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Article
Report number arXiv:2103.11769 ; LHCb-PAPER-2021-004 ; CERN-EP-2021-042
Title Test of lepton universality in beauty-quark decays
Related titleAddendum: Test of lepton universality in beauty-quark decays
Author(s)

Aaij, Roel (NIKHEF, Amsterdam) ; Abellán Beteta, Carlos (Zurich U.) ; Ackernley, Thomas (Liverpool U.) ; Adeva, Bernardo (U. Santiago de Compostela (main)) ; Adinolfi, Marco (Bristol U.) ; Afsharnia, Hossein (Clermont-Ferrand U.) ; Aidala, Christine Angela (U. Michigan, Ann Arbor) ; Aiola, Salvatore (INFN, Milan) ; Ajaltouni, Ziad (Clermont-Ferrand U.) ; Akar, Simon (Cincinnati U.) ; Albrecht, Johannes (Tech. U., Dortmund (main)) ; Alessio, Federico (CERN) ; Alexander, Michael (Glasgow U.) ; Alfonso Albero, Alejandro (U. Barcelona (main)) ; Aliouche, Zakariya (Manchester U.) ; Alkhazov, Georgy (St. Petersburg, INP) ; Alvarez Cartelle, Paula (Cambridge U.) ; Amato, Sandra (Rio de Janeiro Federal U.) ; Amhis, Yasmine (IJCLab, Orsay) ; An, Liupan (CERN) ; Anderlini, Lucio (INFN, Florence) ; Andreianov, Aleksei (St. Petersburg, INP) ; Andreotti, Mirco (INFN, Ferrara) ; Archilli, Flavio (Heidelberg U.) ; Artamonov, Alexander (Serpukhov, IHEP) ; Artuso, Marina (Syracuse U.) ; Arzymatov, Kenenbek (Yandex Sch. Data Anal., Moscow) ; Aslanides, Elie (Marseille, CPPM) ; Atzeni, Michele (Zurich U.) ; Audurier, Benjamin (Ecole Polytechnique) ; Bachmann, Sebastian (Heidelberg U.) ; Bachmayer, Marie (Ecole Polytechnique, Lausanne) ; Back, John (Warwick U.) ; Baladron Rodriguez, Pablo (U. Santiago de Compostela (main)) ; Balagura, Vladislav (Ecole Polytechnique) ; Baldini, Wander (INFN, Ferrara) ; Baptista Leite, Juan (Rio de Janeiro, CBPF) ; Barlow, Roger (Manchester U.) ; Barsuk, Sergey (IJCLab, Orsay) ; Barter, William (Imperial Coll., London) ; Bartolini, Matteo (INFN, Genoa) ; Baryshnikov, Fedor (Natl. U. Sci. Tech., Moscow) ; Basels, Jan-Marc (Aachen, Tech. Hochsch.) ; Bassi, Giovanni (INFN, Pisa) ; Batsukh, Baasansuren (Syracuse U.) ; Battig, Alexander (Tech. U., Dortmund (main)) ; Bay, Aurelio (Ecole Polytechnique, Lausanne) ; Becker, Maik (Tech. U., Dortmund (main)) ; Bedeschi, Franco (INFN, Pisa) ; Bediaga, Ignacio (Rio de Janeiro, CBPF) ; Beiter, Andrew (Syracuse U.) ; Belavin, Vladislav (Yandex Sch. Data Anal., Moscow) ; Belin, Samuel (INFN, Cagliari) ; Bellee, Violaine (Ecole Polytechnique, Lausanne) ; Belous, Konstantin (Serpukhov, IHEP) ; Belov, Ilia (SINP, Moscow) ; Belyaev, Ivan (Moscow, ITEP) ; Bencivenni, Giovanni (Frascati) ; Ben-Haim, Eli (Paris U., VI-VII) ; Berezhnoy, Alexander (SINP, Moscow) ; Bernet, Roland (Zurich U.) ; Berninghoff, Daniel (Heidelberg U.) ; Bernstein, Harris Conan (Syracuse U.) ; Bertella, Claudia (CERN) ; Bertolin, Alessandro (INFN, Padua) ; Betancourt, Christopher (Zurich U.) ; Betti, Federico (CERN) ; Bezshyiko, Ia. (Zurich U.) ; Bezshyiko, Iaroslava (Zurich U.) ; Bhasin, Srishti (Bristol U.) ; Bhom, Jihyun (Cracow, INP) ; Bian, Lingzhu (Wuhan U.) ; Bieker, Martin Stefan (Tech. U., Dortmund (main)) ; Bifani, Simone (Birmingham U.) ; Billoir, Pierre (Paris U., VI-VII) ; Birch, Matthew (Imperial Coll., London) ; Bishop, Fionn Caitlin Ros (Cambridge U.) ; Bitadze, Alexander (Manchester U.) ; Bizzeti, Andrea (INFN, Florence ; U. Modena (main)) ; Bjørn, Mikkel (Oxford U.) ; Blago, Michele Piero (CERN) ; Blake, Thomas (Warwick U.) ; Blanc, Frederic (Ecole Polytechnique, Lausanne) ; Blusk, Steven (Syracuse U.) ; Bobulska, Dana (Glasgow U.) ; Boelhauve, Julian Alexander (Tech. U., Dortmund (main)) ; Boente Garcia, Oscar (U. Santiago de Compostela (main)) ; Boettcher, Thomas (MIT) ; Boldyrev, Alexey (Higher Sch. of Economics, Moscow) ; Bondar, Alexander (Novosibirsk, IYF) ; Bondar, Nikolay (St. Petersburg, INP ; CERN) ; Borghi, Silvia (Manchester U.) ; Borisyak, Maxim (Yandex Sch. Data Anal., Moscow) ; Borsato, Martino (Heidelberg U.) ; Borsuk, Jozef Tomasz (Cracow, INP) ; Bouchiba, Sonia Amina (Ecole Polytechnique, Lausanne) ; Bowcock, Themistocles (Liverpool U.) ; Boyer, Alexandre (CERN) ; Bozzi, Concezio (INFN, Ferrara) ; Bradley, Matthew John (Imperial Coll., London) ; Braun, Svende (Maryland U., College Park) ; Brea Rodriguez, Alexandre (U. Santiago de Compostela (main)) ; Brodski, Michael (CERN) ; Brodzicka, Jolanta (Cracow, INP) ; Brossa Gonzalo, Arnau (Warwick U.) ; Brundu, Davide (INFN, Cagliari) ; Buonaura, Annarita (Zurich U.) ; Burr, Christopher (CERN) ; Bursche, Albert (South China Normal U.) ; Butkevich, Anatoly (Moscow, INR) ; Butter, Jordy Sebastiaan (NIKHEF, Amsterdam) ; Buytaert, Jan (CERN) ; Byczynski, Wiktor (CERN) ; Cadeddu, Sandro (INFN, Cagliari) ; Cai, Hao (Wuhan U.) ; Calabrese, Roberto (INFN, Ferrara ; Ferrara U.) ; Calefice, Lukas (Tech. U., Dortmund (main) ; Paris U., VI-VII) ; Calero Diaz, Liliet (Frascati) ; Cali, Stefano (Frascati) ; Calladine, Ryan (Birmingham U.) ; Calvi, Marta (INFN, Milan Bicocca ; Milan Bicocca U.) ; Calvo Gomez, Miriam (Ramon Llull U., Barcelona) ; Camargo Magalhaes, Patricia (Bristol U.) ; Camboni, Alessandro (U. Barcelona (main) ; Ramon Llull U., Barcelona) ; Campana, Pierluigi (Frascati) ; Campoverde Quezada, Angel Fernando (Beijing, GUCAS) ; Capelli, Simone (INFN, Milan Bicocca ; Milan Bicocca U.) ; Capriotti, Lorenzo (INFN, Bologna ; Bologna U.) ; Carbone, Angelo (INFN, Bologna ; Bologna U.) ; Carboni, Giovanni (INFN, Rome2) ; Cardinale, Roberta (INFN, Genoa) ; Cardini, Alessandro (INFN, Cagliari) ; Carli, Ina (Beijing, Inst. High Energy Phys.) ; Carniti, Paolo (INFN, Milan Bicocca ; Milan Bicocca U.) ; Carus, Leon David (Aachen, Tech. Hochsch.) ; Carvalho Akiba, Kazuyoshi (NIKHEF, Amsterdam) ; Casais Vidal, Adrian (U. Santiago de Compostela (main)) ; Casse, Gianluigi (Liverpool U.) ; Cattaneo, Marco (CERN) ; Cavallero, Giovanni (CERN) ; Celani, Sara (Ecole Polytechnique, Lausanne) ; Cerasoli, Jacopo (Marseille, CPPM) ; Chadwick, Abbie Jane (Liverpool U.) ; Chapman, Matthew George (Bristol U.) ; Charles, Matthew (Paris U., VI-VII) ; Charpentier, Philippe (CERN) ; Charpentier, Ph. (CERN) ; Chatzikonstantinidis, Georgios (Birmingham U.) ; Chavez Barajas, Carlos Alberto (Liverpool U.) ; Chefdeville, Maximilien (Annecy, LAPP) ; Chen, Chen (Tsinghua U., Beijing, CHEP) ; Chen, Shanzhen (Beijing, Inst. High Energy Phys.) ; Chernov, Aleksei (Cracow, INP) ; Chobanova, Veronika (U. Santiago de Compostela (main)) ; Cholak, Serhii (Ecole Polytechnique, Lausanne) ; Chrzaszcz, Marcin (Cracow, INP) ; Chubykin, Alexsei (St. Petersburg, INP) ; Chulikov, Vladimir (St. Petersburg, INP) ; Ciambrone, Paolo (Frascati) ; Cicala, Maria Flavia (Warwick U.) ; Cid Vidal, Xabier (U. Santiago de Compostela (main)) ; Ciezarek, Gregory (CERN) ; Clarke, P.E. L. (Edinburgh U.) ; Clemencic, Marco (CERN) ; Cliff, Harry (Cambridge U.) ; Closier, Joel (CERN) ; Cobbledick, John Leslie (Manchester U.) ; Coco, Victor (CERN) ; Coelho, Joao A.B. (IJCLab, Orsay) ; Cogan, Julien (Marseille, CPPM) ; Cogneras, Eric (Clermont-Ferrand U.) ; Cojocariu, Lucian (Bucharest, IFIN-HH) ; Collins, Paula (CERN) ; Colombo, Tommaso (CERN) ; Congedo, Liliana (INFN, Bari ; Bari U.) ; Contu, Andrea (INFN, Cagliari) ; Cooke, Naomi (Birmingham U.) ; Coombs, George (Glasgow U.) ; Corti, Gloria (CERN) ; Costa Sobral, Cayo Mar (Warwick U.) ; Couturier, Benjamin (CERN) ; Craik, Daniel Charles (MIT) ; Crkovská, Jana (Los Alamos) ; Cruz Torres, Melissa Maria (Rio de Janeiro, CBPF) ; Currie, Robert (Edinburgh U.) ; Da Silva, Cesar Luiz (Los Alamos) ; Dall'Occo, Elena (Tech. U., Dortmund (main)) ; Dalseno, Jeremy (U. Santiago de Compostela (main)) ; D'Ambrosio, Carmelo (CERN) ; Danilina, Anna (Moscow, ITEP) ; d'Argent, Philippe (CERN) ; Davis, Adam (Manchester U.) ; De Aguiar Francisco, Oscar (Manchester U.) ; De Bruyn, Kristof (U. Groningen, VSI) ; De Capua, Stefano (Manchester U.) ; De Cian, Michel (Ecole Polytechnique, Lausanne) ; De Miranda, Jussara (Rio de Janeiro, CBPF) ; De Paula, Leandro (Rio de Janeiro Federal U.) ; De Serio, Marilisa (INFN, Bari ; Bari U.) ; De Simone, Dario (Zurich U.) ; De Simone, Patrizia (Frascati) ; de Vries, Jacco (Maastricht U.) ; Dean, Cameron Thomas (Los Alamos) ; Decamp, Daniel (Annecy, LAPP) ; Del Buono, Luigi (Paris U., VI-VII) ; Delaney, Blaise (Cambridge U.) ; Dembinski, Hans Peter (Tech. U., Dortmund (main)) ; Dendek, Adam (AGH-UST, Cracow) ; Denysenko, Vadym (Zurich U.) ; Derkach, Denis (Higher Sch. of Economics, Moscow) ; Deschamps, Olivier (Clermont-Ferrand U.) ; Desse, Fabrice (IJCLab, Orsay) ; Dettori, Francesco (INFN, Cagliari ; Cagliari U.) ; Dey, Biplab (Wuhan U.) ; Di Nezza, Pasquale (Frascati) ; Didenko, Sergey (Natl. U. Sci. Tech., Moscow) ; Dieste Maronas, Lorena (U. Santiago de Compostela (main)) ; Dijkstra, Hans (CERN) ; Dobishuk, Vasyl (Kiev, INR) ; Donohoe, Amanda May (University Coll., Dublin) ; Dordei, Francesca (INFN, Cagliari) ; dos Reis, Alberto (Rio de Janeiro, CBPF) ; Douglas, Lauren (Glasgow U.) ; Dovbnya, Anatoliy (Kharkov, KIPT) ; Downes, Anthony Gavin (Annecy, LAPP) ; Dreimanis, Karlis (Liverpool U.) ; Dudek, Maciej Wojciech (Cracow, INP) ; Dufour, Laurent (CERN) ; Duk, Viacheslav (INFN, Perugia) ; Durante, Paolo (CERN) ; Durham, John Matthew (Los Alamos) ; Dutta, Deepanwita (Manchester U.) ; Dziurda, Agnieszka (Cracow, INP) ; Dzyuba, Alexey (St. Petersburg, INP) ; Easo, Sajan (Rutherford) ; Egede, Ulrik (Monash U.) ; Egorychev, Victor (Moscow, ITEP) ; Eidelman, Semen (Novosibirsk, IYF ; Novosibirsk State U.) ; Eisenhardt, Stephan (Edinburgh U.) ; Ek-In, Surapat (Ecole Polytechnique, Lausanne) ; Eklund, Lars (Glasgow U.) ; Ely, Scott (Syracuse U.) ; Ene, Alexandru (Bucharest, IFIN-HH) ; Epple, Eliane (Los Alamos) ; Escher, Stephan (Aachen, Tech. Hochsch.) ; Eschle, Jonas Nathanael (Zurich U.) ; Esen, Sevda (Paris U., VI-VII) ; Evans, Timothy (CERN) ; Falabella, Antonio (INFN, Bologna) ; Fan, Jingzhou (Tsinghua U., Beijing, CHEP) ; Fan, Yanting (Beijing, GUCAS) ; Fang, Bo (Wuhan U.) ; Farry, Stephen (Liverpool U.) ; Fazzini, Davide (INFN, Milan Bicocca ; Milan Bicocca U.) ; Féo, Mauricio (CERN) ; Fernandez Prieto, Antonio (U. Santiago de Compostela (main)) ; Fernandez-tenllado Arribas, Jose Maria (U. Barcelona (main)) ; Fernez, Alex Daniel (Maryland U., College Park) ; Ferrari, Fabio (INFN, Bologna ; Bologna U.) ; Ferreira Lopes, Lino (Ecole Polytechnique, Lausanne) ; Ferreira Rodrigues, Fernando (Rio de Janeiro Federal U.) ; Ferreres Sole, Silvia (NIKHEF, Amsterdam) ; Ferrillo, Martina (Zurich U.) ; Ferro-Luzzi, Massimiliano (CERN) ; Filippov, Sergey (Moscow, INR) ; Fini, Rosa Anna (INFN, Bari) ; Fiorini, Massimiliano (INFN, Ferrara ; Ferrara U.) ; Firlej, Miroslaw (AGH-UST, Cracow) ; Fischer, Kamil Leszek (Oxford U.) ; Fischer, K.M. (Oxford U.) ; Fitzgerald, Dillon (U. Michigan, Ann Arbor) ; Fitzpatrick, Conor (Manchester U.) ; Fiutowski, Tomasz (AGH-UST, Cracow) ; Fleuret, Frederic (Ecole Polytechnique) ; Fontana, Marianna (Paris U., VI-VII) ; Fontanelli, Flavio (INFN, Genoa ; Genoa U.) ; Forty, Roger (CERN) ; Franco Lima, Vinicius (Liverpool U.) ; Franco Sevilla, Manuel (Maryland U., College Park) ; Frank, Markus (CERN) ; Franzoso, Edoardo (INFN, Ferrara) ; Frau, Giulia (Heidelberg U.) ; Frei, Christoph (CERN) ; Friday, David Anthony (Glasgow U.) ; Fu, Jinlin (INFN, Milan) ; Fuehring, Quentin (Tech. U., Dortmund (main)) ; Funk, Wolfgang (CERN) ; Gabriel, Emmy (NIKHEF, Amsterdam) ; Gaintseva, Tatiana (Yandex Sch. Data Anal., Moscow) ; Gallas Torreira, Abraham (U. Santiago de Compostela (main)) ; Galli, Domenico (INFN, Bologna ; Bologna U.) ; Gambetta, Silvia (Edinburgh U. ; CERN) ; Gan, Yuyue (Tsinghua U., Beijing, CHEP) ; Gandelman, Miriam (Rio de Janeiro Federal U.) ; Gandini, Paolo (INFN, Milan) ; Gao, Yuanning (Peking U., SKLNPT) ; Garau, Michela (INFN, Cagliari) ; Garcia Martin, Luis Miguel (Warwick U.) ; Garcia Moreno, Paula (U. Barcelona (main)) ; García Pardiñas, Julián (INFN, Milan Bicocca ; Milan Bicocca U.) ; Garcia Plana, Beatriz (U. Santiago de Compostela (main)) ; Garcia Rosales, Felipe Andres (Ecole Polytechnique) ; Garrido, Lluis (U. Barcelona (main)) ; Gaspar, Clara (CERN) ; Geertsema, Robbert Erik (NIKHEF, Amsterdam) ; Gerick, David (Heidelberg U.) ; Gerken, Louis Lenard (Tech. U., Dortmund (main)) ; Gersabeck, Evelina (Manchester U.) ; Gersabeck, Marco (Manchester U.) ; Gershon, Timothy (Warwick U.) ; Gerstel, Dawid (Marseille, CPPM) ; Ghez, Philippe (Annecy, LAPP) ; Ghez, Ph. (Annecy, LAPP) ; Gibson, Valerie (Cambridge U.) ; Giemza, Henryk Karol (NCBJ, Swierk) ; Giovannetti, Matteo (Frascati ; Rome U., Tor Vergata) ; Gioventù, Alessandra (U. Santiago de Compostela (main)) ; Gironella Gironell, Pere (U. Barcelona (main)) ; Giubega, Lavinia-Helena (Bucharest, IFIN-HH) ; Giugliano, Carmen (INFN, Ferrara ; CERN ; Ferrara U.) ; Gizdov, Konstantin (Edinburgh U.) ; Gkougkousis, Evangelos Leonidas (CERN) ; Gligorov, Vladimir (Paris U., VI-VII) ; Göbel, Carla (Rio de Janeiro, Pont. U. Catol.) ; Golobardes, Elisabet (Ramon Llull U., Barcelona) ; Golubkov, Dmitry (Moscow, ITEP) ; Golutvin, Andrey (Imperial Coll., London ; Natl. U. Sci. Tech., Moscow) ; Gomes, Alvaro (Rio de Janeiro, CBPF ; UFTM, Uberaba) ; Gomez Fernandez, Sergio (U. Barcelona (main)) ; Goncalves Abrantes, Fernanda (Oxford U.) ; Goncerz, Mateusz (Cracow, INP) ; Gong, Guanghua (Tsinghua U., Beijing, CHEP) ; Gorbounov, Petr (Moscow, ITEP) ; Gorelov, Igor Vladimirovich (SINP, Moscow) ; Gotti, Claudio (INFN, Milan Bicocca) ; Govorkova, Ekaterina (CERN) ; Grabowski, Jascha Peter (Heidelberg U.) ; Grammatico, Thomas (Paris U., VI-VII) ; Granado Cardoso, Luis Alberto (CERN) ; Graugés, Eugeni (U. Barcelona (main)) ; Graverini, Elena (Ecole Polytechnique, Lausanne) ; Graziani, Giacomo (INFN, Florence) ; Grecu, Alexandru (Bucharest, IFIN-HH) ; Greeven, Lex Marinus (NIKHEF, Amsterdam) ; Griffith, Peter (INFN, Ferrara ; Ferrara U.) ; Grillo, Lucia (Manchester U.) ; Gromov, Sergey (Natl. U. Sci. Tech., Moscow) ; Gruberg Cazon, Barak Raimond (Oxford U.) ; Gu, Chenxi (Tsinghua U., Beijing, CHEP) ; Guarise, Marco (INFN, Ferrara) ; Günther, Paul Andre (Heidelberg U.) ; Gushchin, Evgeny (Moscow, INR) ; Guth, Andreas (Aachen, Tech. Hochsch.) ; Guz, Yury (Serpukhov, IHEP) ; Gys, Thierry (CERN) ; Hadavizadeh, Thomas (Monash U.) ; Haefeli, Guido (Ecole Polytechnique, Lausanne) ; Haen, Christophe (CERN) ; Haimberger, Jakob (CERN) ; Halewood-leagas, Tabitha (Liverpool U.) ; Hamilton, Phoebe Meredith (Maryland U., College Park) ; Hammerich, Jan Patrick (Liverpool U.) ; Han, Qundong (CCNU, Wuhan, Inst. Part. Phys.) ; Han, Xiaoxue (Heidelberg U.) ; Hancock, Thomas Henry (Oxford U.) ; Hansmann-Menzemer, Stephanie (Heidelberg U.) ; Harnew, Neville (Oxford U.) ; Harrison, Thomas (Liverpool U.) ; Hasse, Christoph (CERN) ; Hatch, Mark (CERN) ; He, Jibo (Beijing, GUCAS) ; Hecker, Malte (Imperial Coll., London) ; Heijhoff, Kevin (NIKHEF, Amsterdam) ; Heinicke, Kevin (Tech. U., Dortmund (main)) ; Hennequin, Arthur Marius (CERN) ; Hennessy, Karol (Liverpool U.) ; Henry, Louis (INFN, Milan ; Valencia U., IFIC) ; Heuel, Johannes (Aachen, Tech. Hochsch.) ; Hicheur, Adlène (Rio de Janeiro Federal U.) ; Hill, Donal (Ecole Polytechnique, Lausanne) ; Hilton, Martha (Manchester U.) ; Hollitt, Sophie Elizabeth (Tech. U., Dortmund (main)) ; Hu, Jiangqiao (Heidelberg U.) ; Hu, Jifeng (South China Normal U.) ; Hu, Wenhua (CCNU, Wuhan, Inst. Part. Phys.) ; Huang, Wenqian (Beijing, GUCAS) ; Huang, Xiaotao (Wuhan U.) ; Hulsbergen, Wouter (NIKHEF, Amsterdam) ; Hunter, Ross John (Warwick U.) ; Hushchyn, Mikhail (Higher Sch. of Economics, Moscow) ; Hutchcroft, David (Liverpool U.) ; Hynds, Daniel (NIKHEF, Amsterdam) ; Ibis, Philipp (Tech. U., Dortmund (main)) ; Idzik, Marek (AGH-UST, Cracow) ; Ilin, Dmitrii (St. Petersburg, INP) ; Ilten, Philip (Cincinnati U.) ; Inglessi, Alexander (St. Petersburg, INP) ; Ishteev, Artur (Natl. U. Sci. Tech., Moscow) ; Ivshin, Kuzma (St. Petersburg, INP) ; Jacobsson, Richard (CERN) ; Jakobsen, Sune (CERN) ; Jans, Eddy (NIKHEF, Amsterdam) ; Jashal, Brij Kishor (Valencia U., IFIC) ; Jawahery, Abolhassan (Maryland U., College Park) ; Jevtic, Vukan (Tech. U., Dortmund (main)) ; Jezabek, Marek (Cracow, INP) ; Jiang, Feng (Tsinghua U., Beijing, CHEP) ; John, Malcolm (Oxford U.) ; Johnson, Daniel (CERN) ; Jones, Christopher (Cambridge U.) ; Jones, Thomas Peter (Warwick U.) ; Jost, Beat (CERN) ; Jurik, Nathan (CERN) ; Kandybei, Sergii (Kharkov, KIPT) ; Kang, Youen (Tsinghua U., Beijing, CHEP) ; Karacson, Matthias (CERN) ; Karpov, Maksim (Higher Sch. of Economics, Moscow) ; Keizer, Floris (CERN) ; Kenzie, Matthew (Warwick U.) ; Ketel, Tjeerd (NIKHEF, Amsterdam ; Vrije U., Amsterdam) ; Khanji, Basem (Tech. U., Dortmund (main)) ; Kharisova, Anastasiia (Tomsk Polytechnic U.) ; Kholodenko, Sergei (Serpukhov, IHEP) ; Kirn, Thomas (Aachen, Tech. Hochsch.) ; Kirsebom, Veronica Soelund (Ecole Polytechnique, Lausanne) ; Kitouni, Ouail (MIT) ; Klaver, Suzanne (NIKHEF, Amsterdam) ; Klimaszewski, Konrad (NCBJ, Swierk) ; Koliiev, Serhii (Kiev, INR) ; Kondybayeva, Almagul (Natl. U. Sci. Tech., Moscow) ; Konoplyannikov, Anatoly (Moscow, ITEP) ; Kopciewicz, Pawel (AGH-UST, Cracow) ; Kopecna, Renata (Heidelberg U.) ; Koppenburg, Patrick (NIKHEF, Amsterdam) ; Korolev, Mikhail (SINP, Moscow) ; Kostiuk, Igor (NIKHEF, Amsterdam ; Kiev, INR) ; Kot, Oleksander (Kiev, INR) ; Kotriakhova, Sofia (INFN, Ferrara ; St. Petersburg, INP) ; Kravchenko, Polina (St. Petersburg, INP) ; Kravchuk, Leonid (Moscow, INR) ; Krawczyk, Rafal Dominik (CERN) ; Kreps, Michal (Warwick U.) ; Kress, Felix Johannes (Imperial Coll., London) ; Kretzschmar, Sophie Katharina (Aachen, Tech. Hochsch.) ; Krokovny, Pavel (Novosibirsk, IYF ; Novosibirsk State U.) ; Krupa, Wojciech (AGH-UST, Cracow) ; Krzemien, Wojciech (NCBJ, Swierk) ; Kucewicz, Wojciech (Cracow, INP ; AGH-UST, Cracow) ; Kucharczyk, Marcin (Cracow, INP) ; Kudryavtsev, Vasily (Novosibirsk, IYF ; Novosibirsk State U.) ; Kuindersma, Hilbrand Steffen (NIKHEF, Amsterdam ; Vrije U., Amsterdam) ; Kunde, Gerd Joachim (Los Alamos) ; Kvaratskheliya, Tengiz (Moscow, ITEP) ; Lacarrere, Daniel (CERN) ; Lafferty, George (Manchester U.) ; Lai, Adriano (INFN, Cagliari) ; Lampis, Andrea (INFN, Cagliari) ; Lancierini, Davide (Zurich U.) ; Lane, John Jake (Manchester U.) ; Lane, Richard (Bristol U.) ; Lanfranchi, Gaia (Frascati) ; Langenbruch, Christoph (Aachen, Tech. Hochsch.) ; Langer, Jan (Tech. U., Dortmund (main)) ; Lantwin, Oliver (Zurich U.) ; Latham, Thomas (Warwick U.) ; Lazzari, Federico (INFN, Pisa ; U. Siena (main)) ; Le Gac, Renaud (Marseille, CPPM) ; Lee, Sook Hyun (U. Michigan, Ann Arbor) ; Lefèvre, Regis (Clermont-Ferrand U.) ; Leflat, Alexander (SINP, Moscow) ; Legotin, Sergey (Natl. U. Sci. Tech., Moscow) ; Leroy, Olivier (Marseille, CPPM) ; Lesiak, Tadeusz (Cracow, INP) ; Leverington, Blake (Heidelberg U.) ; Li, Hengne (South China Normal U.) ; Li, Lei (Oxford U.) ; Li, Peilian (Heidelberg U.) ; Li, Shiyang (CCNU, Wuhan, Inst. Part. Phys.) ; Li, Yiming (Beijing, Inst. High Energy Phys.) ; Li, Yutong (Beijing, Inst. High Energy Phys.) ; Li, Zhuoming (Syracuse U.) ; Liang, Xixin (Syracuse U.) ; Lin, Tai-hua (Imperial Coll., London) ; Lindner, Rolf (CERN) ; Lisovskyi, Vitalii (Tech. U., Dortmund (main)) ; Litvinov, Roman (INFN, Cagliari) ; Liu, Guoming (South China Normal U.) ; Liu, Huanhuan (Beijing, GUCAS) ; Liu, Shuaiyi (Beijing, Inst. High Energy Phys.) ; Liu, Xuesong (Tsinghua U., Beijing, CHEP) ; Loi, Angelo (INFN, Cagliari) ; Lomba Castro, Julian (U. Santiago de Compostela (main)) ; Longstaff, Iain (Glasgow U.) ; Lopes, Jose (Rio de Janeiro Federal U.) ; Lovell, George Holger (Cambridge U.) ; Lu, Yu (Beijing, Inst. High Energy Phys.) ; Lucchesi, Donatella (INFN, Padua ; U. Padua (main)) ; Luchuk, Stanislav (Moscow, INR) ; Lucio Martinez, Miriam (NIKHEF, Amsterdam) ; Lukashenko, Valeriia (NIKHEF, Amsterdam) ; Luo, Yiheng (Tsinghua U., Beijing, CHEP) ; Lupato, Anna (Manchester U.) ; Luppi, Eleonora (INFN, Ferrara ; Ferrara U.) ; Lupton, Oliver (Warwick U.) ; Lusiani, Alberto (INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Lyu, Xiao-Rui (Beijing, GUCAS) ; Ma, Lishuang (Beijing, Inst. High Energy Phys.) ; Ma, Ruiting (Beijing, GUCAS) ; Maccolini, Serena (INFN, Bologna ; Bologna U.) ; Machefert, Frederic (IJCLab, Orsay) ; Maciuc, Florin (Bucharest, IFIN-HH) ; Macko, Vladimir (Ecole Polytechnique, Lausanne) ; Mackowiak, Patrick (Tech. U., Dortmund (main)) ; Maddrell-Mander, Samuel (Bristol U.) ; Madejczyk, Olga (AGH-UST, Cracow) ; Madhan Mohan, Lakshan Ram (Bristol U.) ; Maev, Oleg (St. Petersburg, INP) ; Maevskiy, Artem (Higher Sch. of Economics, Moscow) ; Maisuzenko, Dmitrii (St. Petersburg, INP) ; Majewski, Maciej Witold (AGH-UST, Cracow) ; Malczewski, Jakub Jacek (Cracow, INP) ; Malde, Sneha (Oxford U.) ; Malecki, Bartosz (CERN) ; Malinin, Alexander (Kurchatov Inst., Moscow) ; Maltsev, Timofei (Novosibirsk, IYF ; Novosibirsk State U.) ; Malygina, Hanna (Heidelberg U.) ; Manca, Giulia (INFN, Cagliari ; Cagliari U.) ; Mancinelli, Giampiero (Marseille, CPPM) ; Manuzzi, Daniele (INFN, Bologna ; Bologna U.) ; Marangotto, Daniele (INFN, Milan ; U. Milan (main)) ; Maratas, Jan (Clermont-Ferrand U. ; Mindanao State U., Iligan) ; Marchand, Jean François (Annecy, LAPP) ; Marconi, Umberto (INFN, Bologna) ; Mariani, Saverio (INFN, Florence ; Florence U.) ; Marin Benito, Carla (CERN) ; Marinangeli, Matthieu (Ecole Polytechnique, Lausanne) ; Marks, Jörg (Heidelberg U.) ; Marshall, Alexander Mclean (Bristol U.) ; Marshall, Phillip John (Liverpool U.) ; Martellotti, Giuseppe (INFN, Rome) ; Martinazzoli, Loris (CERN ; Milan Bicocca U.) ; Martinelli, Maurizio (INFN, Milan Bicocca ; Milan Bicocca U.) ; Martinez Santos, Diego (U. Santiago de Compostela (main)) ; Martinez Vidal, Fernando (Valencia U., IFIC) ; Massafferri, André (Rio de Janeiro, CBPF) ; Materok, Marcel (Aachen, Tech. Hochsch.) ; Matev, Rosen (CERN) ; Mathad, Abhijit (Zurich U.) ; Mathe, Zoltan (CERN) ; Matiunin, Viacheslav (Moscow, ITEP) ; Matteuzzi, Clara (INFN, Milan Bicocca) ; Mattioli, Kara Renee (U. Michigan, Ann Arbor) ; Mauri, Andrea (NIKHEF, Amsterdam) ; Maurice, Emilie (Ecole Polytechnique) ; Mauricio, Juan (U. Barcelona (main)) ; Mazurek, Michal Kazimierz (CERN) ; McCann, Michael (Imperial Coll., London) ; Mcconnell, Lucas (University Coll., Dublin) ; Mcgrath, Tamaki Holly (Manchester U.) ; McNab, Andrew (Manchester U.) ; McNulty, Ronan (University Coll., Dublin) ; Mead, James Vincent (Liverpool U.) ; Meadows, Brian (Cincinnati U.) ; Meaux, Cedric (Marseille, CPPM) ; Meier, Gerwin (Tech. U., Dortmund (main)) ; Meinert, Nis (Rostock U.) ; Melnychuk, Dmytro (NCBJ, Swierk) ; Meloni, Simone (INFN, Milan Bicocca ; Milan Bicocca U.) ; Merk, Marcel (NIKHEF, Amsterdam ; Maastricht U.) ; Merli, Andrea (INFN, Milan) ; Meyer Garcia, Lucas (Rio de Janeiro Federal U.) ; Mikhasenko, Mikhail (CERN) ; Milanes, Diego Alejandro (Colombia, U. Natl.) ; Millard, Edward James (Warwick U.) ; Milovanovic, Marko (CERN) ; Minard, Marie-Noelle (Annecy, LAPP) ; Minotti, Alessandro (INFN, Ferrara) ; Minzoni, Luca (INFN, Ferrara ; Ferrara U.) ; Mitchell, Sara Elizabeth (Edinburgh U.) ; Mitreska, Biljana (Manchester U.) ; Mitzel, Dominik Stefan (CERN) ; Mödden, Antje (Tech. U., Dortmund (main)) ; Mohammed, Rizwaan Adeeb (Oxford U.) ; Moise, Razvan Daniel (Imperial Coll., London) ; Mombächer, Titus (Tech. U., Dortmund (main)) ; Monroy, Igancio Alberto (Colombia, U. Natl.) ; Monteil, Stephane (Clermont-Ferrand U.) ; Morandin, Mauro (INFN, Padua) ; Morello, Gianfranco (Frascati) ; Morello, Michael Joseph (INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Moron, Jakub (AGH-UST, Cracow) ; Morris, Adam Benjamin (Bonn U., HISKP) ; Morris, Andrew George (Warwick U.) ; Mountain, Raymond (Syracuse U.) ; Mu, Hongjie (Tsinghua U., Beijing, CHEP) ; Muheim, Franz (Edinburgh U. ; CERN) ; Mulder, Mick (CERN) ; Müller, Dominik (CERN) ; Müller, Katharina (Zurich U.) ; Murphy, Colm Harold (Oxford U.) ; Murray, Donal (Manchester U.) ; Muzzetto, Piera (INFN, Cagliari ; CERN) ; Naik, Paras (Bristol U.) ; Nakada, Tatsuya (Ecole Polytechnique, Lausanne) ; Nandakumar, Raja (Rutherford) ; Nanut, Tara (Ecole Polytechnique, Lausanne) ; Nasteva, Irina (Rio de Janeiro Federal U.) ; Needham, Matthew (Edinburgh U.) ; Neri, Ilaria (INFN, Ferrara) ; Neri, Nicola (INFN, Milan ; U. Milan (main)) ; Neubert, Sebastian (Bonn U., HISKP) ; Neufeld, Niko (CERN) ; Newcombe, Ryan (Imperial Coll., London) ; Nguyen, Thi Dung (Ecole Polytechnique, Lausanne) ; Nguyen-Mau, Chung (Ecole Polytechnique, Lausanne ; Hanoi U. of Sci.) ; Niel, Elisabeth Maria (IJCLab, Orsay) ; Nieswand, Simon (Aachen, Tech. Hochsch.) ; Nikitin, Nikolay (SINP, Moscow) ; Nolte, Niklas Stefan (Tech. U., Dortmund (main)) ; Nunez, Cynthia (U. Michigan, Ann Arbor) ; Oblakowska-Mucha, Agnieszka (AGH-UST, Cracow) ; Obraztsov, Vladimir (Serpukhov, IHEP) ; O'Hanlon, Daniel Patrick (Bristol U.) ; Oldeman, Rudolf (INFN, Cagliari ; Cagliari U.) ; Olivares, Mario Edgardo (Syracuse U.) ; Onderwater, C.J. G. (U. Groningen, VSI) ; Ossowska, Anna (Cracow, INP) ; Otalora Goicochea, Juan Martin (Rio de Janeiro Federal U.) ; Ovsiannikova, Tatiana (Moscow, ITEP) ; Owen, Patrick (Zurich U.) ; Oyanguren, Maria Aranzazu (Valencia U., IFIC) ; Pagare, Bhagyashree (Warwick U.) ; Pais, Preema Rennee (CERN) ; Pajero, Tommaso (Oxford U.) ; Palano, Antimo (INFN, Bari) ; Palutan, Matteo (Frascati) ; Pan, Yue (Manchester U.) ; Panshin, Gennady (Tomsk Polytechnic U.) ; Papanestis, Antonios (Rutherford) ; Pappagallo, Marco (INFN, Bari ; Bari U.) ; Pappalardo, Luciano (INFN, Ferrara ; Ferrara U.) ; Pappenheimer, Cheryl (Cincinnati U.) ; Parker, William (Maryland U., College Park) ; Parkes, Christopher (Manchester U.) ; Parkinson, Christopher John (U. Santiago de Compostela (main)) ; Passalacqua, Barbara (INFN, Ferrara) ; Passaleva, Giovanni (INFN, Florence) ; Pastore, Alessandra (INFN, Bari) ; Patel, Mitesh (Imperial Coll., London) ; Patrignani, Claudia (INFN, Bologna ; Bologna U.) ; Pawley, Christopher James (Maastricht U.) ; Pearce, Alex (CERN) ; Pellegrino, Antonio (NIKHEF, Amsterdam) ; Pepe Altarelli, Monica (CERN) ; Perazzini, Stefano (INFN, Bologna) ; Pereima, Dmitrii (Moscow, ITEP) ; Perret, Pascal (Clermont-Ferrand U.) ; Petric, Marko (Glasgow U. ; CERN) ; Petridis, Konstantinos (Bristol U.) ; Petrolini, Alessandro (INFN, Genoa ; Genoa U.) ; Petrov, Aleksandr (Kurchatov Inst., Moscow) ; Petrucci, Stefano (Edinburgh U.) ; Petruzzo, Marco (INFN, Milan) ; Pham, Thi Thuy Hang (Syracuse U.) ; Philippov, Anton (Yandex Sch. Data Anal., Moscow) ; Pica, Lorenzo (INFN, Pisa ; U. Pisa (main)) ; Piccini, Mauro (INFN, Perugia) ; Pietrzyk, Boleslaw (Annecy, LAPP) ; Pietrzyk, Guillaume (Ecole Polytechnique, Lausanne) ; Pili, Martina (Oxford U.) ; Pinci, Davide (INFN, Rome) ; Pisani, Flavio (CERN) ; Resmi, P.K. (Marseille, CPPM) ; Placinta, Vlad-Mihai (Bucharest, IFIN-HH) ; Plews, Jonathan (Birmingham U.) ; Plo Casasus, Maximo (U. Santiago de Compostela (main)) ; Polci, Francesco (Paris U., VI-VII) ; Poli Lener, Marco (Frascati) ; Poliakova, Mariia (Syracuse U.) ; Poluektov, Anton (Marseille, CPPM) ; Polukhina, Natalia (Natl. U. Sci. Tech., Moscow ; Lebedev Inst.) ; Polyakov, Ivan (Syracuse U.) ; Polycarpo, Erica (Rio de Janeiro Federal U.) ; Pomery, Gabriela Johanna (Bristol U.) ; Ponce, Sebastien (CERN) ; Popov, Dmitry (Beijing, GUCAS ; CERN) ; Popov, Sergei (Yandex Sch. Data Anal., Moscow) ; Poslavskii, Stanislav (Serpukhov, IHEP) ; Prasanth, Kodassery (Cracow, INP) ; Promberger, Laura (CERN) ; Prouve, Claire (U. Santiago de Compostela (main)) ; Pugatch, Valery (Kiev, INR) ; Pullen, Hannah Louise (Oxford U.) ; Punzi, Giovanni (INFN, Pisa ; U. Pisa (main)) ; Qian, Wenbin (Beijing, GUCAS) ; Qin, Jia-Jia (Beijing, GUCAS) ; Quagliani, Renato (Paris U., VI-VII) ; Quintana, Boris (Annecy, LAPP) ; Raab, Naomi Veronika (University Coll., Dublin) ; Rabadan Trejo, Raul Iraq (Marseille, CPPM) ; Rachwal, Bartlomiej (AGH-UST, Cracow) ; Rademacker, Jonas (Bristol U.) ; Rama, Matteo (INFN, Pisa) ; Ramos Pernas, Miguel (Warwick U.) ; Rangel, Murilo (Rio de Janeiro Federal U.) ; Ratnikov, Fedor (Yandex Sch. Data Anal., Moscow ; Higher Sch. of Economics, Moscow) ; Raven, Gerhard (NIKHEF, Amsterdam ; Vrije U., Amsterdam) ; Reboud, Meril (Annecy, LAPP) ; Redi, Federico (Ecole Polytechnique, Lausanne) ; Reiss, Florian (Manchester U.) ; Remon Alepuz, Clara (Valencia U., IFIC) ; Ren, Zan (Tsinghua U., Beijing, CHEP) ; Renaudin, Victor (Oxford U.) ; Ribatti, Roberto (INFN, Pisa) ; Ricciardi, Stefania (Rutherford) ; Rinnert, Kurt (Liverpool U.) ; Robbe, Patrick (IJCLab, Orsay) ; Robertson, Gary (Edinburgh U.) ; Rodrigues, Ana Barbara (Ecole Polytechnique, Lausanne) ; Rodrigues, Eduardo (Liverpool U.) ; Rodriguez Lopez, Jairo Alexis (Colombia, U. Natl.) ; Rollings, Alexandra Paige (Oxford U.) ; Roloff, Philipp (CERN) ; Romanovskiy, Vladimir (Serpukhov, IHEP) ; Romero Lamas, Marcos (U. Santiago de Compostela (main)) ; Romero Vidal, Antonio (U. Santiago de Compostela (main)) ; Roth, Jordan Daniel (U. Michigan, Ann Arbor) ; Rotondo, Marcello (Frascati) ; Rudolph, Matthew Scott (Syracuse U.) ; Ruf, Thomas (CERN) ; Ruiz Vidal, Joan (Valencia U., IFIC) ; Ryzhikov, Artem (Higher Sch. of Economics, Moscow) ; Ryzka, Jakub (AGH-UST, Cracow) ; Saborido Silva, Juan Jose (U. Santiago de Compostela (main)) ; Sagidova, Naylya (St. Petersburg, INP) ; Sahoo, Niladribihari (Warwick U.) ; Saitta, Biagio (INFN, Cagliari ; Cagliari U.) ; Salomoni, Matteo (CERN) ; Sanchez Gonzalo, David (U. Barcelona (main)) ; Sanchez Gras, Cristina (NIKHEF, Amsterdam) ; Santacesaria, Roberta (INFN, Rome) ; Santamarina Rios, Cibran (U. Santiago de Compostela (main)) ; Santimaria, Marco (Frascati) ; Santovetti, Emanuele (INFN, Rome2 ; Rome U., Tor Vergata) ; Saranin, Danila (Natl. U. Sci. Tech., Moscow) ; Sarpis, Gediminas (Glasgow U.) ; Sarpis, Minaugas (Bonn U., HISKP) ; Sarti, Alessio (INFN, Rome) ; Satriano, Celestina (INFN, Rome ; Basilicata U., Potenza) ; Satta, Alessia (INFN, Rome2) ; Saur, Miroslav (Tech. U., Dortmund (main)) ; Savrina, Darya (Moscow, ITEP ; SINP, Moscow) ; Sazak, Halime (Clermont-Ferrand U.) ; Scantlebury Smead, Luke George (Oxford U.) ; Schael, Stefan (Aachen, Tech. Hochsch.) ; Schellenberg, Margarete (Tech. U., Dortmund (main)) ; Schiller, Manuel (Glasgow U.) ; Schindler, Heinrich (CERN) ; Schmelling, Michael (Heidelberg, Max Planck Inst.) ; Schmidt, Burkhard (CERN) ; Schneider, Olivier (Ecole Polytechnique, Lausanne) ; Schopper, Andreas (CERN) ; Schubiger, Maxime (NIKHEF, Amsterdam) ; Schulte, Sebastian (Ecole Polytechnique, Lausanne) ; Schune, Marie Helene (IJCLab, Orsay) ; Schwemmer, Rainer (CERN) ; Sciascia, Barbara (Frascati) ; Sellam, Sara (U. Santiago de Compostela (main)) ; Semennikov, Alexander (Moscow, ITEP) ; Senghi Soares, Mara (NIKHEF, Amsterdam ; Vrije U., Amsterdam) ; Sergi, Antonino (INFN, Genoa) ; Serra, Nicola (Zurich U.) ; Sestini, Lorenzo (INFN, Padua) ; Seuthe, Alex (Tech. U., Dortmund (main)) ; Seyfert, Paul (CERN) ; Shang, Yiduo (Peking U., SKLNPT) ; Shangase, Desmond Mzamo (U. Michigan, Ann Arbor) ; Shapkin, Mikhail (Serpukhov, IHEP) ; Shchemerov, Ivan (Natl. U. Sci. Tech., Moscow) ; Shchutska, Lesya (Ecole Polytechnique, Lausanne) ; Shears, Tara (Liverpool U.) ; Shekhtman, Lev (Novosibirsk, IYF ; Novosibirsk State U.) ; Shen, Zhihong (Peking U., SKLNPT) ; Shevchenko, Vladimir (Kurchatov Inst., Moscow) ; Shields, Edward Brendan (INFN, Milan Bicocca ; Milan Bicocca U.) ; Shmanin, Evgenii (Natl. U. Sci. Tech., Moscow) ; Shupperd, Joseph David (Syracuse U.) ; Siddi, Benedetto Gianluca (INFN, Ferrara) ; Silva Coutinho, Rafael (Zurich U.) ; Simi, Gabriele (INFN, Padua) ; Simone, Saverio (INFN, Bari ; Bari U.) ; Skidmore, Nicola (Manchester U.) ; Skwarnicki, Tomasz (Syracuse U.) ; Slater, Mark (Birmingham U.) ; Slazyk, Igor (INFN, Ferrara ; Ferrara U.) ; Smallwood, Jennifer Clare (Oxford U.) ; Smeaton, John Gordon (Cambridge U.) ; Smetkina, Anastasia (Moscow, ITEP) ; Smith, Eluned (Aachen, Tech. Hochsch.) ; Smith, Mark (Imperial Coll., London) ; Snoch, Aleksandra (NIKHEF, Amsterdam) ; Soares, Marcelo (INFN, Bologna) ; Soares Lavra, Lais (Clermont-Ferrand U.) ; Sokoloff, Michael (Cincinnati U.) ; Soler, F.J. P. (Glasgow U.) ; Solovev, Aleksandr (St. Petersburg, INP) ; Solovyev, Ivan (St. Petersburg, INP) ; Souza De Almeida, Felipe Luan (Rio de Janeiro Federal U.) ; Souza De Paula, Bruno (Rio de Janeiro Federal U.) ; Spaan, Bernhard (Tech. U., Dortmund (main)) ; Spadaro Norella, Elisabetta (INFN, Milan ; U. Milan (main)) ; Spradlin, Patrick (Glasgow U.) ; Stagni, Federico (CERN) ; Stahl, Marian (Cincinnati U.) ; Stahl, Sascha (CERN) ; Stefko, Pavol (Ecole Polytechnique, Lausanne) ; Steinkamp, Olaf (Zurich U. ; Natl. U. Sci. Tech., Moscow) ; Stenyakin, Oleg (Serpukhov, IHEP) ; Stevens, Holger (Tech. U., Dortmund (main)) ; Stone, Sheldon (Syracuse U.) ; Stramaglia, Maria Elena (Ecole Polytechnique, Lausanne) ; Straticiuc, Mihai (Bucharest, IFIN-HH) ; Strekalina, Daria (Natl. U. Sci. Tech., Moscow) ; Suljik, Fidan (Oxford U.) ; Sun, Jiayin (INFN, Cagliari) ; Sun, Liang (Wuhan U.) ; Sun, Yipeng (Maryland U., College Park) ; Svihra, Peter (Manchester U.) ; Swallow, Paul Nathaniel (Birmingham U.) ; Swientek, Krzysztof (AGH-UST, Cracow) ; Szabelski, Adam (NCBJ, Swierk) ; Szumlak, Tomasz (AGH-UST, Cracow) ; Szymanski, Maciej Pawel (CERN) ; Taneja, Shantam (Manchester U.) ; Teubert, Frederic (CERN) ; Thomas, Eric (CERN) ; Thomson, Kayleigh Anne (Liverpool U.) ; Tisserand, Vincent (Clermont-Ferrand U.) ; T'Jampens, Stephane (Annecy, LAPP) ; Tobin, Mark (Beijing, Inst. High Energy Phys.) ; Tomassetti, Luca (INFN, Ferrara ; Ferrara U.) ; Torres Machado, Diego (Rio de Janeiro, CBPF) ; Tou, Da Yu (Paris U., VI-VII) ; Tran, Minh Tâm (Ecole Polytechnique, Lausanne) ; Trifonova, Ekaterina (Natl. U. Sci. Tech., Moscow) ; Trippl, Carina (Ecole Polytechnique, Lausanne) ; Tuci, Giulia (INFN, Pisa ; U. Pisa (main)) ; Tully, Alison (Ecole Polytechnique, Lausanne) ; Tuning, Niels (NIKHEF, Amsterdam ; CERN) ; Ukleja, Artur (NCBJ, Swierk) ; Unverzagt, Daniel Joachim (Heidelberg U.) ; Ursov, Eduard (Natl. U. Sci. Tech., Moscow) ; Usachov, Andrii (NIKHEF, Amsterdam) ; Ustyuzhanin, Andrey (Yandex Sch. Data Anal., Moscow ; Higher Sch. of Economics, Moscow) ; Uwer, Ulrich (Heidelberg U.) ; Vagner, Alexander (Tomsk Polytechnic U.) ; Vagnoni, Vincenzo (INFN, Bologna) ; Valassi, Andrea (CERN) ; Valenti, Giovanni (INFN, Bologna) ; Valls Canudas, Nuria (Ramon Llull U., Barcelona) ; van Beuzekom, Martinus (NIKHEF, Amsterdam) ; Van Dijk, Maarten (Ecole Polytechnique, Lausanne) ; van Herwijnen, Eric (Natl. U. Sci. Tech., Moscow) ; Van Hulse, Charlotte Barbara (University Coll., Dublin) ; van Veghel, Maarten (U. Groningen, VSI) ; Vazquez Gomez, Ricardo (U. Santiago de Compostela (main)) ; Vazquez Regueiro, Pablo (U. Santiago de Compostela (main)) ; Vázquez Sierra, Carlos (CERN) ; Vecchi, Stefania (INFN, Ferrara) ; Velthuis, Jaap (Bristol U.) ; Veltri, Michele (INFN, Florence ; U. Urbino (main)) ; Venkateswaran, Aravindhan (Syracuse U.) ; Veronesi, Michele (NIKHEF, Amsterdam) ; Vesterinen, Mika (Warwick U.) ; Vieira, Daniel (Cincinnati U.) ; Vieites Diaz, Maria (Ecole Polytechnique, Lausanne) ; Viemann, Harald (Rostock U.) ; Vilasis-Cardona, Xavier (Ramon Llull U., Barcelona) ; Vilella Figueras, Eva (Liverpool U.) ; Vincent, Pascal (Paris U., VI-VII) ; Vom Bruch, Dorothea (Marseille, CPPM) ; Vorobyev, Alexey (St. Petersburg, INP) ; Vorobyev, Vitaly (Novosibirsk, IYF ; Novosibirsk State U.) ; Voropaev, Nikolai (St. Petersburg, INP) ; Waldi, Roland (Rostock U.) ; Walsh, John (INFN, Pisa) ; Wang, Chishuai (Heidelberg U.) ; Wang, Jialu (Peking U., SKLNPT) ; Wang, Jianchun (Beijing, Inst. High Energy Phys.) ; Wang, Jianqiao (Tsinghua U., Beijing, CHEP) ; Wang, Jike (Wuhan U.) ; Wang, Mengzhen (Tsinghua U., Beijing, CHEP) ; Wang, Rui (Bristol U.) ; Wang, Yilong (CCNU, Wuhan, Inst. Part. Phys.) ; Wang, Zhenzi (Zurich U.) ; Wang, Zirui (Tsinghua U., Beijing, CHEP) ; Wark, Heather Mckenzie (Liverpool U.) ; Watson, Nigel (Birmingham U.) ; Weber, Steffen Georg (Paris U., VI-VII) ; Websdale, David (Imperial Coll., London) ; Weisser, Constantin (MIT) ; Westhenry, Benedict Donald C. (Bristol U.) ; White, Dylan Jaide (Manchester U.) ; Whitehead, Mark (Bristol U.) ; Wiedner, Dirk (Tech. U., Dortmund (main)) ; Wilkinson, Guy (Oxford U.) ; Wilkinson, Michael (Syracuse U.) ; Williams, Ifan (Cambridge U.) ; Williams, Mike (MIT) ; Williams, Mark Richard James (Edinburgh U.) ; Wilson, Fergus (Rutherford) ; Wislicki, Wojciech (NCBJ, Swierk) ; Witek, Mariusz (Cracow, INP) ; Witola, Lukas (Heidelberg U.) ; Wormser, Guy (IJCLab, Orsay) ; Wotton, Stephen (Cambridge U.) ; Wu, Hangyi (Syracuse U.) ; Wyllie, Kenneth (CERN) ; Xiang, Zhiyu (Beijing, GUCAS) ; Xiao, Dong (CCNU, Wuhan, Inst. Part. Phys.) ; Xie, Yuehong (CCNU, Wuhan, Inst. Part. Phys.) ; Xu, Ao (Peking U., SKLNPT) ; Xu, Jingyi (Beijing, GUCAS) ; Xu, Li (Tsinghua U., Beijing, CHEP) ; Xu, Menglin (CCNU, Wuhan, Inst. Part. Phys.) ; Xu, Qingnian (Beijing, GUCAS) ; Xu, Zehua (Peking U., SKLNPT) ; Xu, Zhihao (Beijing, GUCAS) ; Yang, Di (Tsinghua U., Beijing, CHEP) ; Yang, Shuangli (Beijing, GUCAS) ; Yang, Youhua (Beijing, GUCAS) ; Yang, Zhenwei (Tsinghua U., Beijing, CHEP) ; Yang, Zishuo (Maryland U., College Park) ; Yao, Yuezhe (Syracuse U.) ; Yeomans, Lauren Emma (Liverpool U.) ; Yin, Hang (CCNU, Wuhan, Inst. Part. Phys.) ; Yu, Jiesheng (Hunan U.) ; Yuan, Xuhao (Syracuse U.) ; Yushchenko, Oleg (Serpukhov, IHEP) ; Zaffaroni, Ettore (Ecole Polytechnique, Lausanne) ; Zavertyaev, Mikhail (Heidelberg, Max Planck Inst. ; Lebedev Inst.) ; Zdybal, Milosz (Cracow, INP) ; Zenaiev, Oleksandr (CERN) ; Zeng, Ming (Tsinghua U., Beijing, CHEP) ; Zhang, Dongliang (CCNU, Wuhan, Inst. Part. Phys.) ; Zhang, Liming (Tsinghua U., Beijing, CHEP) ; Zhang, Shunan (Peking U., SKLNPT) ; Zhang, Yanxi (Peking U., SKLNPT) ; Zhang, Yu (Oxford U.) ; Zhelezov, Alexey (Heidelberg U.) ; Zheng, Yangheng (Beijing, GUCAS) ; Zhou, Xiaokang (Beijing, GUCAS) ; Zhou, Yixiong (Beijing, GUCAS) ; Zhu, Xianglei (Tsinghua U., Beijing, CHEP) ; Zhu, Zhanwen (Beijing, GUCAS) ; Zhukov, Valery (Aachen, Tech. Hochsch. ; SINP, Moscow) ; Zonneveld, Jennifer Brigitta (Edinburgh U.) ; Zou, Quan (Beijing, Inst. High Energy Phys.) ; Zucchelli, Stefano (INFN, Bologna ; Bologna U.) ; Zuliani, Davide (INFN, Padua) ; Zunica, Gianluca (Manchester U.)

Corporate Author(s) LHCb Collaboration
Publication 2022-03-15
Imprint 22 Mar 2021
Number of pages 25
Note All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-004.html (LHCb public pages)
In: Nature Phys. 18, 3 (2022) pp.277-282
DOI 10.1038/s41567-021-01478-8
10.1038/s41567-023-02095-3 (addendum)
Subject category Particle Physics - Experiment ; hep-ex
Accelerator/Facility, Experiment CERN LHC ; LHCb
Free keywords flavor physics ; rare decay ; conservation law tests
Abstract The Standard Model of particle physics currently provides our best description of fundamental particles and their interactions. The theory predicts that the different charged leptons, the electron, muon and tau, have identical electroweak interaction strengths. Previous measurements have shown a wide range of particle decays are consistent with this principle of lepton universality. This article presents evidence for the breaking of lepton universality in beauty-quark decays, with a significance of 3.1 standard deviations, based on proton-proton collision data collected with the LHCb detector at CERN's Large Hadron Collider. The measurements are of processes in which a beauty meson transforms into a strange meson with the emission of either an electron and a positron, or a muon and an antimuon. If confirmed by future measurements, this violation of lepton universality would imply physics beyond the Standard Model, such as a new fundamental interaction between quarks and leptons.
Copyright/License preprint: © 2021 CERN for the benefit of the LHCb collaboration
publication: © 2021 CERN for the benefit of the LHCb collaboration (License: CC-BY-4.0)



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Email contact: lhcb.secretariat@cern.ch


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