Wandall-Christensen165, A. Wang61, A. Z. Wang137, C. Wang47, C. Wang11, H. Wang18a, J. Wang63c, P. Wang101, P. Wang96, R. Wang60, R. Wang106, R. Wang6, S. M. Wang151, S. Wang14, T. Wang115, T. Wang61, W. T. Wang127, W. Wang113c, X. Wang164, X. Wang141a, X. Wang47, Y. Wang148, Y. Wang114, Z. Wang106, Z. Wang14, Z. Wang63b, C. Wanotayaroj82, A. Warburton104, A. L. Warnerbring144, S. Waterhouse96, A. T. Watson21, H. Watson51, M. F. Watson21, E. Watton37, G. Watts140, B. M. Waugh96, J. M. Webb53, C. Weber30, M. S. Weber20, C. Wei61, Y. Wei53, A. R. Weidberg127, E. J. Weik118, J. Weingarten48, C. Weiser53, C. J. Wells47, P. S. Wells37, T. Wenaus30, T. Wengler37, N. S. Wenke110, N. Wermes25, D. Werner47, M. Wessels62a, A. M. Wharton91, A. S. White37, A. White8, M. J. White1, D. Whiteson162, L. Wickremasinghe125, W. Wiedenmann172, M. Wielers135, R. Wierda147, C. Wiglesworth42, H. G. Wilkens37, J. J. H. Wilkinson33, S. Williams33, S. Willocq103, D. J. Wilson101, P. J. Windischhofer39, F. I. Winkel31, F. Winklmeier124, B. T. Winter53, M. Wittgen146, M. Wobisch97, T. Wojtkowski59, Z. Wolffs116, J. Wollrath37, M. W. Wolter86, H. Wolters131a,131c, M. C. Wong137, E. L. Woodward41, S. D. Worm47, B. K. Wosiek86, K. A. Wozniak55, K. W. Woźniak86, S. Wozniewski54, K. Wraight58, C. Wu158, C. Wu21, J. Wu156, M. Wu112b, M. Wu115, S. L. Wu172, S. Wu14,uu, X. Wu61, Y. Q. Wu158, Y. Wu61, Z. Wu102, Z. Wu112a, J. Wuerzinger110, T. R. Wyatt101, B. M. Wynne51, S. Xella42, L. Xia112a, M. Xie61, A. Xiong124, I. Xiotidis37, D. Xu14, H. Xu61, L. Xu61, R. Xu129, T. Xu106, W. Xu112a, Y. Xu140, Z. Xu51, R. Xue130, B. Yabsley150, S. Yacoob11, Y. Yamaguchi82, E. Yamashita156, H. Yamauchi160, T. Yamazaki18a, Y. Yamazaki84, S. Yan58, Z. Yan103, C. Yang18a, H. J. Yang141a, H. T. Yang61, S. Yang61, X. Yang37, X. Yang14, Y. Yang156, Y. Yang61, W-M. Yao18a, C. L. Yardley149, J. Ye14, S. Ye30, X. Ye61, I. Yeletskikh38, B. Yeo18b, M. R. Yexley96, T. P. Yildirim127, K. Yorita170, C. J. S. Young37, C. Young146, I. N. L. Young58, N. D. Young124, Y. Yu61, J. Yuan14,112c,uu, M. Yuan106, R. Yuan141b, L. Yue96, M. Zaazoua61, B. Zabinski86, I. Zahir36a, Q. U. A. Zahoor51, A. Zaio56b,56a, Z. K. Zak86, T. Zakareishvili165, S. Zambito55, J. Zang156, R. Zanzottera70a,70b, O. Zaplatilek133, E. Zaya147, C. Zeitnitz173, H. Zeng14, D. T. Zenger, Jr.27, T. Ženiš29a, S. Zenz94, D. Zerwas65, W. Zhan61, B. Zhang169, D. F. Zhang142, G. Zhang14,uu, J. Zhang113b, J. Zhang6, L. Zhang61, L. Zhang112a, P. Zhang14,112c, R. Zhang112a, S. Zhang36e, Y. Zhang140, Y. Zhang96, Y. Zhang61, Y. Zhang112a, Z. Zhang18a, Z. Zhang113b, Z. Zhang65, H. Zhao140, T. Zhao113b, Y. Zhao35, Z. Zhao61, Z. Zhao61, A. Zhemchugov38, J. Zheng112a, K. Zheng164, L. Zheng113b, X. Zheng61, Z. Zheng146, D. Zhong164, B. Zhou106, B. Zhou141b,141a, N. Zhou141a, Y. Zhou15, Y. Zhou112a, Y. Zhou7, Z. Zhou61, J. Zhu106, X. Zhu141b, Y. Zhu141a, X. Zhuang14, K. Zhukov67, P. Ziakas4, N. I. Zimine38, J. Zinsser62b, M. Ziolkowski144, L. Živković16, A. Zoccoli24b,24a, K. Zoch37, A. Zografos37, T. G. Zorbas142, and L. Zwalinski37 (ATLAS Collaboration)

  • 1Department of Physics, University of Adelaide, Adelaide, Australia
  • 2Department of Physics, University of Alberta, Edmonton, Alberta, Canada
  • 3aDepartment of Physics, Ankara University, Ankara, Türkiye
  • 3bDivision of Physics, TOBB University of Economics and Technology, Ankara, Türkiye
  • 4LAPP, Université Savoie Mont Blanc, CNRS/IN2P3, Annecy, France
  • 5APC, Université Paris Cité, CNRS/IN2P3, Paris, France
  • 6High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois, USA
  • 7Department of Physics, University of Arizona, Tucson, Arizona, USA
  • 8Department of Physics, University of Texas at Arlington, Arlington, Texas, USA
  • 9Physics Department, National and Kapodistrian University of Athens, Athens, Greece
  • 10Physics Department, National Technical University of Athens, Zografou, Greece
  • 11Department of Physics, University of Texas at Austin, Austin, Texas, USA
  • 12Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan
  • 13Institut de Física d’Altes Energies (IFAE), Barcelona Institute of Science and Technology, Barcelona, Spain
  • 14Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
  • 15Physics Department, Tsinghua University, Beijing, China
  • 16Institute of Physics, University of Belgrade, Belgrade, Serbia
  • 17Department for Physics and Technology, University of Bergen, Bergen, Norway
  • 18aPhysics Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
  • 18bUniversity of California, Berkeley, California, USA
  • 19Institut für Physik, Humboldt Universität zu Berlin, Berlin, Germany
  • 20Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, Switzerland
  • 21School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
  • 22aDepartment of Physics, Bogazici University, Istanbul, Türkiye
  • 22bDepartment of Physics Engineering, Gaziantep University, Gaziantep, Türkiye
  • 22cDepartment of Physics, Istanbul University, Istanbul, Türkiye
  • 23aFacultad de Ciencias y Centro de Investigaciónes, Universidad Antonio Nariño, Bogotá, Colombia
  • 23bDepartamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia
  • 24aDipartimento di Fisica e Astronomia A. Righi, Università di Bologna, Bologna, Italy
  • 24bINFN Sezione di Bologna, Bologna, Italy
  • 25Physikalisches Institut, Universität Bonn, Bonn, Germany
  • 26Department of Physics, Boston University, Boston, Massachusetts, USA
  • 27Department of Physics, Brandeis University, Waltham, Massachusetts, USA
  • 28aTransilvania University of Brasov, Brasov, Romania
  • 28bHoria Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania
  • 28cDepartment of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, Romania
  • 28dNational Institute for Research and Development of Isotopic and Molecular Technologies, Physics Department, Cluj-Napoca, Romania
  • 28eNational University of Science and Technology Politechnica, Bucharest, Romania
  • 28fWest University in Timisoara, Timisoara, Romania
  • 28gFaculty of Physics, University of Bucharest, Bucharest, Romania
  • 29aFaculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovak Republic
  • 29bDepartment of Subnuclear Physics, Institute of Experimental Physics of the Slovak Academy of Sciences, Kosice, Slovak Republic
  • 30Physics Department, Brookhaven National Laboratory, Upton, New York, USA
  • 31Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, y CONICET, Instituto de Física de Buenos Aires (IFIBA), Buenos Aires, Argentina
  • 32California State University, Fresno, California, USA
  • 33Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
  • 34aDepartment of Physics, University of Cape Town, Cape Town, South Africa
  • 34biThemba Labs, Western Cape, South Africa
  • 34cDepartment of Mechanical Engineering Science, University of Johannesburg, Johannesburg, South Africa
  • 34dNational Institute of Physics, University of the Philippines Diliman (Philippines), Quezon City, Philippines
  • 34eDepartment of Physics, Stellenbosch University, Matieland, South Africa
  • 34fUniversity of KwaZulu-Natal, School of Agriculture and Science, Mathematics, Westville, South Africa
  • 34gUniversity of South Africa, Department of Physics, Pretoria, South Africa
  • 34hUniversity of Pretoria, Department of Mechanical and Aeronautical Engineering, Pretoria, South Africa
  • 34iUniversity of Zululand, KwaDlangezwa, South Africa
  • 34jSchool of Physics, University of the Witwatersrand, Johannesburg, South Africa
  • 35Department of Physics, Carleton University, Ottawa, Ontario, Canada
  • 36aFaculté des Sciences Ain Chock, Université Hassan II de Casablanca, Casablanca, Morocco
  • 36bFaculté des Sciences, Université Ibn-Tofail, Kénitra, Morocco
  • 36cFaculté des Sciences Semlalia, Université Cadi Ayyad, LPHEA-Marrakech, Morocco
  • 36dLPMR, Faculté des Sciences, Université Mohamed Premier, Oujda, Morocco
  • 36eFaculté des sciences, Université Mohammed V, Rabat, Morocco
  • 36fInstitute of Applied Physics, Mohammed VI Polytechnic University, Ben Guerir, Morocco
  • 37CERN, Geneva, Switzerland
  • 38Affiliated with an international laboratory covered by a cooperation agreement with CERN
  • 39Enrico Fermi Institute, University of Chicago, Chicago, Illinois, USA
  • 40LPC, Université Clermont Auvergne, CNRS/IN2P3, Clermont-Ferrand, France
  • 41Nevis Laboratory, Columbia University, Irvington New York, USA
  • 42Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
  • 43aDipartimento di Fisica, Università della Calabria, Rende, Italy
  • 43bINFN Gruppo Collegato di Cosenza, Laboratori Nazionali di Frascati, Frascati, Italy
  • 44Physics Department, Southern Methodist University, Dallas, Texas, USA
  • 45National Centre for Scientific Research “Demokritos”, Agia Paraskevi, Greece
  • 46aDepartment of Physics, Stockholm University, Sweden
  • 46bOskar Klein Centre, Stockholm, Sweden
  • 47Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany
  • 48Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
  • 49Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany
  • 50Department of Physics, Duke University, Durham, North Carolina, USA
  • 51SUPA—School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
  • 52INFN e Laboratori Nazionali di Frascati, Frascati, Italy
  • 53Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
  • 54II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany
  • 55Département de Physique Nucléaire et Corpusculaire, Université de Genève, Genève, Switzerland
  • 56aDipartimento di Fisica, Università di Genova, Genova, Italy
  • 56bINFN Sezione di Genova, Genova, Italy
  • 57II. Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, Germany
  • 58SUPA—School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
  • 59LPSC, Université Grenoble Alpes, CNRS/IN2P3, Grenoble INP, Grenoble, France
  • 60Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge, Massachusetts, USA
  • 61Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, China
  • 62aKirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
  • 62bPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
  • 63aDepartment of Physics, Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
  • 63bDepartment of Physics, University of Hong Kong, Hong Kong, China
  • 63cDepartment of Physics and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
  • 64Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
  • 65IJCLab, Université Paris-Saclay, CNRS/IN2P3, 91405, Orsay, France
  • 66Centro Nacional de Microelectrónica (IMB-CNM-CSIC), Barcelona, Spain
  • 67Department of Physics, Indiana University, Bloomington, Indiana, USA
  • 68aINFN Gruppo Collegato di Udine, Sezione di Trieste, Udine, Italy
  • 68bICTP, Trieste, Italy
  • 68cDipartimento Politecnico di Ingegneria e Architettura, Università di Udine, Udine, Italy
  • 69aINFN Sezione di Lecce, Lecce, Italy
  • 69bDipartimento di Matematica e Fisica, Università del Salento, Lecce, Italy
  • 70aINFN Sezione di Milano, Milano, Italy
  • 70bDipartimento di Fisica, Università di Milano, Milano, Italy
  • 71aINFN Sezione di Napoli, Napoli, Italy
  • 71bDipartimento di Fisica, Università di Napoli, Napoli, Italy
  • 72aINFN Sezione di Pavia, Pavia, Italy
  • 72bDipartimento di Fisica, Università di Pavia, Pavia, Italy
  • 73aINFN Sezione di Pisa, Pisa, Italy
  • 73bDipartimento di Fisica E. Fermi, Università di Pisa, Pisa, Italy
  • 74aINFN Sezione di Roma, Roma, Italy
  • 74bDipartimento di Fisica, Sapienza Università di Roma, Roma, Italy
  • 75aINFN Sezione di Roma Tor Vergata, Roma, Italy
  • 75bDipartimento di Fisica, Università di Roma Tor Vergata, Roma, Italy
  • 76aINFN Sezione di Roma Tre, Roma, Italy
  • 76bDipartimento di Matematica e Fisica, Università Roma Tre, Roma, Italy
  • 77aINFN-TIFPA, Trento, Italy
  • 77bUniversità degli Studi di Trento, Trento, Italy
  • 78Universität Innsbruck, Department of Astro and Particle Physics, Innsbruck, Austria
  • 79Department of Physics and Astronomy, Iowa State University, Ames, Iowa, USA
  • 80Istinye University, Sariyer, Istanbul, Türkiye
  • 81aDepartamento de Engenharia Elétrica, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, Brazil
  • 81bUniversidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, Brazil
  • 81cInstituto de Física, Universidade de São Paulo, São Paulo, Brazil
  • 81dRio de Janeiro State University, Rio de Janeiro, Brazil
  • 81eFederal University of Bahia, Bahia, Brazil
  • 82KEK, High Energy Accelerator Research Organization, Tsukuba, Japan
  • 83aKhalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
  • 83bNew York University Abu Dhabi, Abu Dhabi, United Arab Emirates
  • 83cUnited Arab Emirates University, Al Ain, United Arab Emirates
  • 83dUniversity of Sharjah, Sharjah, United Arab Emirates
  • 84Graduate School of Science, Kobe University, Kobe, Japan
  • 85aAGH University of Krakow, Faculty of Physics and Applied Computer Science, Krakow, Poland
  • 85bMarian Smoluchowski Institute of Physics, Jagiellonian University, Krakow, Poland
  • 86Institute of Nuclear Physics Polish Academy of Sciences, Krakow, Poland
  • 87Faculty of Science, Kyoto University, Kyoto, Japan
  • 88Research Center for Advanced Particle Physics and Department of Physics, Kyushu University, Fukuoka, Japan
  • 89L2IT, Université de Toulouse, CNRS/IN2P3, UPS, Toulouse, France
  • 90Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, Argentina
  • 91Physics Department, Lancaster University, Lancaster, United Kingdom
  • 92Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
  • 93Department of Experimental Particle Physics, Jožef Stefan Institute and Department of Physics, University of Ljubljana, Ljubljana, Slovenia
  • 94Department of Physics and Astronomy, Queen Mary University of London, London, United Kingdom
  • 95Department of Physics, Royal Holloway University of London, Egham, United Kingdom
  • 96Department of Physics and Astronomy, University College London, London, United Kingdom
  • 97Louisiana Tech University, Ruston, Louisiana, USA
  • 98Fysiska institutionen, Lunds universitet, Lund, Sweden
  • 99Departamento de Física Teorica C-15 and CIAFF, Universidad Autónoma de Madrid, Madrid, Spain
  • 100Institut für Physik, Universität Mainz, Mainz, Germany
  • 101School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
  • 102CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France
  • 103Department of Physics, University of Massachusetts, Amherst, Massachusetts, USA
  • 104Department of Physics, McGill University, Montreal, Quebec, Canada
  • 105School of Physics, University of Melbourne, Victoria, Australia
  • 106Department of Physics, University of Michigan, Ann Arbor, Michigan, USA
  • 107Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan, USA
  • 108Group of Particle Physics, University of Montreal, Montreal, Quebec, Canada
  • 109Fakultät für Physik, Ludwig-Maximilians-Universität München, München, Germany
  • 110Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), München, Germany
  • 111Graduate School of Science and Kobayashi-Maskawa Institute, Nagoya University, Nagoya, Japan
  • 112aDepartment of Physics, Nanjing University, Nanjing, China
  • 112bSchool of Science, Shenzhen Campus of Sun Yat-sen University, China
  • 112cUniversity of Chinese Academy of Science (UCAS), Beijing, China
  • 113aSchool of Physics, Nankai University, Tianjin, China
  • 113bInstitute of Frontier and Interdisciplinary Science and Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Qingdao, China
  • 113cSchool of Physics, Zhengzhou University, Zhengzhou, China
  • 114Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico, USA
  • 115Institute for Mathematics, Astrophysics and Particle Physics, Radboud University/Nikhef, Nijmegen, Netherlands
  • 116Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, Netherlands
  • 117Department of Physics, Northern Illinois University, DeKalb, Illinois, USA
  • 118Department of Physics, New York University, New York, New York, USA
  • 119Ochanomizu University, Otsuka, Bunkyo-ku, Tokyo, Japan
  • 120Ohio State University, Columbus, Ohio, USA
  • 121Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma, USA
  • 122Department of Physics, Oklahoma State University, Stillwater, Oklahoma, USA
  • 123Palacký University, Joint Laboratory of Optics, Olomouc, Czech Republic
  • 124Institute for Fundamental Science, University of Oregon, Eugene, Oregon, USA
  • 125Graduate School of Science, University of Osaka, Osaka, Japan
  • 126Department of Physics, University of Oslo, Oslo, Norway
  • 127Department of Physics, Oxford University, Oxford, United Kingdom
  • 128LPNHE, Sorbonne Université, Université Paris Cité, CNRS/IN2P3, Paris, France
  • 129Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania, USA
  • 130Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
  • 131aLaboratório de Instrumentação e Física Experimental de Partículas—LIP, Lisboa, Portugal
  • 131bDepartamento de Física, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
  • 131cDepartamento de Física, Universidade de Coimbra, Coimbra, Portugal
  • 131dCentro de Física Nuclear da Universidade de Lisboa, Lisboa, Portugal
  • 131eDepartamento de Física, Escola de Ciências, Universidade do Minho, Braga, Portugal
  • 131fDepartamento de Física Teórica y del Cosmos, Universidad de Granada, Granada (Spain), Spain
  • 131gDepartamento de Física, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
  • 132Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic
  • 133Czech Technical University in Prague, Prague, Czech Republic
  • 134Charles University, Faculty of Mathematics and Physics, Prague, Czech Republic
  • 135Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United Kingdom
  • 136IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
  • 137Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, California, USA
  • 138aDepartamento de Física, Pontificia Universidad Católica de Chile, Santiago, Chile
  • 138bMillennium Institute for Subatomic physics at high energy frontier (SAPHIR), Santiago, Chile
  • 138cInstituto de Investigación Multidisciplinario en Ciencia y Tecnología, y Departamento de Física, Universidad de La Serena, Chile
  • 138dUniversidad Andres Bello, Department of Physics, Santiago, Chile
  • 138eUniversidad San Sebastian, Recoleta, Chile
  • 138fInstituto de Alta Investigación, Universidad de Tarapacá, Arica, Chile
  • 138gDepartamento de Física, Universidad Técnica Federico Santa María, Valparaíso, Chile
  • 139Department of Physics, Institute of Science, Tokyo, Japan
  • 140Department of Physics, University of Washington, Seattle, Washington, USA
  • 141aState Key Laboratory of Dark Matter Physics, School of Physics and Astronomy, Shanghai Jiao Tong University, Key Laboratory for Particle Astrophysics and Cosmology (MOE), SKLPPC, Shanghai, China
  • 141bState Key Laboratory of Dark Matter Physics, Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China
  • 142Department of Physics and Astronomy, University of Sheffield, Sheffield, United Kingdom
  • 143Department of Physics, Shinshu University, Nagano, Japan
  • 144Department Physik, Universität Siegen, Siegen, Germany
  • 145Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada
  • 146SLAC National Accelerator Laboratory, Stanford, California, USA
  • 147Department of Physics, Royal Institute of Technology, Stockholm, Sweden
  • 148Departments of Physics and Astronomy, Stony Brook University, Stony Brook New York, USA
  • 149Department of Physics and Astronomy, University of Sussex, Brighton, United Kingdom
  • 150School of Physics, University of Sydney, Sydney, Australia
  • 151Institute of Physics, Academia Sinica, Taipei, Taiwan
  • 152aE. Andronikashvili Institute of Physics, Iv. Javakhishvili Tbilisi State University, Tbilisi, Georgia
  • 152bHigh Energy Physics Institute, Tbilisi State University, Tbilisi, Georgia
  • 152cUniversity of Georgia, Tbilisi, Georgia
  • 153Department of Physics, Technion, Israel Institute of Technology, Haifa, Israel
  • 154Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
  • 155Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
  • 156International Center for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, Japan
  • 157Graduate School of Science and Technology, Tokyo Metropolitan University, Tokyo, Japan
  • 158Department of Physics, University of Toronto, Toronto, Ontario, Canada
  • 159aTRIUMF, Vancouver, British Columbia, Canada
  • 159bDepartment of Physics and Astronomy, York University, Toronto, Ontario, Canada
  • 160Division of Physics and Tomonaga Center for the History of the Universe, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
  • 161Department of Physics and Astronomy, Tufts University, Medford, Massachusetts, USA
  • 162Department of Physics and Astronomy, University of California Irvine, Irvine, California, USA
  • 163Department of Physics and Astronomy, University of Uppsala, Uppsala, Sweden
  • 164Department of Physics, University of Illinois, Urbana, Illinois, USA
  • 165Instituto de Física Corpuscular (IFIC), Centro Mixto Universidad de Valencia—CSIC, Valencia, Spain
  • 166Department of Physics, University of British Columbia, Vancouver, British Columbia, Canada
  • 167Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia, Canada
  • 168Fakultät für Physik und Astronomie, Julius-Maximilians-Universität Würzburg, Würzburg, Germany
  • 169Department of Physics, University of Warwick, Coventry, United Kingdom
  • 170Waseda University, Tokyo, Japan
  • 171Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, Israel
  • 172Department of Physics, University of Wisconsin, Madison WI, USA
  • 173Fakultät für Mathematik und Naturwissenschaften, Fachgruppe Physik, Bergische Universität Wuppertal, Wuppertal, Germany
  • 174Department of Physics, Yale University, New Haven, Connecticut, USA
  • 175Yerevan Physics Institute, Yerevan, Armenia

  • *Full author list given at the end of the Letter.
  • aDeceased.
  • bAlso at Department of Physics, King’s College London, London, United Kingdom.
  • cAssociated at Instituto de Fisica Teorica, IFT-UAM/CSIC, Madrid, Spain.
  • dAlso at Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan.
  • eAlso at Imam Mohammad Ibn Saud Islamic University, Riyadh, Saudi Arabia.
  • fAlso at Department of Physics, University of Thessaly, Volos, Greece.
  • gAlso at An-Najah National University, Nablus, Palestine.
  • hAlso at Department of Physics, University of Fribourg, Fribourg, Switzerland.
  • iAlso at Department of Physics, Westmont College, Santa Barbara, California, USA.
  • jAlso at Departament de Fisica de la Universitat Autonoma de Barcelona, Barcelona, Spain.
  • kAlso at University of Siena, Siena, Italy.
  • lAlso at Affiliated with an institute formerly covered by a cooperation agreement with CERN.
  • mAlso at The Collaborative Innovation Center of Quantum Matter (CICQM), Beijing, China.
  • nAlso at Faculty of Physics, Sofia University, “St. Kliment Ohridski”, Sofia, Bulgaria.
  • oAlso at Università di Napoli Parthenope, Napoli, Italy.
  • pAlso at Institute of Particle Physics (IPP), Canada.
  • qAlso at Department of Physics, Bolu Abant Izzet Baysal University, Bolu, Türkiye.
  • rAlso at Faculty of Physics, University of Bucharest, Romania.
  • sAlso at Borough of Manhattan Community College, City University of New York, New York, New York, USA.
  • tAlso at National Institute of Physics, University of the Philippines Diliman (Philippines), Quezon City, Philippines.
  • uAlso at TRIUMF, Vancouver, British Columbia, Canada.
  • vAlso at Universita degli Studi Link, Roma, Italy.
  • wAlso at Department of Financial and Management Engineering, University of the Aegean, Chios, Greece.
  • xAlso at University and INFN Torino, Torino, Italy.
  • yAlso at Institucio Catalana de Recerca i Estudis Avancats, ICREA, Barcelona, Spain.
  • zAlso at Henan University, Kaifeng, China.
  • aaAlso at Yeditepe University, Physics Department, Istanbul, Türkiye.
  • bbAlso at Institute of Theoretical Physics, Ilia State University, Tbilisi, Georgia.
  • ccAlso at CERN, Geneva, Switzerland.
  • ddAlso at Manhattan College, New York, New York, USA.
  • eeAlso at Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Thessaloniki, Greece.
  • ffAlso at Hellenic Open University, Patras, Greece.
  • ggAlso at Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, China.
  • hhAlso at Department of Physics, Stellenbosch University, South Africa.
  • iiAlso at School of Physics, University of the Witwatersrand, Johannesburg, South Africa.
  • jjAlso at Department of Physics, Ben Gurion University of the Negev, Beer Sheva, Israel.
  • kkAlso at University of Colorado Boulder, Department of Physics, Colorado, Boulder, USA.
  • llAlso at Département de Physique Nucléaire et Corpusculaire, Université de Genève, Genève, Switzerland.
  • mmAlso at Centre of Physics of the Universities of Minho and Porto (CF-UM-UP), Minho, Portugal.
  • nnAlso at Indian Institute of Technology (IIT), Jodhpur, India.
  • ooAlso at Institute for Nuclear Research and Nuclear Energy (INRNE) of the Bulgarian Academy of Sciences, Sofia, Bulgaria.
  • ppAlso at Washington College, Chestertown, Maryland, USA.
  • qqAlso at Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany.
  • rrAlso at Institute of Applied Physics, Mohammed VI Polytechnic University, Ben Guerir, Morocco.
  • ssAlso at Institute of Physics and Technology, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia.
  • ttAlso at Millennium Institute for Subatomic physics at high energy frontier (SAPHIR), Santiago, Chile.
  • uuAlso at University of Chinese Academy of Sciences (UCAS), Beijing, China.

Phys. Rev. Lett. 137, 111804 – Published 11 September, 2026

DOI: https://doi.org/10.1103/y1nh-1b82

Abstract

Entanglement is a key property of quantum systems. In this Letter the first measurements of quantum entanglement between spins in pairs of Z bosons are reported, using proton-proton collision data from the Large Hadron Collider (LHC) at center-of-mass energies of 13 and 13.6 TeV, recorded with the ATLAS detector. Measurements of angular observables sensitive to ZZ* spin-density-matrix elements in the HZZ*++ process yield coefficients C2,1,2,1=0.71±0.45 and C2,2,2,2=0.08±0.44, consistent with their Standard Model predictions. A complementary hypothesis test using the full angular distribution, and relying on several Standard Model assumptions in the decays, provides substantially higher sensitivity to quantum correlations and disfavors the separable-state hypothesis at a significance of 4.7 standard deviations (expected 4.9σ) relative to the entangled Standard Model hypothesis. These results provide strong evidence of quantum entanglement between massive bosons (spin qutrits) at the electroweak scale.

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