Letter
Open Access

Search for $K_{S (L)}^{0} \to μ^{+} μ^{-} μ^{+} μ^{-}$ decays at LHCb

R. Aaij ³², A. S. W. Abdelmotteleb ⁵⁰, C. Abellan Beteta⁴⁴, F. Abudinén ⁵⁰, T. Ackernley ⁵⁴, B. Adeva ⁴⁰, M. Adinolfi ⁴⁸, P. Adlarson ⁷⁷, H. Afsharnia⁹ et al. (LHCb Collaboration)

H. Afsharnia⁹, C. Agapopoulou ¹³, C. A. Aidala ⁷⁸, Z. Ajaltouni⁹, S. Akar ⁵⁹, K. Akiba ³², P. Albicocco ²³, J. Albrecht ¹⁵, F. Alessio ⁴², M. Alexander ⁵³, A. Alfonso Albero ³⁹, Z. Aliouche ⁵⁶, P. Alvarez Cartelle ⁴⁹, R. Amalric ¹³, S. Amato ², J. L. Amey ⁴⁸, Y. Amhis ^11,42, L. An ⁴², L. Anderlini ²², M. Andersson ⁴⁴, A. Andreianov ³⁸, M. Andreotti ²¹, D. Andreou ⁶², D. Ao ⁶, F. Archilli ¹⁷, A. Artamonov ³⁸, M. Artuso ⁶², E. Aslanides ¹⁰, M. Atzeni ⁴⁴, B. Audurier ¹², I. B Bachiller Perea ⁸, S. Bachmann ¹⁷, M. Bachmayer ⁴³, J. J. Back ⁵⁰, A. Bailly-reyre¹³, P. Baladron Rodriguez ⁴⁰, V. Balagura ¹², W. Baldini ^21,42, J. Baptista de Souza Leite ¹, M. Barbetti ^22,b, R. J. Barlow ⁵⁶, S. Barsuk ¹¹, W. Barter ⁵², M. Bartolini ⁴⁹, F. Baryshnikov ³⁸, J. M. Basels ¹⁴, G. Bassi ^29,c, B. Batsukh ⁴, A. Battig ¹⁵, A. Bay ⁴³, A. Beck ⁵⁰, M. Becker ¹⁵, F. Bedeschi ²⁹, I. B. Bediaga ¹, A. Beiter⁶², V. Belavin³⁸, S. Belin ⁴⁰, V. Bellee ⁴⁴, K. Belous ³⁸, I. Belov ³⁸, I. Belyaev ³⁸, G. Benane ¹⁰, G. Bencivenni ²³, E. Ben-Haim ¹³, A. Berezhnoy ³⁸, R. Bernet ⁴⁴, S. Bernet Andres ⁷⁶, D. Berninghoff¹⁷, H. C. Bernstein⁶², C. Bertella ⁵⁶, A. Bertolin ²⁸, C. Betancourt ⁴⁴, F. Betti ⁴², Ia. Bezshyiko ⁴⁴, S. Bhasin ⁴⁸, J. Bhom ³⁵, L. Bian ⁶⁸, M. S. Bieker ¹⁵, N. V. Biesuz ²¹, P. Billoir ¹³, A. Biolchini ³², M. Birch ⁵⁵, F. C. R. Bishop ⁴⁹, A. Bitadze ⁵⁶, A. Bizzeti , M. P. Blago ⁴⁹, T. Blake ⁵⁰, F. Blanc ⁴³, J. E. Blank ¹⁵, S. Blusk ⁶², D. Bobulska ⁵³, J. A. Boelhauve ¹⁵, O. Boente Garcia ¹², T. Boettcher ⁵⁹, A. Boldyrev ³⁸, C. S. Bolognani ⁷⁴, R. Bolzonella ^21,d, N. Bondar ^38,42, F. Borgato ²⁸, S. Borghi ⁵⁶, M. Borsato ¹⁷, J. T. Borsuk ³⁵, S. A. Bouchiba ⁴³, T. J. V. Bowcock ⁵⁴, A. Boyer ⁴², C. Bozzi ²¹, M. J. Bradley⁵⁵, S. Braun ⁶⁰, A. Brea Rodriguez ⁴⁰, J. Brodzicka ³⁵, A. Brossa Gonzalo ⁴⁰, J. Brown ⁵⁴, D. Brundu ²⁷, A. Buonaura ⁴⁴, L. Buonincontri ²⁸, A. T. Burke ⁵⁶, C. Burr ⁴², A. Bursche⁶⁶, A. Butkevich ³⁸, J. S. Butter ³², J. Buytaert ⁴², W. Byczynski ⁴², S. Cadeddu ²⁷, H. Cai⁶⁸, R. Calabrese ^21,d, L. Calefice ¹⁵, S. Cali ²³, M. Calvi ^26,e, M. Calvo Gomez ⁷⁶, P. Campana ²³, D. H. Campora Perez ⁷⁴, A. F. Campoverde Quezada ⁶, S. Capelli ^26,e, L. Capriotti ²⁰, A. Carbone ^20,f, R. Cardinale ^24,g, A. Cardini ²⁷, P. Carniti ^26,e, L. Carus¹⁴, A. Casais Vidal ⁴⁰, R. Caspary ¹⁷, G. Casse ⁵⁴, M. Cattaneo ⁴², G. Cavallero ^55,42, V. Cavallini ^21,d, S. Celani ⁴³, J. Cerasoli ¹⁰, D. Cervenkov ⁵⁷, A. J. Chadwick ⁵⁴, I. Chahrour ⁷⁸, M. G. Chapman⁴⁸, M. Charles ¹³, Ph. Charpentier ⁴², C. A. Chavez Barajas ⁵⁴, M. Chefdeville ⁸, C. Chen ³, S. Chen ⁴, A. Chernov ³⁵, S. Chernyshenko ⁴⁶, V. Chobanova ⁴⁰, S. Cholak ⁴³, M. Chrzaszcz ³⁵, A. Chubykin ³⁸, V. Chulikov ³⁸, P. Ciambrone ²³, M. F. Cicala ⁵⁰, X. Cid Vidal ⁴⁰, G. Ciezarek ⁴², P. Cifra ⁴², G. Ciullo ^21,d, P. E. L. Clarke ⁵², M. Clemencic ⁴², H. V. Cliff ⁴⁹, J. Closier ⁴², J. L. Cobbledick ⁵⁶, V. Coco ⁴², J. A. B. Coelho ¹¹, J. Cogan ¹⁰, E. Cogneras ⁹, L. Cojocariu ³⁷, P. Collins ⁴², T. Colombo ⁴², L. Congedo ¹⁹, A. Contu ²⁷, N. Cooke ⁴⁷, I. Corredoira ⁴⁰, G. Corti ⁴², B. Couturier ⁴², D. C. Craik ⁴⁴, M. Cruz Torres ^1,h, R. Currie ⁵², C. L. Da Silva ⁶¹, S. Dadabaev ³⁸, L. Dai ⁶⁵, X. Dai ⁵, E. Dall’Occo ¹⁵, J. Dalseno ⁴⁰, C. D’Ambrosio ⁴², J. Daniel ⁹, A. Danilina ³⁸, P. d’Argent ¹⁹, J. E. Davies ⁵⁶, A. Davis ⁵⁶, O. De Aguiar Francisco ⁵⁶, J. de Boer ⁴², K. De Bruyn ⁷³, S. De Capua ⁵⁶, M. De Cian ⁴³, U. De Freitas Carneiro Da Graca ¹, E. De Lucia ²³, J. M. De Miranda ¹, L. De Paula ², M. De Serio ^19,i, D. De Simone ⁴⁴, P. De Simone ²³, F. De Vellis ¹⁵, J. A. de Vries ⁷⁴, C. T. Dean ⁶¹, F. Debernardis ^19,i, D. Decamp ⁸, V. Dedu ¹⁰, L. Del Buono ¹³, B. Delaney ⁵⁸, H.-P. Dembinski ¹⁵, V. Denysenko ⁴⁴, O. Deschamps ⁹, F. Dettori ^27,j, B. Dey ⁷¹, P. Di Nezza ²³, I. Diachkov ³⁸, S. Didenko ³⁸, L. Dieste Maronas⁴⁰, S. Ding ⁶², V. Dobishuk ⁴⁶, A. Dolmatov³⁸, C. Dong ³, A. M. Donohoe ¹⁸, F. Dordei ²⁷, A. C. dos Reis ¹, L. Douglas⁵³, A. G. Downes ⁸, P. Duda ⁷⁵, M. W. Dudek ³⁵, L. Dufour ⁴², V. Duk ⁷², P. Durante ⁴², M. M. Duras ⁷⁵, J. M. Durham ⁶¹, D. Dutta ⁵⁶, A. Dziurda ³⁵, A. Dzyuba ³⁸, S. Easo ⁵¹, U. Egede ⁶³, V. Egorychev ³⁸, C. Eirea Orro⁴⁰, S. Eisenhardt ⁵², E. Ejopu ⁵⁶, S. Ek-In ⁴³, L. Eklund ⁷⁷, J. Ellbracht ¹⁵, S. Ely ⁵⁵, A. Ene ³⁷, E. Epple ⁵⁹, S. Escher ¹⁴, J. Eschle ⁴⁴, S. Esen ⁴⁴, T. Evans ⁵⁶, F. Fabiano ^27,j, L. N. Falcao ¹, Y. Fan ⁶, B. Fang ^11,68, L. Fantini ^72,k, M. Faria ⁴³, S. Farry ⁵⁴, D. Fazzini ^26,e, L. F Felkowski ⁷⁵, M. Feo ⁴², M. Fernandez Gomez ⁴⁰, A. D. Fernez ⁶⁰, F. Ferrari ²⁰, L. Ferreira Lopes ⁴³, F. Ferreira Rodrigues ², S. Ferreres Sole ³², M. Ferrillo ⁴⁴, M. Ferro-Luzzi ⁴², S. Filippov ³⁸, R. A. Fini ¹⁹, M. Fiorini ^21,d, M. Firlej ³⁴, K. M. Fischer ⁵⁷, D. S. Fitzgerald ⁷⁸, C. Fitzpatrick ⁵⁶, T. Fiutowski ³⁴, F. Fleuret ¹², M. Fontana ¹³, F. Fontanelli ^24,g, R. Forty ⁴², D. Foulds-Holt ⁴⁹, V. Franco Lima ⁵⁴, M. Franco Sevilla ⁶⁰, M. Frank ⁴², E. Franzoso ^21,d, G. Frau ¹⁷, C. Frei ⁴², D. A. Friday ⁵³, J. Fu ⁶, Q. Fuehring ¹⁵, T. Fulghesu ¹³, E. Gabriel ³², G. Galati ^19,i, M. D. Galati ³², A. Gallas Torreira ⁴⁰, D. Galli ^20,f, S. Gambetta ^52,42, Y. Gan ³, M. Gandelman ², P. Gandini ²⁵, Y. Gao ⁷, Y. Gao ⁵, M. Garau ^27,j, L. M. Garcia Martin ⁵⁰, P. Garcia Moreno ³⁹, J. García Pardiñas ^26,e, B. Garcia Plana⁴⁰, F. A. Garcia Rosales ¹², L. Garrido ³⁹, C. Gaspar ⁴², R. E. Geertsema ³², D. Gerick¹⁷, L. L. Gerken ¹⁵, E. Gersabeck ⁵⁶, M. Gersabeck ⁵⁶, T. Gershon ⁵⁰, L. Giambastiani ²⁸, V. Gibson ⁴⁹, H. K. Giemza ³⁶, A. L. Gilman ⁵⁷, M. Giovannetti ^23,l, A. Gioventù ⁴⁰, P. Gironella Gironell ³⁹, C. Giugliano ^21,d, M. A. Giza ³⁵, K. Gizdov ⁵², E. L. Gkougkousis ⁴², V. V. Gligorov ^13,42, C. Göbel ⁶⁴, E. Golobardes ⁷⁶, D. Golubkov ³⁸, A. Golutvin ^55,38, A. Gomes ^1,m, S. Gomez Fernandez ³⁹, F. Goncalves Abrantes ⁵⁷, M. Goncerz ³⁵, G. Gong ³, I. V. Gorelov ³⁸, C. Gotti ²⁶, J. P. Grabowski ⁷⁰, T. Grammatico ¹³, L. A. Granado Cardoso ⁴², E. Graugés ³⁹, E. Graverini ⁴³, G. Graziani , A. T. Grecu ³⁷, L. M. Greeven ³², N. A. Grieser ⁵⁹, L. Grillo ⁵³, S. Gromov ³⁸, B. R. Gruberg Cazon ⁵⁷, C. Gu ³, M. Guarise ^21,d, M. Guittiere ¹¹, P. A. Günther ¹⁷, E. Gushchin ³⁸, A. Guth¹⁴, Y. Guz ³⁸, T. Gys ⁴², T. Hadavizadeh ⁶³, C. Hadjivasiliou ⁶⁰, G. Haefeli ⁴³, C. Haen ⁴², J. Haimberger ⁴², S. C. Haines ⁴⁹, T. Halewood-leagas ⁵⁴, M. M. Halvorsen ⁴², P. M. Hamilton ⁶⁰, J. Hammerich ⁵⁴, Q. Han ⁷, X. Han ¹⁷, E. B. Hansen ⁵⁶, S. Hansmann-Menzemer ¹⁷, L. Hao ⁶, N. Harnew ⁵⁷, T. Harrison ⁵⁴, C. Hasse ⁴², M. Hatch ⁴², J. He ^6,n, K. Heijhoff ³², F. H Hemmer ⁴², C. Henderson ⁵⁹, R. D. L. Henderson ^63,50, A. M. Hennequin ⁵⁸, K. Hennessy ⁵⁴, L. Henry ⁴², J. Herd ⁵⁵, J. Heuel ¹⁴, A. Hicheur ², D. Hill ⁴³, M. Hilton ⁵⁶, S. E. Hollitt ¹⁵, J. Horswill ⁵⁶, R. Hou ⁷, Y. Hou ⁸, J. Hu¹⁷, J. Hu ⁶⁶, W. Hu ⁵, X. Hu ³, W. Huang ⁶, X. Huang⁶⁸, W. Hulsbergen ³², R. J. Hunter ⁵⁰, M. Hushchyn ³⁸, D. Hutchcroft ⁵⁴, P. Ibis ¹⁵, M. Idzik ³⁴, D. Ilin ³⁸, P. Ilten ⁵⁹, A. Inglessi ³⁸, A. Iniukhin ³⁸, A. Ishteev ³⁸, K. Ivshin ³⁸, R. Jacobsson ⁴², H. Jage ¹⁴, S. J. Jaimes Elles ⁴¹, S. Jakobsen ⁴², E. Jans ³², B. K. Jashal ⁴¹, A. Jawahery ⁶⁰, V. Jevtic ¹⁵, E. Jiang ⁶⁰, X. Jiang ^4,6, Y. Jiang ⁶, M. John ⁵⁷, D. Johnson ⁵⁸, C. R. Jones ⁴⁹, T. P. Jones ⁵⁰, B. Jost ⁴², N. Jurik ⁴², I. Juszczak ³⁵, S. Kandybei ⁴⁵, Y. Kang ³, M. Karacson ⁴², D. Karpenkov ³⁸, M. Karpov ³⁸, J. W. Kautz ⁵⁹, F. Keizer ⁴², D. M. Keller ⁶², M. Kenzie ⁵⁰, T. Ketel ³², B. Khanji ¹⁵, A. Kharisova ³⁸, S. Kholodenko ³⁸, G. Khreich ¹¹, T. Kirn ¹⁴, V. S. Kirsebom ⁴³, O. Kitouni ⁵⁸, S. Klaver ³³, N. Kleijne ^29,c, K. Klimaszewski ³⁶, M. R. Kmiec ³⁶, S. Koliiev ⁴⁶, L. Kolk ¹⁵, A. Kondybayeva ³⁸, A. Konoplyannikov ³⁸, P. Kopciewicz ³⁴, R. Kopecna¹⁷, P. Koppenburg ³², M. Korolev ³⁸, I. Kostiuk ^32,46, O. Kot⁴⁶, S. Kotriakhova , A. Kozachuk ³⁸, P. Kravchenko ³⁸, L. Kravchuk ³⁸, R. D. Krawczyk ⁴², M. Kreps ⁵⁰, S. Kretzschmar ¹⁴, P. Krokovny ³⁸, W. Krupa ³⁴, W. Krzemien ³⁶, J. Kubat¹⁷, S. Kubis ⁷⁵, W. Kucewicz ³⁵, M. Kucharczyk ³⁵, V. 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Maccolini ¹⁵, F. Machefert ¹¹, F. Maciuc ³⁷, I. Mackay ⁵⁷, V. Macko ⁴³, L. R. Madhan Mohan ⁴⁸, A. Maevskiy ³⁸, D. Maisuzenko ³⁸, M. W. Majewski³⁴, J. J. Malczewski ³⁵, S. Malde ⁵⁷, B. Malecki ^35,42, A. Malinin ³⁸, T. Maltsev ³⁸, G. Manca ^27,j, G. Mancinelli ¹⁰, C. Mancuso ^11,25,p, R. Manera Escalero³⁹, D. Manuzzi ²⁰, C. A. Manzari ⁴⁴, D. Marangotto ^25,p, J. F. Marchand ⁸, U. Marconi ²⁰, S. Mariani ^22,b, C. Marin Benito ^39,42, J. Marks ¹⁷, A. M. Marshall ⁴⁸, P. J. Marshall⁵⁴, G. Martelli ^72,k, G. Martellotti ³⁰, L. Martinazzoli ^42,e, M. Martinelli ^26,e, D. Martinez Santos ⁴⁰, F. Martinez Vidal ⁴¹, A. Massafferri ¹, M. Materok ¹⁴, R. Matev ⁴², A. Mathad ⁴⁴, V. Matiunin ³⁸, C. Matteuzzi ²⁶, K. R. Mattioli ¹², A. Mauri ³², E. Maurice ¹², J. Mauricio ³⁹, M. Mazurek ⁴², M. McCann ⁵⁵, L. Mcconnell ¹⁸, T. H. McGrath ⁵⁶, N. T. McHugh ⁵³, A. McNab ⁵⁶, R. McNulty ¹⁸, J. V. Mead ⁵⁴, B. Meadows ⁵⁹, G. Meier ¹⁵, D. Melnychuk ³⁶, S. Meloni ^26,e, M. Merk ^32,74, A. Merli ^25,p, L. Meyer Garcia ², D. Miao ^4,6, M. Mikhasenko ^70,s, D. A. Milanes ⁶⁹, E. Millard⁵⁰, M. Milovanovic ⁴², M.-N. Minard^8,a, A. Minotti ^26,e, T. Miralles ⁹, S. E. Mitchell ⁵², B. Mitreska ¹⁵, D. S. Mitzel ¹⁵, A. Mödden ¹⁵, R. A. Mohammed ⁵⁷, R. D. Moise ¹⁴, S. Mokhnenko ³⁸, T. Mombächer ⁴⁰, M. Monk ^50,63, I. A. Monroy ⁶⁹, S. Monteil ⁹, A. Morcillo Gomez ⁴⁰, G. Morello ²³, M. J. Morello ^29,c, J. Moron ³⁴, A. B. Morris ⁴², A. G. Morris ⁵⁰, R. Mountain ⁶², H. Mu ³, E. Muhammad ⁵⁰, F. Muheim ⁵², M. Mulder ⁷³, K. Müller ⁴⁴, C. H. Murphy ⁵⁷, D. Murray ⁵⁶, R. Murta ⁵⁵, P. Muzzetto ^27,j, P. Naik ⁴⁸, T. Nakada ⁴³, R. Nandakumar ⁵¹, T. Nanut ⁴², I. Nasteva ², M. Needham ⁵², N. Neri ^25,p, S. Neubert ⁷⁰, N. Neufeld ⁴², P. Neustroev³⁸, R. Newcombe⁵⁵, J. Nicolini ^15,11, D. Nicotra ⁷⁴, E. M. Niel ⁴³, S. Nieswand¹⁴, N. Nikitin ³⁸, N. S. Nolte ⁵⁸, C. Normand ^8,27,j, J. Novoa Fernandez ⁴⁰, G. N Nowak ⁵⁹, C. Nunez ⁷⁸, A. Oblakowska-Mucha ³⁴, V. Obraztsov ³⁸, T. Oeser ¹⁴, D. P. O’Hanlon ⁴⁸, S. 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Zunica ⁵⁶ (LHCb Collaboration)

¹Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
²Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
³Center for High Energy Physics, Tsinghua University, Beijing, China
⁴Institute of High Energy Physics (IHEP), Beijing, China
⁵School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
⁶University of Chinese Academy of Sciences, Beijing, China
⁷Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
⁸Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France
⁹Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
¹⁰Aix Marseille Université, CNRS/IN2P3, CPPM, Marseille, France
¹¹Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
¹²Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
¹³LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
¹⁴I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
¹⁵Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
¹⁶Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
¹⁷Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
¹⁸School of Physics, University College Dublin, Dublin, Ireland
¹⁹INFN Sezione di Bari, Bari, Italy
²⁰INFN Sezione di Bologna, Bologna, Italy
²¹INFN Sezione di Ferrara, Ferrara, Italy
²²INFN Sezione di Firenze, Firenze, Italy
²³INFN Laboratori Nazionali di Frascati, Frascati, Italy
²⁴INFN Sezione di Genova, Genova, Italy
²⁵INFN Sezione di Milano, Milano, Italy
²⁶INFN Sezione di Milano-Bicocca, Milano, Italy
²⁷INFN Sezione di Cagliari, Monserrato, Italy
²⁸Università degli Studi di Padova, Università e INFN, Padova, Italy
²⁹INFN Sezione di Pisa, Pisa, Italy
³⁰INFN Sezione di Roma La Sapienza, Roma, Italy
³¹INFN Sezione di Roma Tor Vergata, Roma, Italy
³²Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands
³³Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands
³⁴AGH—University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland
³⁵Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
³⁶National Center for Nuclear Research (NCBJ), Warsaw, Poland
³⁷Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
³⁸Affiliated with an institute covered by a cooperation agreement with CERN
³⁹ICCUB, Universitat de Barcelona, Barcelona, Spain
⁴⁰Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
⁴¹Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia—CSIC, Valencia, Spain
⁴²European Organization for Nuclear Research (CERN), Geneva, Switzerland
⁴³Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
⁴⁴Physik-Institut, Universität Zürich, Zürich, Switzerland
⁴⁵NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
⁴⁶Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
⁴⁷University of Birmingham, Birmingham, United Kingdom
⁴⁸H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
⁴⁹Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
⁵⁰Department of Physics, University of Warwick, Coventry, United Kingdom
⁵¹STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
⁵²School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
⁵³School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
⁵⁴Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
⁵⁵Imperial College London, London, United Kingdom
⁵⁶Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
⁵⁷Department of Physics, University of Oxford, Oxford, United Kingdom
⁵⁸Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
⁵⁹University of Cincinnati, Cincinnati, Ohio, USA
⁶⁰University of Maryland, College Park, Maryland, USA
⁶¹Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA
⁶²Syracuse University, Syracuse, New York, USA
⁶³School of Physics and Astronomy, Monash University, Melbourne, Australia (associated with Department of Physics, University of Warwick, Coventry, United Kingdom)
⁶⁴Pontifícia 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)
⁶⁵Physics and Micro Electronic College, Hunan University, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
⁶⁶Guangdong 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 Center for High Energy Physics, Tsinghua University, Beijing, China)
⁶⁷Lanzhou University, Lanzhou, China (associated with Institute of High Energy Physics (IHEP), Beijing, China)
⁶⁸School of Physics and Technology, Wuhan University, Wuhan, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China)
⁶⁹Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France)
⁷⁰Universität Bonn—Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany)
⁷¹Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland)
⁷²INFN Sezione di Perugia, Perugia, Italy (associated with INFN Sezione di Ferrara, Ferrara, Italy)
⁷³Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁷⁴Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁷⁵Tadeusz Kosciuszko Cracow University of Technology, Cracow, Poland (associated with Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland)
⁷⁶DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain (associated with ICCUB, Universitat de Barcelona, Barcelona, Spain)
⁷⁷Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom)
⁷⁸University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA)

^*Full author list given at the end of the article.
^aDeceased.
^bAlso at Università di Firenze, Firenze, Italy.
^cAlso at Scuola Normale Superiore, Pisa, Italy.
^dAlso at Università di Ferrara, Ferrara, Italy.
^eAlso at Università di Milano Bicocca, Milano, Italy.
^fAlso at Università di Bologna, Bologna, Italy.
^gAlso at Università di Genova, Genova, Italy.
^hAlso at Universidad Nacional Autónoma de Honduras, Tegucigalpa, Honduras.
ⁱAlso at Università di Bari, Bari, Italy.
^jAlso at Università di Cagliari, Cagliari, Italy.
^kAlso at Università di Perugia, Perugia, Italy.
^lAlso at Università di Roma Tor Vergata, Roma, Italy.
^mAlso at Universidade de Brasília, Brasília, Brazil.
ⁿAlso at Hangzhou Institute for Advanced Study, UCAS, Hangzhou, China.
^oAlso at Università di Pisa, Pisa, Italy.
^pAlso at Università degli Studi di Milano, Milano, Italy.
^qAlso at Central South University, Changsha, China.
^rAlso at Università di Padova, Padova, Italy.
^sAlso at Excellence Cluster ORIGINS, Munich, Germany.
^tAlso at Università della Basilicata, Potenza, Italy.
^uAlso at Universidad de Alcalá, Alcalá de Henares, Spain.
^vAlso at Università di Urbino, Urbino, Italy.

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Phys. Rev. D 108, L031102 – Published 3 August, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L031102

Abstract

A search for $K_{S (L)}^{0} \to μ^{+} μ^{-} μ^{+} μ^{-}$ decays is performed using proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of $5.1 {fb}^{- 1}$ . No evidence for signal is found. The 90% confidence level upper limits are the first set for both decays and are $B (K_{S}^{0} \to μ^{+} μ^{-} μ^{+} μ^{-}) < 5.1 \times 10^{- 12}$ and $B (K_{L}^{0} \to μ^{+} μ^{-} μ^{+} μ^{-}) < 2.3 \times 10^{- 9}$ .

Physics Subject Headings (PhySH)

Article Text

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Phys. Rev. D 108, L031102– Published 3 August, 2023

Vol. 108, Iss. 3 — 1 August 2023

Received 22 December 2022
Accepted 23 January 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L031102

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Physical Review D

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Search for $K_{S (L)}^{0} \to μ^{+} μ^{-} μ^{+} μ^{-}$ decays at LHCb

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Search for KS(L)0→μ+μ−μ+μ− decays at LHCb

Abstract

Physics Subject Headings (PhySH)

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References (40)

Search for $K_{S (L)}^{0} \to μ^{+} μ^{-} μ^{+} μ^{-}$ decays at LHCb