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Phys Rev Lett. 2018 Oct 05;121(14):141801. doi: 10.1103/PhysRevLett.121.141801.

Observation of the Z→ψℓ^{+}ℓ^{-} Decay in pp Collisions at sqrt[s]=13  TeV.

Physical review letters

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Shi, D Stolp, D Taylor, K Tos, M Tripathi, Z Wang, F Zhang, M Bachtis, C Bravo, R Cousins, A Dasgupta, A Florent, J Hauser, M Ignatenko, N Mccoll, S Regnard, D Saltzberg, C Schnaible, V Valuev, E Bouvier, K Burt, R Clare, J W Gary, S M A Ghiasi Shirazi, G Hanson, G Karapostoli, E Kennedy, F Lacroix, O R Long, M Olmedo Negrete, M I Paneva, W Si, L Wang, H Wei, S Wimpenny, B R Yates, J G Branson, S Cittolin, M Derdzinski, R Gerosa, D Gilbert, B Hashemi, A Holzner, D Klein, G Kole, V Krutelyov, J Letts, M Masciovecchio, D Olivito, S Padhi, M Pieri, M Sani, V Sharma, S Simon, M Tadel, A Vartak, S Wasserbaech, J Wood, F Würthwein, A Yagil, G Zevi Della Porta, N Amin, R Bhandari, J Bradmiller-Feld, C Campagnari, M Citron, A Dishaw, V Dutta, M Franco Sevilla, L Gouskos, R Heller, J Incandela, A Ovcharova, H Qu, J Richman, D Stuart, I Suarez, S Wang, J Yoo, D Anderson, A Bornheim, J M Lawhorn, H B Newman, T Q Nguyen, M Spiropulu, J R Vlimant, R Wilkinson, S Xie, Z Zhang, R Y Zhu, M B Andrews, T Ferguson, T Mudholkar, M Paulini, M Sun, I Vorobiev, M Weinberg, J P Cumalat, W T Ford, F Jensen, A Johnson, M Krohn, S Leontsinis, E MacDonald, T Mulholland, K Stenson, K A Ulmer, S R Wagner, J Alexander, J Chaves, Y Cheng, J Chu, A Datta, K Mcdermott, N Mirman, J R Patterson, D Quach, A Rinkevicius, A Ryd, L Skinnari, L Soffi, S M Tan, Z Tao, J Thom, J Tucker, P Wittich, M Zientek, S Abdullin, M Albrow, M Alyari, G Apollinari, A Apresyan, A Apyan, S Banerjee, L A T Bauerdick, A Beretvas, J Berryhill, P C Bhat, G Bolla, K Burkett, J N Butler, A Canepa, G B Cerati, H W K Cheung, F Chlebana, M Cremonesi, J Duarte, V D Elvira, J Freeman, Z Gecse, E Gottschalk, L Gray, D Green, S Grünendahl, O Gutsche, J Hanlon, R M Harris, S Hasegawa, J Hirschauer, Z Hu, B Jayatilaka, S Jindariani, M Johnson, U Joshi, B Klima, M J Kortelainen, B Kreis, S Lammel, D Lincoln, R Lipton, M Liu, T Liu, J Lykken, K Maeshima, J M Marraffino, D Mason, P McBride, P Merkel, S Mrenna, S Nahn, V O'Dell, K Pedro, C Pena, O Prokofyev, G Rakness, L Ristori, A Savoy-Navarro, B Schneider, E Sexton-Kennedy, A Soha, W J Spalding, L Spiegel, S Stoynev, J Strait, N Strobbe, L Taylor, S Tkaczyk, N V Tran, L Uplegger, E W Vaandering, C Vernieri, M Verzocchi, R Vidal, M Wang, H A Weber, A Whitbeck, D Acosta, P Avery, P Bortignon, D Bourilkov, A Brinkerhoff, L Cadamuro, A Carnes, M Carver, D Curry, R D Field, S V Gleyzer, B M Joshi, J Konigsberg, A Korytov, P Ma, K Matchev, H Mei, G Mitselmakher, K Shi, D Sperka, J Wang, S Wang, Y R Joshi, S Linn, A Ackert, T Adams, A Askew, S Hagopian, V Hagopian, K F Johnson, T Kolberg, G Martinez, T Perry, H Prosper, A Saha, A Santra, V Sharma, R Yohay, M M Baarmand, V Bhopatkar, S Colafranceschi, M Hohlmann, D Noonan, M Rahmani, T Roy, F Yumiceva, M R Adams, L Apanasevich, D Berry, R R Betts, R Cavanaugh, X Chen, S Dittmer, O Evdokimov, C E Gerber, D A Hangal, D J Hofman, K Jung, J Kamin, C Mills, I D Sandoval Gonzalez, M B Tonjes, N Varelas, H Wang, X Wang, Z Wu, J Zhang, M Alhusseini, B Bilki, W Clarida, K Dilsiz, S Durgut, R P Gandrajula, M Haytmyradov, V Khristenko, J-P Merlo, A Mestvirishvili, A Moeller, J Nachtman, H Ogul, Y Onel, F Ozok, A Penzo, C Snyder, E Tiras, J Wetzel, B Blumenfeld, A Cocoros, N Eminizer, D Fehling, L Feng, A V Gritsan, W T Hung, P Maksimovic, J Roskes, U Sarica, M Swartz, M Xiao, C You, A Al-Bataineh, P Baringer, A Bean, S Boren, J Bowen, A Bylinkin, J Castle, S Khalil, A Kropivnitskaya, D Majumder, W Mcbrayer, M Murray, C Rogan, S Sanders, E Schmitz, J D Tapia Takaki, Q Wang, A Ivanov, K Kaadze, D Kim, Y Maravin, D R Mendis, T Mitchell, A Modak, A Mohammadi, L K Saini, N Skhirtladze, F Rebassoo, D Wright, A Baden, O Baron, A Belloni, S C Eno, Y Feng, C Ferraioli, N J Hadley, S Jabeen, G Y Jeng, R G Kellogg, J Kunkle, A C Mignerey, F Ricci-Tam, Y H Shin, A Skuja, S C Tonwar, K Wong, D Abercrombie, B Allen, V Azzolini, A Baty, G Bauer, R Bi, S Brandt, W Busza, I A Cali, M D'Alfonso, Z Demiragli, G Gomez Ceballos, M Goncharov, P Harris, D Hsu, M Hu, Y Iiyama, G M Innocenti, M Klute, D Kovalskyi, Y-J Lee, P D Luckey, B Maier, A C Marini, C Mcginn, C Mironov, S Narayanan, X Niu, C Paus, C Roland, G Roland, G S F Stephans, K Sumorok, K Tatar, D Velicanu, J Wang, T W Wang, B Wyslouch, S Zhaozhong, A C Benvenuti, R M Chatterjee, A Evans, P Hansen, S Kalafut, Y Kubota, Z Lesko, J Mans, S Nourbakhsh, N Ruckstuhl, R Rusack, J Turkewitz, M A Wadud, J G Acosta, S Oliveros, E Avdeeva, K Bloom, D R Claes, C Fangmeier, F Golf, R Gonzalez Suarez, R Kamalieddin, I Kravchenko, J Monroy, J E Siado, G R Snow, B Stieger, A Godshalk, C Harrington, I Iashvili, A Kharchilava, D Nguyen, A Parker, S Rappoccio, B Roozbahani, G Alverson, E Barberis, C Freer, A Hortiangtham, D M Morse, T Orimoto, R Teixeira De Lima, T Wamorkar, B Wang, A Wisecarver, D Wood, S Bhattacharya, O Charaf, K A Hahn, N Mucia, N Odell, M H Schmitt, K Sung, M Trovato, M Velasco, R Bucci, N Dev, M Hildreth, K Hurtado Anampa, C Jessop, D J Karmgard, N Kellams, K Lannon, W Li, N Loukas, N Marinelli, F Meng, C Mueller, Y Musienko, M Planer, A Reinsvold, R Ruchti, P Siddireddy, G Smith, S Taroni, M Wayne, A Wightman, M Wolf, A Woodard, J Alimena, L Antonelli, B Bylsma, L S Durkin, S Flowers, B Francis, A Hart, C Hill, W Ji, T Y Ling, W Luo, B L Winer, H W Wulsin, S Cooperstein, P Elmer, J Hardenbrook, P Hebda, S Higginbotham, A Kalogeropoulos, D Lange, M T Lucchini, J Luo, D Marlow, K Mei, I Ojalvo, J Olsen, C Palmer, P Piroué, J Salfeld-Nebgen, D Stickland, C Tully, S Malik, S Norberg, A Barker, V E Barnes, S Das, L Gutay, M Jones, A W Jung, A Khatiwada, B Mahakud, D H Miller, N Neumeister, C C Peng, H Qiu, J F Schulte, J Sun, F Wang, R Xiao, W Xie, T Cheng, J Dolen, N Parashar, Z Chen, K M Ecklund, S Freed, F J M Geurts, M Kilpatrick, W Li, B Michlin, B P Padley, J Roberts, J Rorie, W Shi, Z Tu, J Zabel, A Zhang, A Bodek, P de Barbaro, R Demina, Y T Duh, J L Dulemba, C Fallon, T Ferbel, M Galanti, A Garcia-Bellido, J Han, O Hindrichs, A Khukhunaishvili, K H Lo, P Tan, R Taus, M Verzetti, A Agapitos, J P Chou, Y Gershtein, T A Gómez Espinosa, E Halkiadakis, M Heindl, E Hughes, S Kaplan, R Kunnawalkam Elayavalli, S Kyriacou, A Lath, R Montalvo, K Nash, M Osherson, H Saka, S Salur, S Schnetzer, D Sheffield, S Somalwar, R Stone, S Thomas, P Thomassen, M Walker, A G Delannoy, J Heideman, G Riley, K Rose, S Spanier, K Thapa, O Bouhali, A Castaneda Hernandez, A Celik, M Dalchenko, M De Mattia, A Delgado, S Dildick, R Eusebi, J Gilmore, T Huang, T Kamon, S Luo, R Mueller, Y Pakhotin, R Patel, A Perloff, L Perniè, D Rathjens, A Safonov, A Tatarinov, N Akchurin, J Damgov, F De Guio, P R Dudero, S Kunori, K Lamichhane, S W Lee, T Mengke, S Muthumuni, T Peltola, S Undleeb, I Volobouev, Z Wang, S Greene, A Gurrola, R Janjam, W Johns, C Maguire, A Melo, H Ni, K Padeken, J D Ruiz Alvarez, P Sheldon, S Tuo, J Velkovska, M Verweij, Q Xu, M W Arenton, P Barria, B Cox, R Hirosky, M Joyce, A Ledovskoy, H Li, C Neu, T Sinthuprasith, Y Wang, E Wolfe, F Xia, R Harr, P E Karchin, N Poudyal, J Sturdy, P Thapa, S Zaleski, M Brodski, J Buchanan, C Caillol, D Carlsmith, S Dasu, L Dodd, S Duric, B Gomber, M Grothe, M Herndon, A Hervé, U Hussain, P Klabbers, A Lanaro, A Levine, K Long, R Loveless, T Ruggles, A Savin, N Smith, W H Smith, N Woods,

Affiliations

  1. Yerevan Physics Institute, Yerevan, Armenia.
  2. Institut für Hochenergiephysik, Wien, Austria.
  3. Institute for Nuclear Problems, Minsk, Belarus.
  4. Universiteit Antwerpen, Antwerpen, Belgium.
  5. Vrije Universiteit Brussel, Brussel, Belgium.
  6. Université Libre de Bruxelles, Bruxelles, Belgium.
  7. Ghent University, Ghent, Belgium.
  8. Université Catholique de Louvain, Louvain-la-Neuve, Belgium.
  9. Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, Brazil.
  10. Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil.
  11. Universidade Estadual Paulista, São Paulo, Brazil.
  12. Universidade Federal do ABC, São Paulo, Brazil.
  13. Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia, Bulgaria.
  14. University of Sofia, Sofia, Bulgaria.
  15. Beihang University, Beijing, China.
  16. Institute of High Energy Physics, Beijing, China.
  17. State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China.
  18. Tsinghua University, Beijing, China.
  19. Universidad de Los Andes, Bogota, Colombia.
  20. University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Split, Croatia.
  21. University of Split, Faculty of Science, Split, Croatia.
  22. Institute Rudjer Boskovic, Zagreb, Croatia.
  23. University of Cyprus, Nicosia, Cyprus.
  24. Charles University, Prague, Czech Republic.
  25. Escuela Politecnica Nacional, Quito, Ecuador.
  26. Universidad San Francisco de Quito, Quito, Ecuador.
  27. Academy of Scientific Research and Technology of the Arab Republic of Egypt, Egyptian Network of High Energy Physics, Cairo, Egypt.
  28. National Institute of Chemical Physics and Biophysics, Tallinn, Estonia.
  29. Department of Physics, University of Helsinki, Helsinki, Finland.
  30. Helsinki Institute of Physics, Helsinki, Finland.
  31. Lappeenranta University of Technology, Lappeenranta, Finland.
  32. IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France.
  33. Laboratoire Leprince-Ringuet, Ecole polytechnique, CNRS/IN2P3, Université Paris-Saclay, Palaiseau, France.
  34. Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France.
  35. Centre de Calcul de l'Institut National de Physique Nucleaire et de Physique des Particules, CNRS/IN2P3, Villeurbanne, France.
  36. Université de Lyon, Université Claude Bernard Lyon 1, CNRS-IN2P3, Institut de Physique Nucléaire de Lyon, Villeurbanne, France.
  37. Georgian Technical University, Tbilisi, Georgia.
  38. Tbilisi State University, Tbilisi, Georgia.
  39. RWTH Aachen University, I. Physikalisches Institut, Aachen, Germany.
  40. RWTH Aachen University, III. Physikalisches Institut A, Aachen, Germany.
  41. RWTH Aachen University, III. Physikalisches Institut B, Aachen, Germany.
  42. Deutsches Elektronen-Synchrotron, Hamburg, Germany.
  43. University of Hamburg, Hamburg, Germany.
  44. Karlsruher Institut fuer Technology, Karlsruhe, Germany.
  45. Institute of Nuclear and Particle Physics (INPP), NCSR Demokritos, Aghia Paraskevi, Greece.
  46. National and Kapodistrian University of Athens, Athens, Greece.
  47. National Technical University of Athens, Athens, Greece.
  48. University of Ioánnina, Ioánnina, Greece.
  49. MTA-ELTE Lendület CMS Particle and Nuclear Physics Group, Eötvös Loránd University, Budapest, Hungary.
  50. Wigner Research Centre for Physics, Budapest, Hungary.
  51. Institute of Nuclear Research ATOMKI, Debrecen, Hungary.
  52. Institute of Physics, University of Debrecen, Debrecen, Hungary.
  53. Indian Institute of Science (IISc), Bangalore, India.
  54. National Institute of Science Education and Research, HBNI, Bhubaneswar, India.
  55. Panjab University, Chandigarh, India.
  56. University of Delhi, Delhi, India.
  57. Saha Institute of Nuclear Physics, HBNI, Kolkata,India.
  58. Indian Institute of Technology Madras, Madras, India.
  59. Bhabha Atomic Research Centre, Mumbai, India.
  60. Tata Institute of Fundamental Research-A, Mumbai, India.
  61. Tata Institute of Fundamental Research-B, Mumbai, India.
  62. Indian Institute of Science Education and Research (IISER), Pune, India.
  63. Institute for Research in Fundamental Sciences (IPM), Tehran, Iran.
  64. University College Dublin, Dublin, Ireland.
  65. INFN Sezione di Bari, Bari, Italy.
  66. Università di Bari, Bari, Italy.
  67. Politecnico di Bari, Bari, Italy.
  68. INFN Sezione di Bologna, Bologna, Italy.
  69. Università di Bologna, Bologna, Italy.
  70. INFN Sezione di Catania, Catania, Italy.
  71. Università di Catania, Catania, Italy.
  72. INFN Sezione di Firenze, Firenze, Italy.
  73. Università di Firenze, Firenze, Italy.
  74. INFN Laboratori Nazionali di Frascati, Frascati, Italy.
  75. INFN Sezione di Genova, Genova, Italy.
  76. Università di Genova, Genova, Italy.
  77. INFN Sezione di Milano-Bicocca, Milano, Italy.
  78. Università di Milano-Bicocca, Milano, Italy.
  79. INFN Sezione di Napoli, Napoli, Italy.
  80. Università della Basilicata, Potenza, Italy.
  81. Università di Napoli 'Federico II', Napoli, Italy.
  82. Università G. Marconi, Roma, Italy.
  83. INFN Sezione di Padova, Padova, Italy.
  84. Università di Padova, Padova, Italy.
  85. INFN Sezione di Pavia, Pavia, Italy.
  86. Università di Pavia, Pavia, Italy.
  87. INFN Sezione di Perugia, Perugia, Italy.
  88. Università di Perugia, Perugia, Italy.
  89. INFN Sezione di Pisa, Pisa, Italy.
  90. Università di Pisa, Pisa, Italy.
  91. Scuola Normale Superiore di Pisa, Pisa, Italy.
  92. INFN Sezione di Roma, Rome, Italy.
  93. Sapienza Università di Roma, Rome, Italy.
  94. INFN Sezione di Torino, Torino, Italy.
  95. Università di Torino, Torino, Italy.
  96. Università del Piemonte Orientale, Novara, Italy.
  97. INFN Sezione di Trieste, Trieste, Italy.
  98. Università di Trieste, Trieste, Italy.
  99. Kyungpook National University, Daegu, Korea.
  100. Chonnam National University, Institute for Universe and Elementary Particles, Kwangju, Korea.
  101. Hanyang University, Seoul, Korea.
  102. Korea University, Seoul, Korea.
  103. Sejong University, Seoul, Korea.
  104. Seoul National University, Seoul, Korea.
  105. University of Seoul, Seoul, Korea.
  106. Sungkyunkwan University, Suwon, Korea.
  107. Vilnius University, Vilnius, Lithuania.
  108. National Centre for Particle Physics, Universiti Malaya, Kuala Lumpur, Malaysia.
  109. Centro de Investigacion y de Estudios Avanzados del IPN, Mexico City, Mexico.
  110. Universidad Iberoamericana, Mexico City, Mexico.
  111. Benemerita Universidad Autonoma de Puebla, Puebla, Mexico.
  112. Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico.
  113. University of Auckland, Auckland, New Zealand.
  114. University of Canterbury, Christchurch, New Zealand.
  115. National Centre for Physics, Quaid-I-Azam University, Islamabad, Pakistan.
  116. National Centre for Nuclear Research, Swierk, Poland.
  117. Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland.
  118. Laboratório de Instrumentação e Física Experimental de Partículas, Lisboa, Portugal.
  119. Joint Institute for Nuclear Research, Dubna, Russia.
  120. Petersburg Nuclear Physics Institute, Gatchina (St. Petersburg), Russia.
  121. Institute for Nuclear Research, Moscow, Russia.
  122. Institute for Theoretical and Experimental Physics, Moscow, Russia.
  123. Moscow Institute of Physics and Technology, Moscow, Russia.
  124. National Research Nuclear University 'Moscow Engineering Physics Institute' (MEPhI), Moscow, Russia.
  125. P.N. Lebedev Physical Institute, Moscow, Russia.
  126. Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia.
  127. Novosibirsk State University (NSU), Novosibirsk, Russia.
  128. State Research Center of Russian Federation, Institute for High Energy Physics of NRC "Kurchatov Institute", Protvino, Russia.
  129. National Research Tomsk Polytechnic University, Tomsk, Russia.
  130. University of Belgrade, Faculty of Physics and Vinca Institute of Nuclear Sciences, Belgrade, Serbia.
  131. Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain.
  132. Universidad Autónoma de Madrid, Madrid, Spain.
  133. Universidad de Oviedo, Oviedo, Spain.
  134. Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander, Spain.
  135. CERN, European Organization for Nuclear Research, Geneva, Switzerland.
  136. Paul Scherrer Institut, Villigen, Switzerland.
  137. ETH Zurich-Institute for Particle Physics and Astrophysics (IPA), Zurich, Switzerland.
  138. Universität Zürich, Zurich, Switzerland.
  139. National Central University, Chung-Li, Taiwan.
  140. National Taiwan University (NTU), Taipei, Taiwan.
  141. Chulalongkorn University, Faculty of Science, Department of Physics, Bangkok, Thailand.
  142. Çukurova University, Physics Department, Science and Art Faculty, Adana, Turkey.
  143. Middle East Technical University, Physics Department, Ankara, Turkey.
  144. Bogazici University, Istanbul, Turkey.
  145. Istanbul Technical University, Istanbul, Turkey.
  146. Institute for Scintillation Materials of National Academy of Science of Ukraine, Kharkov, Ukraine.
  147. National Scientific Center, Kharkov Institute of Physics and Technology, Kharkov, Ukraine.
  148. University of Bristol, Bristol, United Kingdom.
  149. Rutherford Appleton Laboratory, Didcot, United Kingdom.
  150. Imperial College, London, United Kingdom.
  151. Brunel University, Uxbridge, United Kingdom.
  152. Baylor University, Waco, USA.
  153. Catholic University of America, Washington DC, USA.
  154. The University of Alabama, Tuscaloosa, USA.
  155. Boston University, Boston, USA.
  156. Brown University, Providence, USA.
  157. University of California, Davis, Davis, USA.
  158. University of California, Los Angeles, USA.
  159. University of California, Riverside, Riverside, USA.
  160. University of California, San Diego, La Jolla, USA.
  161. University of California, Santa Barbara-Department of Physics, Santa Barbara, USA.
  162. California Institute of Technology, Pasadena, USA.
  163. Carnegie Mellon University, Pittsburgh, USA.
  164. University of Colorado Boulder, Boulder, USA.
  165. Cornell University, Ithaca, USA.
  166. Fermi National Accelerator Laboratory, Batavia, USA.
  167. University of Florida, Gainesville, USA.
  168. Florida International University, Miami, USA.
  169. Florida State University, Tallahassee, USA.
  170. Florida Institute of Technology, Melbourne, USA.
  171. University of Illinois at Chicago (UIC), Chicago, USA.
  172. The University of Iowa, Iowa City, USA.
  173. Johns Hopkins University, Baltimore, USA.
  174. The University of Kansas, Lawrence, USA.
  175. Kansas State University, Manhattan, USA.
  176. Lawrence Livermore National Laboratory, Livermore, USA.
  177. University of Maryland, College Park, USA.
  178. Massachusetts Institute of Technology, Cambridge, USA.
  179. University of Minnesota, Minneapolis, USA.
  180. University of Mississippi, Oxford, USA.
  181. University of Nebraska-Lincoln, Lincoln, USA.
  182. State University of New York at Buffalo, Buffalo, USA.
  183. Northeastern University, Boston, USA.
  184. Northwestern University, Evanston, USA.
  185. University of Notre Dame, Notre Dame, USA.
  186. The Ohio State University, Columbus, USA.
  187. Princeton University, Princeton, USA.
  188. University of Puerto Rico, Mayaguez, USA.
  189. Purdue University, West Lafayette, USA.
  190. Purdue University Northwest, Hammond, USA.
  191. Rice University, Houston, USA.
  192. University of Rochester, Rochester, USA.
  193. Rutgers, The State University of New Jersey, Piscataway, USA.
  194. University of Tennessee, Knoxville, USA.
  195. Texas A&M University, College Station, USA.
  196. Texas Tech University, Lubbock, USA.
  197. Vanderbilt University, Nashville, USA.
  198. University of Virginia, Charlottesville, USA.
  199. Wayne State University, Detroit, USA.
  200. University of Wisconsin-Madison, Madison, Wisconsin, USA.

PMID: 30339440 DOI: 10.1103/PhysRevLett.121.141801

Abstract

This Letter presents the observation of the rare Z boson decay Z→ψℓ^{+}ℓ^{-}. Here, ψ represents contributions from direct J/ψ and ψ(2S)→J/ψX, ℓ^{+}ℓ^{-} is a pair of electrons or muons, and the J/ψ meson is detected via its decay to μ^{+}μ^{-}. The sample of proton-proton collision data, collected by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV, corresponds to an integrated luminosity of 35.9  fb^{-1}. The signal is observed with a significance in excess of 5 standard deviations. After subtraction of the ψ(2S)→J/ψX contribution, the ratio of the branching fraction of the exclusive decay Z→J/ψℓ^{+}ℓ^{-} to the decay Z→μ^{+}μ^{-}μ^{+}μ^{-} within a fiducial phase space is measured to be B(Z→J/ψℓ^{+}ℓ^{-})/B(Z→μ^{+}μ^{-}μ^{+}μ^{-})=0.67±0.18(stat)±0.05(syst).

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