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Measurement of the Z-Boson Mass

R. Aaij38, A. S. W. Abdelmotteleb57, C. Abellan Beteta51, F. Abudinén57, T. Ackernley61, A. A. Adefisoye69, B. Adeva47, M. Adinolfi55, P. Adlarson84 et al. (LHCb Collaboration)

P. Adlarson84, C. Agapopoulou14, C. A. Aidala86, Z. Ajaltouni11, S. Akar11, K. Akiba38, P. Albicocco28, J. Albrecht19,b, F. Alessio49, Z. Aliouche63, P. Alvarez Cartelle56, R. Amalric16, S. Amato3, J. L. Amey55, Y. Amhis14, L. An6, L. Anderlini27, M. Andersson51, P. Andreola51, M. Andreotti26, A. Anelli31,49,c, D. Ao7, F. Archilli37,d, Z Areg69, M. Argenton26, S. Arguedas Cuendis9,49, A. Artamonov44, M. Artuso69, E. Aslanides13, R. Ataíde Da Silva50, M. Atzeni65, B. Audurier12, D. Bacher64, I. Bachiller Perea50, S. Bachmann22, M. Bachmayer50, J. J. Back57, P. Baladron Rodriguez47, V. Balagura15, A. Balboni26, W. Baldini26, L. Balzani19, H. Bao7, J. Baptista de Souza Leite61, 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. Bedeschi35, I. B. Bediaga2, N. A. Behling19, S. Belin47, K. Belous44, I. Belov29, I. Belyaev36, G. Benane13, G. Bencivenni28, E. Ben-Haim16, A. Berezhnoy44, R. Bernet51, S. Bernet Andres46, A. Bertolin33, C. Betancourt51, F. Betti59, J. Bex56, Ia. Bezshyiko51, O. Bezshyyko85, J. Bhom41, M. S. Bieker18, N. V. Biesuz26, P. Billoir16, A. Biolchini38, M. Birch62, F. C. R. Bishop10, A. Bitadze63, A. Bizzeti27,e, T. Blake57,f, F. Blanc50, J. E. Blank19, S. Blusk69, V. Bocharnikov44, J. A. Boelhauve19, O. Boente Garcia15, T. Boettcher68, A. Bohare59, A. Boldyrev44, C. S. Bolognani81, R. Bolzonella26, R. B. Bonacci1, N. Bondar44,49, A. Bordelius49, F. Borgato33,49, S. Borghi63, M. Borsato31,c, J. T. Borsuk82, E. Bottalico61, S. A. Bouchiba50, M. Bovill64, T. J. V. Bowcock61, A. Boyer49, C. Bozzi26, J. D. Brandenburg87, A. Brea Rodriguez50, N. Breer19, J. Brodzicka41, A. Brossa Gonzalo47,a, J. Brown61, D. Brundu32, E. Buchanan59, L. Buonincontri33,g, M. Burgos Marcos81, A. T. Burke63, C. Burr49, J. S. Butter56, J. Buytaert49, W. Byczynski49, S. Cadeddu32, H. Cai74, A. Caillet16, R. Calabrese26,h, S. Calderon Ramirez9, L. Calefice45, S. Cali28, M. Calvi31,c, M. Calvo Gomez46, P. Camargo Magalhaes2,i, J. I. Cambon Bouzas47, P. Campana28, D. H. Campora Perez81, A. F. Campoverde Quezada7, S. Capelli31, L. Capriotti26, R. Caravaca-Mora9, A. Carbone25,j, L. Carcedo Salgado47, R. Cardinale29,k, A. Cardini32, P. Carniti31, L. Carus22, A. Casais Vidal65, R. Caspary22, G. Casse61, M. Cattaneo49, G. Cavallero26,49, V. Cavallini26,h, S. Celani22, S. Cesare30,l, A. J. Chadwick61, I. Chahrour86, H. Chang4,m, M. Charles16, Ph. Charpentier49, E. Chatzianagnostou38, M. Chefdeville10, C. Chen56, S. Chen5, Z. Chen7, A. Chernov41, S. Chernyshenko53, X. Chiotopoulos81, V. Chobanova83, M. Chrzaszcz41, A. Chubykin44, V. Chulikov28,36, P. Ciambrone28, X. Cid Vidal47, G. Ciezarek49, P. Cifra38, P. E. L. Clarke59, M. Clemencic49, H. V. Cliff56, J. Closier49, C. Cocha Toapaxi22, V. Coco49, J. Cogan13, E. Cogneras11, L. Cojocariu43, S. Collaviti50, P. Collins49, T. Colombo49, M. Colonna19, A. Comerma-Montells45, L. Congedo24, A. Contu32, N. Cooke60, C. Coronel66, I. Corredoira12, A. Correia16, G. Corti49, J. Cottee Meldrum55, B. Couturier49, D. C. Craik51, M. Cruz Torres2,n, E. Curras Rivera50, R. Currie59, C. L. Da Silva68, S. Dadabaev44, L. Dai71, X. Dai4, E. Dall’Occo49, J. Dalseno83, C. D’Ambrosio62, J. Daniel11, P. d’Argent24, G. Darze3, A. Davidson57, J. E. Davies63, O. De Aguiar Francisco63, C. De Angelis32,o, F. De Benedetti49, J. de Boer38, K. De Bruyn80, S. De Capua63, M. De Cian63, U. De Freitas Carneiro Da Graca2,p, E. De Lucia28, J. M. De Miranda2, L. De Paula3, M. De Serio24,q, P. De Simone28, F. De Vellis19, J. A. de Vries81, F. Debernardis24, D. Decamp10, S. Dekkers1, L. Del Buono16, B. Delaney65, H.-P. Dembinski19, J. Deng8, V. Denysenko51, O. Deschamps11, F. Dettori32,o, B. Dey78, P. Di Nezza28, I. Diachkov44, S. Didenko44, S. Ding69, Y. Ding50, L. Dittmann22, V. Dobishuk53, A. D. Docheva60, C. Dong4,m, A. M. Donohoe23, F. Dordei32, A. C. dos Reis2, A. D. Dowling69, W. Duan72, P. Duda82, M. W. Dudek41, L. Dufour49, V. Duk34, P. Durante49, M. M. Duras82, J. M. Durham68, O. D. Durmus78, A. Dziurda41, A. Dzyuba44, S. Easo58, E. Eckstein18, U. Egede1, A. Egorychev44, V. Egorychev44, S. Eisenhardt59, E. Ejopu63, L. Eklund84, M. Elashri66, J. Ellbracht19, S. Ely62, A. Ene43, J. Eschle69, S. Esen22, T. Evans38, F. Fabiano32, S. Faghih66, L. N. Falcao2, B. Fang7, R. Fantechi35, L. Fantini34,49,r, M. Faria50, K. Farmer59, D. Fazzini31,c, L. Felkowski82, M. Feng5,7, M. Feo19, A. Fernandez Casani48, M. Fernandez Gomez47, A. D. Fernez67, F. Ferrari25,j, F. Ferreira Rodrigues3, M. Ferrillo51, M. Ferro-Luzzi49, S. Filippov44, R. A. Fini24, M. Fiorini26,h, M. Firlej40, K. L. Fischer64, D. S. Fitzgerald86, C. Fitzpatrick63, T. Fiutowski40, F. Fleuret15, A. Fomin52, M. Fontana25, L. F. Foreman63, R. Forty49, D. Foulds-Holt59, V. Franco Lima3, M. Franco Sevilla67, M. Frank49, E. Franzoso26,h, G. Frau63, C. Frei49, D. A. Friday63, J. Fu7, Q. Führing19,56,b, Y. Fujii1, T. Fulghesu13, E. Gabriel38, G. Galati24, M. D. Galati38, A. Gallas Torreira47, D. Galli25,j, S. Gambetta59, M. Gandelman3, P. Gandini30, B. Ganie63, H. Gao7, R. Gao64, T. Q. Gao56, Y. Gao8, Y. Gao6, Y. Gao8, L. M. Garcia Martin50, P. Garcia Moreno45, J. García Pardiñas65, P. Gardner67, K. G. Garg8, L. Garrido45, C. Gaspar49, A. Gavrikov33, L. L. Gerken19, E. Gersabeck20, M. Gersabeck20, T. Gershon57, S. Ghizzo29,k, Z. Ghorbanimoghaddam55, L. Giambastiani33,g, F. I. Giasemis16,s, V. Gibson56, H. K. Giemza42, A. L. Gilman64, M. Giovannetti28, A. Gioventù45, L. Girardey63,58, M. A. Giza41, F. C. Glaser14,22, V. V. Gligorov16, C. Göbel70, L. Golinka-Bezshyyko85, E. Golobardes46, D. Golubkov44, A. Golutvin62,49, S. Gomez Fernandez45, W. Gomulka40, F. Goncalves Abrantes64, M. Goncerz41, G. Gong4,m, J. A. Gooding19, I. V. Gorelov44, C. Gotti31, E. Govorkova65, J. P. Grabowski18, L. A. Granado Cardoso49, E. Graugés45, E. Graverini50,t, L. Grazette57, G. Graziani27, A. T. Grecu43, L. M. Greeven38, N. A. Grieser66, L. Grillo60, S. Gromov44, C. Gu15, M. Guarise26, L. Guerry11, V. Guliaeva44, P. A. Günther22, A.-K. Guseinov50, E. Gushchin44, Y. Guz6,49, T. Gys49, K. Habermann18, T. Hadavizadeh1, C. Hadjivasiliou67, G. Haefeli50, C. Haen49, G. Hallett57, P. M. Hamilton67, J. Hammerich61, Q. Han33, X. Han22,49, S. Hansmann-Menzemer22, L. Hao7, N. Harnew64, T. H. Harris1, M. Hartmann14, S. Hashmi40, J. He7,u, F. Hemmer49, C. Henderson66, R. D. L. Henderson1, A. M. Hennequin49, K. Hennessy61, L. Henry50, J. Herd62, P. Herrero Gascon22, J. Heuel17, A. Hicheur3, G. Hijano Mendizabal51, J. Horswill63, R. Hou8, Y. Hou11, N. Howarth61, J. Hu72, W. Hu7, X. Hu4,m, W. Hulsbergen38, R. J. Hunter57, M. Hushchyn44, D. Hutchcroft61, M. Idzik40, D. Ilin44, P. Ilten66, A. Iniukhin44, A. Ishteev44, K. Ivshin44, H. Jage17, S. J. Jaimes Elles76,49,48, S. Jakobsen49, E. Jans38, B. K. Jashal48, A. Jawahery67, V. Jevtic19, E. Jiang67, X. Jiang5,7, Y. Jiang7, Y. J. Jiang6, M. John64, A. John Rubesh Rajan23, D. Johnson54, C. R. Jones56, T. P. Jones57, S. Joshi42, B. Jost49, J. Juan Castella56, N. Jurik49, I. Juszczak41, D. Kaminaris50, S. Kandybei52, M. Kane59, Y. Kang4,m, C. Kar11, M. Karacson49, D. Karpenkov44, A. Kauniskangas50, J. W. Kautz66, M. K. Kazanecki41, F. Keizer49, M. Kenzie56, T. Ketel38, B. Khanji69, A. Kharisova44, S. Kholodenko35,49, G. Khreich14, T. Kirn17, V. S. Kirsebom31,c, O. Kitouni65, S. Klaver39, N. Kleijne35,v, K. Klimaszewski42, M. R. Kmiec42, S. Koliiev53, L. Kolk19, A. Konoplyannikov6, P. Kopciewicz49, P. Koppenburg38, A. Korchin52, M. Korolev44, I. Kostiuk38, O. Kot53, S. Kotriakhova, E. Kowalczyk67, A. Kozachuk44, P. Kravchenko44, L. Kravchuk44, M. Kreps57, P. Krokovny44, W. Krupa69, W. Krzemien42, O. Kshyvanskyi53, S. Kubis82, M. Kucharczyk41, V. Kudryavtsev44, E. Kulikova44, A. Kupsc84, V. Kushnir52, B. Kutsenko13, I. Kyryllin52, D. Lacarrere49, P. Laguarta Gonzalez45, A. Lai32, A. 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  • 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, Saclay, France, 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
  • 16LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, 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, Massachusetts, USA
  • 66University of Cincinnati, Cincinnati, Ohio, USA
  • 67University of Maryland, College Park, Maryland, USA
  • 68Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA
  • 69Syracuse University, Syracuse, New York, USA
  • 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)
  • 71School of Physics and Electronics, Hunan University, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
  • 72Guangdong Provincial Key Laboratory of Nuclear Science, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Institute of Quantum Matter, South China Normal University, Guangzhou, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
  • 73Lanzhou University, Lanzhou, China (associated with Institute of High Energy Physics (IHEP), Beijing, China)
  • 74School of Physics and Technology, Wuhan University, Wuhan, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
  • 75Henan Normal University, Xinxiang, China (associated with Institution No. 8)
  • 76Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France)
  • 77Ruhr Universitaet Bochum, Fakultaet f. Physik und Astronomie, Bochum, Germany (associated with Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany)
  • 78Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland)
  • 79Faculty of Physics, Vilnius University, Vilnius, Lithuania (associated with Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany)
  • 80Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
  • 81Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
  • 82Tadeusz Kosciuszko Cracow University of Technology, Cracow, Poland (associated with Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland)
  • 83Universidade da Coruña, A Coruña, Spain (associated with La Salle, Universitat Ramon Llull, Barcelona, Spain)
  • 84Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom)
  • 85Taras Schevchenko University of Kyiv, Faculty of Physics, Kyiv, Ukraine (associated with Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France)
  • 86University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA)
  • 87Ohio 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.
  • 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 Padova, Padova, Italy.
  • hAlso at Università di Ferrara, Ferrara, Italy.
  • iAlso at Facultad de Ciencias Fisicas, Madrid, Spain.
  • jAlso at Università di Bologna, Bologna, Italy.
  • kAlso at Università di Genova, Genova, 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 Scuola Normale Superiore, Pisa, Italy.
  • wAlso at Università di Firenze, Firenze, Italy.
  • xAlso at Università di Bergamo, Bergamo, Italy.
  • yAlso at Universidad de Ingeniería y Tecnología (UTEC), Lima, Peru.
  • zAlso at Università di Siena, Siena, Italy.
  • aaAlso at Università della Basilicata, Potenza, Italy.
  • bbAlso at Universidad de Alcalá, Alcalá de Henares, Spain.
  • ccAlso at Università di Urbino, Urbino, Italy.

Phys. Rev. Lett. 135, 161802 – Published 17 October, 2025

DOI: https://doi.org/10.1103/ydn7-qx1d

Abstract

The first dedicated Z-boson mass measurement at the LHC with Z→μ+μ− decays is reported. The dataset uses proton-proton collisions at a center-of-mass energy of 13 TeV, recorded in 2016 by the LHCb experiment, and corresponds to an integrated luminosity of 1.7  fb−1. A template fit to the μ+μ− mass distribution yields the following result for the Z-boson mass: mZ=91,185.7±8.3±3.9  MeV, where the first uncertainty is statistical and the second systematic. This result is consistent with previous measurements and predictions from global electroweak fits.

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