Observation of the Z$\to\psi\ell^+\ell^-$ decay in pp collisions at $\sqrt{s}=$ 13 TeV
Creators: name: Sirunyan, Albert M
name: Tumasyan, Armen
name: Adam, Wolfgang
name: Ambrogi, Federico
name: Asilar, Ece
name: Bergauer, Thomas
name: Brandstetter, Johannes
name: Brondolin, Erica
name: Dragicevic, Marko
name: ErÃ¶, Janos
name: Escalante Del Valle, Alberto
name: Flechl, Martin
name: Fruehwirth, Rudolf
name: Ghete, Vasile Mihai
name: Hrubec, Josef
name: Jeitler, Manfred
name: Krammer, Natascha
name: KrÃ¤Tschmer, Ilse
name: Liko, Dietrich
name: Madlener, Thomas
name: Mikulec, Ivan
name: Rad, Navid
name: Rohringer, Herbert
name: Schieck, Jochen
name: SchÃ¶Fbeck, Robert
name: Spanring, Markus
name: Spitzbart, Daniel
name: Taurok, Anton
name: Waltenberger, Wolfgang
name: Wittmann, Johannes
name: Wulz, Claudia-Elisabeth
name: Zarucki, Mateusz
name: Chekhovsky, Vladimir
name: Mossolov, Vladimir
name: Suarez Gonzalez, Juan
name: De Wolf, Eddi A
name: Di Croce, Davide
name: Janssen, Xavier
name: Lauwers, Jasper
name: Pieters, Maxim
name: Van De Klundert, Merijn
name: Van Haevermaet, Hans
name: Van Mechelen, Pierre
name: Van Remortel, Nick
name: Abu Zeid, Shimaa
name: Blekman, Freya
name: D'Hondt, Jorgen
name: De Bruyn, Isabelle
name: De Clercq, Jarne
name: Deroover, Kevin
name: Flouris, Giannis
name: Lontkovskyi, Denys
name: Lowette, Steven
name: Marchesini, Ivan
name: Moortgat, Seth
name: Moreels, Lieselotte
name: Python, Quentin
name: Skovpen, Kirill
name: Tavernier, Stefaan
name: Van Doninck, Walter
name: Van Mulders, Petra
name: Van Parijs, Isis
name: Beghin, Diego
name: Bilin, Bugra
name: Brun, Hugues
name: Clerbaux, Barbara
name: De Lentdecker, Gilles
name: Delannoy, Hugo
name: Dorney, Brian
name: Fasanella, Giuseppe
name: Favart, Laurent
name: Goldouzian, Reza
name: Grebenyuk, Anastasia
name: Kalsi, Amandeep Kaur
name: Lenzi, Thomas
name: Luetic, Jelena
name: Postiau, Nicolas
name: Starling, Elizabeth
name: Thomas, Laurent
name: Vander Velde, Catherine
name: Vanlaer, Pascal
name: Vannerom, David
name: Wang, Qun
name: Cornelis, Tom
name: Dobur, Didar
name: Fagot, Alexis
name: Gul, Muhammad
name: Khvastunov, Illia
name: Poyraz, Deniz
name: Roskas, Christos
name: Trocino, Daniele
name: Tytgat, Michael
name: Verbeke, Willem
name: Vermassen, Basile
name: Vit, Martina
name: Zaganidis, Nicolas
name: Bakhshiansohi, Hamed
name: Bondu, Olivier
name: Brochet, SÃ©Bastien
name: Bruno, Giacomo
name: Caputo, Claudio
name: David, Pieter
name: Delaere, Christophe
name: Delcourt, Martin
name: Francois, Brieuc
name: Giammanco, Andrea
name: Krintiras, Georgios
name: Lemaitre, Vincent
name: Magitteri, Alessio
name: Mertens, Alexandre
name: Musich, Marco
name: Piotrzkowski, Krzysztof
name: Saggio, Alessia
name: Vidal Marono, Miguel
name: Wertz, SÃ©Bastien
name: Zobec, Joze
name: Alves, FÃ¡Bio LÃºcio
name: Alves, Gilvan
name: Brito, Lucas
name: Correia Silva, Gilson
name: Hensel, Carsten
name: Moraes, Arthur
name: Pol, Maria Elena
name: Rebello Teles, Patricia
name: Belchior Batista Das Chagas, Ewerton
name: Carvalho, Wagner
name: Chinellato, Jose
name: Coelho, Eduardo
name: Melo Da Costa, Eliza
name: Da Silveira, Gustavo Gil
name: De Jesus Damiao, Dilson
name: De Oliveira Martins, Carley
name: Fonseca De Souza, Sandro
name: Malbouisson, Helena
name: Matos Figueiredo, Diego
name: Melo De Almeida, Miqueias
name: Mora Herrera, Clemencia
name: Mundim, Luiz
name: Nogima, Helio
name: Prado Da Silva, Wanda Lucia
name: Sanchez Rosas, Luis Junior
name: Santoro, Alberto
name: Sznajder, Andre
name: Thiel, Mauricio
name: Tonelli Manganote, Edmilson JosÃ©
name: Torres Da Silva De Araujo, Felipe
name: Vilela Pereira, Antonio
name: Ahuja, Sudha
name: Bernardes, Cesar Augusto
name: Calligaris, Luigi
name: Tomei, Thiago
name: De Moraes Gregores, Eduardo
name: Mercadante, Pedro G
name: Novaes, Sergio F
name: Padula, Sandra
name: Romero Abad, David
name: Aleksandrov, Aleksandar
name: Hadjiiska, Roumyana
name: Iaydjiev, Plamen
name: Marinov, Andrey
name: Misheva, Milena
name: Rodozov, Mircho
name: Shopova, Mariana
name: Sultanov, Georgi
name: Dimitrov, Anton
name: Litov, Leander
name: Pavlov, Borislav
name: Petkov, Peicho
name: Fang, Wenxing
name: Gao, Xuyang
name: Yuan, Li
name: Ahmad, Muhammad
name: Bian, Jian-Guo
name: Chen, Guo-Ming
name: Chen, He-Sheng
name: Chen, Mingshui
name: Chen, Ye
name: Jiang, Chun-Hua
name: Leggat, Duncan
name: Liao, Hongbo
name: Liu, Zhenan
name: Romeo, Francesco
name: Shaheen, Sarmad Masood
name: Spiezia, Aniello
name: Tao, Junquan
name: Wang, Chunjie
name: Wang, Zheng
name: Yazgan, Efe
name: Zhang, Huaqiao
name: Zhao, Jingzhou
name: Ban, Yong
name: Chen, Geng
name: Levin, Andrew
name: Li, Jing
name: Li, Linwei
name: Li, Qiang
name: Mao, Yajun
name: Qian, Si-Jin
name: Wang, Dayong
name: Xu, Zijun
name: Wang, Yi
name: Avila, Carlos
name: Cabrera, AndrÃ©S
name: Carrillo Montoya, Camilo Andres
name: Chaparro Sierra, Luisa Fernanda
name: Florez, Carlos
name: GonzÃ¡Lez HernÃ¡Ndez, Carlos Felipe
name: Segura Delgado, Manuel Alejandro
name: Courbon, Benoit
name: Godinovic, Nikola
name: Lelas, Damir
name: Puljak, Ivica
name: Sculac, Toni
name: Antunovic, Zeljko
name: Kovac, Marko
name: Brigljevic, Vuko
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name: Kadija, Kreso
name: Mesic, Benjamin
name: Starodumov, Andrei
name: Susa, Tatjana
name: Ather, Mohsan Waseem
name: Attikis, Alexandros
name: Kolosova, Marina
name: Mavromanolakis, Georgios
name: Mousa, Jehad
name: Nicolaou, Charalambos
name: Ptochos, Fotios
name: Razis, Panos A
name: Rykaczewski, Hans
name: Finger, Miroslav
name: Finger Jr, Michael
name: Ayala, Edy
name: Carrera Jarrin, Edgar
name: Assran, Yasser
name: Mahrous, Ayman
name: Mohammed, Yasser
name: Bhowmik, Sandeep
name: Carvalho Antunes De Oliveira, Alexandra
name: Dewanjee, Ram Krishna
name: Ehataht, Karl
name: Kadastik, Mario
name: Raidal, Martti
name: Veelken, Christian
name: Eerola, Paula
name: Kirschenmann, Henning
name: Pekkanen, Juska
name: Voutilainen, Mikko
name: Havukainen, Joona
name: HeikkilÃ¤, Jaana Kristiina
name: Jarvinen, Terhi
name: KarimÃ¤Ki, Veikko
name: Kinnunen, Ritva
name: LampÃ©N, Tapio
name: Lassila-Perini, Kati
name: Laurila, Santeri
name: Lehti, Sami
name: LindÃ©N, Tomas
name: Luukka, Panja-Riina
name: MÃ¤EnpÃ¤Ã¤, Teppo
name: Siikonen, Hannu
name: Tuominen, Eija
name: Tuominiemi, Jorma
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name: Besancon, Marc
name: Couderc, Fabrice
name: Dejardin, Marc
name: Denegri, Daniel
name: Faure, Jean-Louis
name: Ferri, Federico
name: Ganjour, Serguei
name: Givernaud, Alain
name: Gras, Philippe
name: Hamel De Monchenault, Gautier
name: Jarry, Patrick
name: Leloup, ClÃ©Ment
name: Locci, Elizabeth
name: Malcles, Julie
name: Negro, Giulia
name: Rander, John
name: Rosowsky, AndrÃ©
name: Sahin, Mehmet ÃZgÃ¼r
name: Titov, Maksym
name: Abdulsalam, Abdulla
name: Amendola, Chiara
name: Antropov, Iurii
name: Beaudette, Florian
name: Busson, Philippe
name: Charlot, Claude
name: Granier De Cassagnac, Raphael
name: Kucher, Inna
name: Lisniak, Stanislav
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name: Nguyen, Matthew
name: Ochando, Christophe
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name: Salerno, Roberto
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name: Stahl Leiton, Andre Govinda
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name: Zghiche, Amina
name: Agram, Jean-Laurent
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name: Brom, Jean-Marie
name: Chabert, Eric Christian
name: Cherepanov, Vladimir
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name: JansovÃ¡, MarkÃ©Ta
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name: Beauceron, Stephanie
name: Bernet, Colin
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name: Finco, Linda
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name: Feld, Lutz
name: Kiesel, Maximilian Knut
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name: Lipinski, Martin
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name: Rauch, Max Philip
name: Schomakers, Christian
name: Schulz, Johannes
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name: Nehrkorn, Alexander
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name: Pistone, Claudia
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name: Sert, Hale
name: Stahl, Achim
name: Aldaya Martin, Maria
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name: Asawatangtrakuldee, Chayanit
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name: Beernaert, Kelly
name: Behnke, Olaf
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name: BermÃºdez MartÃ­Nez, Armando
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name: Connor, Patrick
name: Contreras-Campana, Christian
name: Costanza, Francesco
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name: Stefaniuk, Nazar
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name: Dierlamm, Alexander
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name: Giffels, Manuel
name: Harrendorf, Marco Alexander
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name: Heindl, Stefan Michael
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name: Simonis, Hans-JÃ¼rgen
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name: Weiler, Thomas
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name: Triantis, Frixos A
name: Tsitsonis, Dimitrios
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name: Filipovic, Nicolas
name: Major, PÃ©Ter
name: Nagy, Marton Imre
name: Pasztor, Gabriella
name: SurÃ¡Nyi, OlivÃ©R
name: Veres, Gabor Istvan
name: Bencze, Gyorgy
name: Hajdu, Csaba
name: Horvath, Dezso
name: Hunyadi, ÃDÃ¡M
name: Sikler, Ferenc
name: VÃ¡Mi, TamÃ¡S ÃLmos
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name: Beni, Noemi
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name: Kumar, Ramandeep
name: Kumari, Priyanka
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name: Sandeep, Kaur
name: Sharma, Sandeep
name: Singh, Jasbir
name: Walia, Genius
name: Bhardwaj, Ashutosh
name: Choudhary, Brajesh C
name: Garg, Rocky Bala
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name: Keshri, Sumit
name: Kumar, Ashok
name: Malhotra, Shivali
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name: Sharma, Ramkrishna
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name: Bharti, Monika
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name: Rout, Prasant Kumar
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name: Roy Chowdhury, Suvankar
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name: Singh, Bipen
name: Thakur, Shalini
name: Behera, Prafulla Kumar
name: Chudasama, Ruchi
name: Dutta, Dipanwita
name: Jha, Vishwajeet
name: Kumar, Vineet
name: Netrakanti, Pawan Kumar
name: Pant, Lalit Mohan
name: Shukla, Prashant
name: Aziz, Tariq
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name: Mohanty, Gagan Bihari
name: Sur, Nairit
name: Sutar, Bajrang
name: Ravindra Kumar Verma, Ravindra
name: Banerjee, Sudeshna
name: Bhattacharya, Soham
name: Chatterjee, Suman
name: Das, Pallabi
name: Guchait, Monoranjan
name: Jain, Sandhya
name: Karmakar, Saikat
name: Kumar, Sanjeev
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name: Kapoor, Anshul
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name: Pandey, Shubham
name: Rane, Aditee
name: Sharma, Seema
name: Chenarani, Shirin
name: Eskandari Tadavani, Esmaeel
name: Etesami, Seyed Mohsen
name: Khakzad, Mohsen
name: Mohammadi Najafabadi, Mojtaba
name: Naseri, Mohsen
name: Rezaei Hosseinabadi, Ferdos
name: Safarzadeh, Batool
name: Zeinali, Maryam
name: Felcini, Marta
name: Grunewald, Martin
name: Abbrescia, Marcello
name: Calabria, Cesare
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name: Creanza, Donato
name: Cristella, Leonardo
name: De Filippis, Nicola
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name: Di Florio, Adriano
name: Errico, Filippo
name: Fiore, Luigi
name: Gelmi, Andrea
name: Iaselli, Giuseppe
name: Lezki, Samet
name: Maggi, Giorgio
name: Maggi, Marcello
name: Miniello, Giorgia
name: My, Salvatore
name: Nuzzo, Salvatore
name: Pompili, Alexis
name: Pugliese, Gabriella
name: Radogna, Raffaella
name: Ranieri, Antonio
name: Selvaggi, Giovanna
name: Sharma, Archana
name: Silvestris, Lucia
name: Venditti, Rosamaria
name: Verwilligen, Piet
name: Zito, Giuseppe
name: Abbiendi, Giovanni
name: Battilana, Carlo
name: Bonacorsi, Daniele
name: Borgonovi, Lisa
name: Braibant-Giacomelli, Sylvie
name: Campanini, Renato
name: Capiluppi, Paolo
name: Castro, Andrea
name: Cavallo, Francesca Romana
name: Chhibra, Simranjit Singh
name: Ciocca, Claudia
name: Codispoti, Giuseppe
name: Cuffiani, Marco
name: Dallavalle, Gaetano-Marco
name: Fabbri, Fabrizio
name: Fanfani, Alessandra
name: Giacomelli, Paolo
name: Grandi, Claudio
name: Guiducci, Luigi
name: Iemmi, Fabio
name: Marcellini, Stefano
name: Masetti, Gianni
name: Montanari, Alessandro
name: Navarria, Francesco
name: Perrotta, Andrea
name: Primavera, Federica
name: Rossi, Antonio
name: Rovelli, Tiziano
name: Siroli, Gian Piero
name: Tosi, NicolÃ²
name: Albergo, Sebastiano
name: Di Mattia, Alessandro
name: Potenza, Renato
name: Tricomi, Alessia
name: Tuve, Cristina
name: Barbagli, Giuseppe
name: Chatterjee, Kalyanmoy
name: Ciulli, Vitaliano
name: Civinini, Carlo
name: D'Alessandro, Raffaello
name: Focardi, Ettore
name: Latino, Giuseppe
name: Lenzi, Piergiulio
name: Meschini, Marco
name: Paoletti, Simone
name: Russo, Lorenzo
name: Sguazzoni, Giacomo
name: Strom, Derek
name: Viliani, Lorenzo
name: Benussi, Luigi
name: Bianco, Stefano
name: Fabbri, Franco
name: Piccolo, Davide
name: Ferro, Fabrizio
name: Ravera, Fabio
name: Robutti, Enrico
name: Tosi, Silvano
name: Benaglia, Andrea
name: Beschi, Andrea
name: Brianza, Luca
name: Brivio, Francesco
name: Ciriolo, Vincenzo
name: Di Guida, Salvatore
name: Dinardo, Mauro Emanuele
name: Fiorendi, Sara
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name: RabadÃ¡N-Trejo, RaÃºl Iraq
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name: Oropeza Barrera, Cristina
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name: Hollar, Jonathan
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name: Dordevic, Milos
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name: Bachiller, Irene
name: Barrio Luna, Mar
name: Brochero Cifuentes, Javier Andres
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name: Colino, Nicanor
name: De La Cruz, Begona
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name: Albajar, Carmen
name: De TrocÃ³niz, Jorge F
name: Cuevas, Javier
name: Erice, Carlos
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name: Folgueras, Santiago
name: Gonzalez Caballero, Isidro
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name: RodrÃ­Guez Bouza, VÃ­Ctor
name: Sanchez Cruz, Sergio
name: Vischia, Pietro
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name: Cabrillo, Iban Jose
name: Calderon, Alicia
name: Chazin Quero, Barbara
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name: FernÃ¡Ndez Manteca, Pedro JosÃ©
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name: Gomez, Gervasio
name: Lopez Virto, Amparo
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name: Martinez Rivero, Celso
name: Martinez Ruiz Del Arbol, Pablo
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name: Vila, Ivan
name: Vilar Cortabitarte, Rocio
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name: Daponte, Vincenzo
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name: Orfanelli, Styliani
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name: Rabady, Dinyar
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name: Seidel, Markus
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name: Sphicas, Paraskevas
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name: Tsirou, Andromachi
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name: Pauss, Felicitas
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name: SchÃ¶Nenberger, Myriam
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name: Buchanan, James
name: Caillol, CÃ©Cile
name: Carlsmith, Duncan
name: Dasu, Sridhara
name: Dodd, Laura
name: Duric, Senka
name: Gomber, Bhawna
name: Grothe, Monika
name: Herndon, Matthew
name: HervÃ©, Alain
name: Hussain, Usama
name: Klabbers, Pamela
name: Lanaro, Armando
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Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2018
Subjects: p p: scattering
Z0: decay
branching ratio: ratio
CERN LHC Coll
phase space
electron
meson
muon
CMS

description: This Letter presents the observation of the rare Z boson decay Z$\to\psi\ell^+\ell^-$. Here, $\psi$ represents contributions from direct J/$\psi$ and J/$\psi$$\to$ J$\psi X$, $\ell^+\ell^-$ is a pair of electrons or muons, and the J/$\psi$ meson is detected via its decay to $\mu^+\mu^-$. 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 $\psi$(2S) $\to$J/$\psi X$ contribution, the ratio of the branching fraction of the exclusive decay Z$\to\psi\ell^+\ell^-$ to the decay Z$\to\mu^+\mu^-\mu^+\mu^-$ within a fiducial phase space is measured to be $\mathcal{B}($Z$\to\psi\ell^+\ell^-) / \mathcal{B}($Z$\to\mu^+\mu^-\mu^+\mu^-) =$ 0.67$\pm$ 0.18 (stat) $\pm$ 0.05 (syst).