First polarisation measurement of coherently photoproduced $J/ψ$ in ultra-peripheral Pb–Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV
Shreyasi Acharya, D. Adamová, Alexander Adler, Gianluca Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, S. Ahmad, S. U. Ahn, I. Ahuja, A. Akindinov, Mohammad Al-Turany, Dmitry Aleksandrov, Bruno Alessandro, H. M. Alfanda, Jose Ruben Alfaro Molina, B. Ali, A. Alici, Negin Alizadehvandchali, A. Alkin, J. Alme, Giacomo Alocco, Torsten Alt, Igor Altsybeev, M. N. Anaam, Cristian Andrei, Anton Andronic, V. Anguelov, F. Antinori, P. Antonioli, N. Apadula, L. Aphecetche, Harald Appelshaeuser, C. Arata, Silvia Arcelli, M. Aresti, Roberta Arnaldi, Jhoao Gabriel Martins Campos Almeida Arneiro, Ionut Cristian Arsene, M. Arslandok, Andre Augustinus, R. Averbeck, M. D. Azmi, A. Badalà, Joonsuk Bae, Y. W. Baek, Xiaozhi Bai, R. Bailhache, Y. Bailung, A. Balbino, A. Baldisseri, Bartosz Baliś, D. Banerjee, Z. Banoo, R. Barbera, F. Barile, L. Barioglio, Maria Barlou, G. G. Barnaföldi, L. S. Barnby, Valerie Ramillien Barret, L. Barreto, C. Bartels, K. Barth, Esther Bartsch, N. Bastid, Sumit Basu, G. Batigne, D. Battistini, B. Batyunya, Dibakar Bauri, J. L. Bazo Alba, I. G. Bearden, C. Beattie, P. Becht, D. Behera, Iouri Belikov, A. D. C. Bell Hechavarria, F. Bellini, R. Bellwied, S. Belokurova, V. Belyaev, Gyula Bencedi, S. Beolè, Alexandru Bercuci, Y. Berdnikov, A. Berdnikova, Luisa Bergmann, Mihaela Gabriela Besoiu, L. Betev, Partha Pratim Bhaduri, A. Bhasin, M. A. Bhat, Buddhadeb Bhattacharjee, L. Bianchi, Nicola Bianchi, Jaroslav Bielcik, Jana Bielcikova, Jacek Bogumil Biernat, Alexandre Patrick Bigot, Ante Bilandzic, G. Biro, S. Biswas, N. Bize, Justin Thomas Blair, D. Blau, Mihail Bogdan Blidaru, Nora Bluhme, C. Blume, G. Boca, F. Bock, Tea Bodova, Alexey Bogdanov, S. Boi, J. Bok, L. Boldizsár, M. Bombara, Peter Matthew Bond, Germano Bonomi, H. Borel, A. Borissov, Andres Gerardo Borquez Carcamo, Hannah Bossi, E. Botta, Y. E. M. Bouziani, Lars Bratrud, P. Braun‐Munzinger, Marco Bregant, Michal Broz, G. Bruno, M. D. Buckland, D. Budnikov, Henner Buesching, S. Bufalino, P. Buehler, Edith Zinhle Buthelezi, Aleksandr Bylinkin, Sebastian Adam Bysiak, Mengke Cai, H. Caines, A. Calivà, E. Calvo Villar, Juan Manuel Mejia Camacho, P. Camerini, Fabio de Moraes Canedo, Mihai Carabaș, Aitor Amatriain Carballo, F. Carnesecchi, R. Caron, L. A. D. Carvalho, J. Castillo Castellanos, F. Catalano, Cesar Ceballos Sanchez, I. Chakaberia, Pritam Chakraborty, Sinjini Chandra, S. Chapeland, M. Chartier, Subhasis Chattopadhyay, Sukalyan Chattopadhyay, Tonatiuh García Chàvez, T. Cheng, C. Cheshkov, B. Cheynis, Vasco Miguel Chibante Barroso, David Dobrigkeit Chinellato, E. S. Chizzali, J. Cho, Soyeon Cho, P. Chochula, Panagiotis Christakoglou, Christian Holm Christensen, P. Christiansen, T. Chujo, M. Ciacco, Corrado Cicalo, Federico Cindolo, Michael Rudolf Ciupek, Giulia Clai, F. Colamaria, J. S. Colburn, D. Colella, M. Colocci, Gustavo Conesa Balbastre, Z. Conesa del Valle, Giacomo Contin, Jesus Guillermo Contreras Nuno, M. L. Coquet, Thomas Michael Cormier, P. Cortese, M. R. Cosentino, Filippo Costa, S. Costanza, Corentin Cot, J. Crkovská, Philippe Crochet, R. Cruz-Torres, Pengyao Cui, A. Dainese, Meike Charlotte Danisch, Andrea Danu, Prottay Das, P. Das, Supriya Das, A. Dash, Sadhana Dash, Annalisa De Caro, G. de Cataldo, Jan De Cuveland, A. De Falco, D. De Gruttola, Nora de Marco, Chiara de Martin, S. De Pasquale, Rohaan Deb, Suman Deb, R. J. Debski, Kamil Rafał Deja, R. Del Grande, L. Dello Stritto, W. Deng, P. Dhankher, D. Di Bari, A. Di Mauro, Raúl Arteche Díaz, T. Dietel, Yanchun Ding, R. Divià, Dhruv Utpalkumar Dixit, Oeystein Djuvsland, U. Dmitrieva, A. Dobrin, Benjamin Dönigus, Jan Michal Dubinski, A. Dubla, S. Dudi, P. Dupieux, Martin Durkac, Natalia Dzalaiova, Tabea Maria Eder, R. J. Ehlers, Viljar Nilsen Eikeland, Florian Eisenhut, Domenico Elia, B. Erazmus, F. Ercolessi, F. Erhardt, Magnus Rentsch Ersdal, Bruno Espagnon, Giulio Eulisse, D. Evans, S. Evdokimov, Laura Fabbietti, M. Faggin, J. Faivre, Feng Fan, W. Fan, A. Fantoni, M. Fasel, P. Fecchio, A. Feliciello, Г. Феофилов, A. Fernández Téllez, L. Ferrandi, M. B. Ferrer, A. Ferrero, C. Ferrero, A. Ferretti, Victor Jose Gaston Feuillard, V. Filova, D. Finogeev, F. M. Fionda, F. Flor, Amanda Nicole Flores, Siegfried Valentin Foertsch, Ilya Fokin, S. Fokin, Enrico Fragiacomo, Eszter Frajna, U. Fuchs, N. Funicello, C. Furget, Artur Furs, Takahiro Fusayasu, Jens Joergen Gaardhoeje, M. Gagliardi, Alberto Martin Gago Medina, Carlos Duarte Galvan, D. R. Gangadharan, P. Ganoti, C. Garabatos, Jesus Ricardo Alvarado Garcia, E. García-Solis, Corrado Gargiulo, Katharina Demmich, P. Gasik, A. Gautam, Maria Beatriz de Leone Gay, M. Germain, A. Ghimouz, Chandrasekhar Ghosh, Marco Giacalone, P. Giubellino, P. Giubilato, Aude Marie Camille Glaenzer, P. Glässel, Ewa Glimos, Daniel Jia Qin Goh, V. González, M. Gorgoń, Sven Gotovac, Varlen Grabski, L. K. Graczykowski, E. Grecka, A. Grelli, C. Grigoras, V. Grigoriev, S. Grigoryan, F. Grosa, Jan Fiete Grosse-Oetringhaus, R. Grosso, D. Grund, Gabriel Garcia Guardiano, R. Guernane, M. Guilbaud, Kristján Herlache Gulbrandsen, Tuba Gundem, Taku Gunji, W. Guo, A. Gupta, R. Gupta, Rashi Gupta, S. Paisano-Guzmán, K. Gwizdziel, Laszlo Gyulai, Michael Karim Habib, C. Hadjidakis, Fakhar Ul Haider, H. Hamagaki, A. Hamdi, M. Hamid, Younghoon Han, R. Hannigan, Md Rihan Haque, John William Harris, A. Harton, Hadi Hassan, D. Hatzifotiadou, Philip Hauer, L. B. Havener, Stefan Thomas Heckel, Ernst Hellbär, Haavard Helstrup, Marvin Hemmer, T. Herman, Gerardo Antonio Herrera Corral, Florian Herrmann, S. Herrmann, K. F. Hetland, Benedict Heybeck, H. Hillemanns, B. Hippolyte, Felix Willi Hoffmann, B. Hofman, B. Hohlweger, Geun Hee Hong, M. Horst, Adrian Horzyk, Y. Hou, Peter Zahariev Hristov, Charles Hughes, Patrick Huhn, Laura Maria Huhta, Charlotte van Hulse, T. J. Humanic, Alek Hutson, Dirk Hutter, J. P. Iddon, Radiy Ilkaev, Hira Ilyas, Motoi Inaba, Gian Michele Innocenti, Mikhail Ippolitov, Artem Isakov, T. Isidori, Md Samsul Islam, Marian Ivanov, В. Иванов, M. Jabłoński, Barbara Jacak, N. Jacazio, Peter Martin Jacobs, Slavka Jadlovska, Jan Jadlovsky, Syaefudin Jaelani, Ludwig Albert Jaffe, C. Jahnke, Monika Joanna Jakubowska, M. A. Janik, Thomas Janson, Marko Jerčić, Shihai Jia, Alom Antonio Paz Jimenez, F. Jonas, J. M. Jowett, J. Jung, M. Jung, A. Junique, Anton Jusko, Maja Jadwiga Karwowska, Jetnipit Kaewjai, Peter Kalinak, Annalena Sophie Kalteyer, Alexander Philipp Kalweit, Vladimir Kaplin, A. Karasu Uysal, D. Karatovic, O. Karavichev, T. Karavicheva, P. Karczmarczyk, E. Karpechev, Udo Wolfgang Kebschull, Ralf Keidel, Darius Keijdener, Markus Keil, Bernhard Franz Ketzer, Swapnesh Santosh Khade, Ahsan Mehmood Khan, Shaista Khan, A. Khanzadeev, Y. Kharlov, A. Khatun, A. Khuntia, Miles Brower Kidson, Bjarte Kileng, B. Kim, Chong Kim, D. J. Kim, Eun Joo Kim, J. Kim, Jinsook Kim, Junlee Kim, Minjung Kim, Se Yong Kim, Taejun Kim, K. Kimura, S. Kirsch, I. Kisel, S. Kiselev, A. Kisiel, Jacek Kitowski, Jennifer Lynn Klay, J. Klein, Spencer Robert Klein, C. Klein-Bösing, Matthias Kleiner, Thomas Klemenz, Alexander Kluge, Anders Garritt Knospe, C. Kobdaj, Thorsten Sven Kollegger, Andrey Kondratyev, N. Kondratyeva, Evgeny Kondratyuk, Joshua Leon Konig, Stephan Alexander Konigstorfer, Piotr Jan Konopka, G. Kornakov, Sebastian Dominik Koryciak, Artem Kotliarov, V. Kovalenko, M. Kowalski, V. Kozhuharov, I. Králik, A. Kravčáková, Lubos Krcal, Lukas Kreis, M. Krivda, Filip Krizek, Katarina Krizkova Gajdosova, M. Kroesen, M. Krüger, Diana Mária Krupová, E. Kryshen, V. Kučera, C. Kuhn, P. G. Kuijer, Takuya Kumaoka, Deekshit Kumar, L. Kumar, Navneet Kumar, S. Kumar, Sourav Kundu, Podist Kurashvili, A. Kurepin, A. Kurepin, A. Kuryakin, S. Kushpil, J. Kvapil, M. J. Kweon, Jiyeon Kwon, Y. Kwon, Sarah Louise La Pointe, Paola La Rocca, Anantachai Lakrathok, M. Lamanna, Rune Langoy, P. Larionov, E. Laudi, Lukas Lautner, R. Lavicka, T. Lazareva, R. Lea, H. Lee, G. Legras, Johannes Lehrbach, Tomasz Marcin Lelek, R. C. Lemmon, I. León Monzón, M. M. Lesch, Ezra Douglas Lesser, P. Lévai, Xiaomei Li, Xing Long Li, J. Lien, Roman Lietava, I. Likmeta, Bong-Hwi Lim, Sanghoon Lim, V. Lindenstruth, A. Lindner, C. Lippmann, Alwina Ruixin Liu, D. H. Liu, J. Liu, Ingrid Mckibben Lofnes, Constantinos Loizides, S. Lökòs, Johanna Lomker, P. Loncar, J. A. López, Xavier Bernard Lopez, E. López Torres, P. Lu, Jens Robert Luhder, M. Lunardon, Grazia Luparello, Yugang Ma, Alla Maevskaya, M. Mager, A. Maire, M. Makariev, Mikhail Malaev, G. Malfattore, N. M. Malik, Qasim Malik, Salman Khurshid Malik, Liudmila Malinina, Dmitry Mal Kevich, D. Mallick, Neelkamal Mallick, G. Mandaglio, Sushobhan Kumar Mandal, V. Manko, Franck Manso, V. Manzari, Yaxian Mao, G. V. Margagliotti, A. Margotti, Ana Maria Marin, C. Markert, Paolo Martinengo, Jacobb Lee Martinez, Mario Iván Martínez Hernández, G. Martınez García, Silvia Masciocchi, M. Masera, A. Masoni, L. Massacrier, Annalisa Mastroserio, O. Matonoha, P. F. T. Matuoka, A. Matyja, C. Mayer, Antonio Lafuente Mazuecos, F. Mazzaschi, M. Mazzilli, J. E. Mdhluli, Adrian Florin Mechler, Y. Melikyan, Arturo Alejandro Menchaca-Rocha, E. Meninno, A. S. Menon, Michal Meres, Sibaliso Mhlanga, Yasuo Miake, L. Micheletti, Lucrezia Camilla Migliorin, Dimitar Lubomirov Mihaylov, Konstantin Mikhaylov, A. N. Mishra, Dariusz Czeslaw Miskowiec, A. Modak, Auro Prasad Mohanty, B. Mohanty, M. Mohisin Khan, Mikael Andreas Molander, Z. Moravcova, C. Mordasini, Denise Aparecida Moreira de Godoy, I. Morozov, A. Morsch, Teo Mrnjavac, V. Muccifora, S. Muhuri, James Declan Mulligan, A. Mulliri, M. G. Munhoz, Robert Helmut Münzer, Hikari Murakami, S. Murray, L. Musa, Jan Musinsky, Julian Wojciech Myrcha, Bharati Naik, Anjali Ila Nambrath, Basanta Kumar Nandi, R. Nania, Eugenio Nappi, Adrian Fereydon Nassirpour, Abhishek Nath, C. Nattrass, Momchil Nikolaev Naydenov, Alexandra Neagu, Adrian-Eduard Negru, L. Nellen, Simon Voigt Nesbø, G. Neskovic, D. Nesterov, B. S. Nielsen, Emil Gorm Nielsen, Sergey Nikolaev, S. Nikulin, Vladimir Nikulin, F. Noferini, Seoyoung Noh, Petr Nomokonov, J. Norman, N. Novitzky, Piotr Nowakowski, A. Nyanin, Joakim Ingemar Nystrand, M. Ogino, A. Ohlson, Vitaly Okorokov, J. Oleniacz, Antonio Carlos Oliveira da Silva, M. H. Oliver, A. Önnerstad, C. Oppedisano, A. Ortiz Velasquez, Jacek Tomasz Otwinowski, Motomi Oya, Ken Oyama, Y. Pachmayer, Sonali Padhan, Davide Pagano, Guy Paić, Antonio Palasciano, S. Panebianco, H. Park, Hyebin Park, Jonghan Park, Jasper Elias Parkkila, Rajendra Nath Patra, B. Paul, Hua Pei, T. Peitzmann, X. Peng, M. Pennisi, Luis Gustavo Pereira, Dmitry Yurevich Peresunko, Guillermo Mesa Perez, S. Perrin, Yury Pestov, Vojtech Petracek, V. Petrov, M. Petrovici, R. P. Pezzi, Stefano Piano, M. Pikna, P. Pillot, O. Pinazza, Lawrence Pinsky, C. Pinto, S. Pisano, Mateusz Andrzej Ploskon, M. Planinić, Fabian Pliquett, Martin Poghosyan, Boris Polishchuk, S. Politano, N. Poljak, A. Pop, Sarah Julie Porteboeuf, Valeriy Pozdniakov, Irandheny Yoval Pozos, Kshitish Kumar Pradhan, Sidharth Kumar Prasad, Suraj Prasad, R. Preghenella, F. Prino, C. A. Pruneau, Igor Pshenichnov, Maximiliano Puccio, S. Pucillo, Zuzana Pugelova, Shi Qiu, Luca Quaglia, Raquel Estefania Quishpe Quishpe, Simone Ragoni, Andry Malala Rakotozafindrabe, L. Ramello, F. Rami, S. A. Rodríguez Ramírez, Thibaut Albert Rancien, M. Rasa, S. S. Räsänen, R. Rath, Max Philip Rauch, Ivan Ravasenga, K. F. Read, C. Reckziegel, A. Redelbach, K. Redlich, C. A. Reetz, Attiq Ur Rehman, F. Reidt, Haakon André Reme-Ness, Zuzana Jakubcinova, K. Reygers, Andrei Riabov, Viktor Riabov, R. Ricci, Matthias Rudolph Richter, Anton Albert Riedel, Werner Riegler, Catalin-Lucian Ristea, M. Rodríguez Cahuantzi, Ketil Roeed, Roman Rogalev, Elena Rogochaya, Tim Sebastian Rogoschinski, D. Røhr, Dieter Roehrich, P.F. Rojas, Solangel Rojas Torres, Przemyslaw Stefan Rokita, G. Romanenko, F. Ronchetti, A. Rosano, Edgar Dominguez Rosas, K. Rosłon, Andrea Rossi, Ankhi Roy, Subhadeep Roy, Nicola Rubini, Omar Vázquez Rueda, D. Ruggiano, R. Rui, Boris Rumyantsev, Pawel Grzegorz Russek, R. Russo, Anar Rustamov, Evgeny Ryabinkin, Y. F. Ryabov, A. Rybicki, H. Rytkönen, W. Rzesa, O. A. M. Saarimaki, Rita Sadek, Samrangy Sadhu, Sergey Sadovskiy, Jon-Are Saetre, K. Šafařı́k, S. K. Saha, S. Saha, B. Sahoo, Bhagyarathi Sahoo, R. Sahoo, Sarita Sahoo, Dushmanta Sahu, Pradip Kumar Sahu, Jogender Saini, Klaudia Tropp, Shingo Sakai, M. P. Salvan, S. Sambyal, I. Sanna, Thiago Badaro Saramela, Debojit Sarkar, Nachiketa Sarkar, P. Sarma, Valerio Sarritzu, V. M. Sarti, M. H. P. Sas, Johann Joachim Schambach, Horst Sebastian Scheid, C. Schiaua, R. Schicker, Alexander Schmah, C. Schmidt, Hans Rudolf Schmidt, M. Schmidt, M. P. Schmidt, Nicolas Schmidt, Austin Robert Schmier, Romain Schotter, Alexander Schroter, Jurgen Schukraft, K. Schwarz, K. Schweda, G. Scioli, Enrico Scomparin, Janet Elizabeth Seger, Y. Sekiguchi, Daiki Sekihata, I. Selyuzhenkov, S. Senyukov, Jin Joo Seo, Dmitry Serebryakov, Laura Serksnyte, A. Sevcenco, Tebogo Joyce Shaba, Alexandre Shabetai, Ruben Shahoyan, A. Shangaraev, A. Sharma, Binti Sharma, D. Sharma, H. Sharma, Meenakshi Sharma, Samarth Sharma, S. Sharma, Upasana Sharma, Afnan Shatat, Oveis Sheibani, Kenta Shigaki, Maya Hachiya Shimomura, Jaehyuck Shin, S. Shirinkin, Qiye Shou, Yury Sibiryak, Sabyasachi Siddhanta, Teodor Siemiarczuk, Tiago Fiorini da Silva, D. Silvermyr, Tawanchat Simantathammakul, R. Simeonov, Balwan Singh, Bhawani Singh, Ranbir Singh, Randhir Singh, R. Singh, Sweta Singh, Vivek Singh, V. Singhal, Tinku Sarkar - Sinha, Branislav Sitár, Mario Sitta, Bernhard Skaali, Georgijs Skorodumovs, Maciej Slupecki, Н. Н. Смирнов, R. J. M. Snellings, Emilie Haugland Solheim, J. Song, Arnon Songmoolnak, F. Soramel, Analyce Bella Soto-Hernandez, Rik Spijkers, Iwona Anna Sputowska, J. Staa, Johanna Stachel, Ionel Stan, Patrick John Steffanic, Stephan Friedrich Stiefelmaier, D. Stocco, I. Storehaug, Peter Stratmann, S. Strazzi, Christos Pliatskas Stylianidis, Alexandre Alarcon Do Passo Suaide, C. Suire, M. Sukhanov, M. Šuljić, Rishat Sultanov, Vikash Sumberia, Suharyo Sumowidagdo, Sagarika Swain, Imrich Szarka, Maciej Szymkowski, Seyed Farid Taghavi, G. Taillepied, J. Takahashi, Ganesh Jagannath Tambave, Siyu Tang, Zebo Tang, J. D. Tapia Takaki, Nicolae Ţăpuş, Lucia Anna Tarasovicova, Madalina-Gabriela Tarzila, G. F. Tassielli, Arturo Tauro, G. Tejeda Muñoz, Adriana Telesca, Livia Terlizzi, C. Terrevoli, S. Thakur, Deepa Thomas, Anatoly Tikhonov, A. R. Timmins, Milan Tkacik, Tomas Tkacik, A. Toia, Ryoka Tokumoto, Nataliya Topilskaya, Marco Toppi, Fernando Torales Acosta, T. Tork, Arianna Grisel Torres Ramos, Antonio Trifiro, Andrea Sofia Triolo, S. Tripathy, Tulika Tripathy, Stefano Trogolo, Victor Trubnikov, W. H. Trzaska, Tomasz Piotr Trzcinski, Alexandr Tumkin, Rosario Turrisi, T. S. Tveter, Kjetil Ullaland, B. Ulukutlu, A. Uras, M. Urioni, G. L. Usaı́, Martin Vala, Nicolo Valle, Lennart van Doremalen, M. van Leeuwen, C. A. van Veen, Roelof Jan Gijs van Weelden, P. Vande Vyvre, D. Varga, Z. Varga, Maria Vasileiou, Andrey Vasiliev, O. Vázquez Doce, V. Vechernin, E. Vercellin, Sergio Vergara Limon, L. Vermunt, Róbert Vértesi, M. Verweij, Linda Vickovic, Zabulon Vilakazi, O. Villalobos Baillie, Anna Villani, Gioacchino Vino, Alexander Vinogradov, T. Virgili, M. M. O. Virta, Vytautas Vislavicius, Alexander Vodopyanov, Benedikt Voelkel, Martin Andreas Volkl, K. Voloshin, Sergey Voloshin, Giacomo Volpe, Barthelemy von Haller, I. Vorobyev, N. Vozniuk, Janka Vrlakova, C. Wang, Dongfang Wang, Y. Wang, A. Wegrzynek, Felix Thomas Weiglhofer, Sandro Christian Wenzel, Johannes Peter Wessels, Sierra Lisa Weyhmiller, Jens Wiechula, Jon Wikne, Grzegorz Andrzej Wilk, J. Wilkinson, Guido Alexander Willems, B. Windelband, M. Winn, Josephina Rae Wright, Wenya Wu, Yitao Wu, Ran Xu, A. Yadav, Arun Kumar Yadav, Serpil Yalcin Kuzu, Yorito Yamaguchi, Shiming Yang, Satoshi Yano, Zhongbao Yin, I.-K. Yoo, J. H. Yoon, Shiming Yuan, Alperen Yuncu, V. Zaccolo, C. Zampolli, Federica Zanone, N. Zardoshti, A. Zarochentsev, Petr Zavada, Nikolay Zavyalov, Mikhail Zhalov, Biao Zhang, L. Zhang, S. Zhang, Xiaoming Zhang, Yifei Zhang, Z. Zhang, Mingrui Zhao, Vladimir Zherebchevskii, Zhi Yu, Daicui Zhou, Y. Zhou, Jianhui Zhu, Ya Zhu, Stefan Cristi Zugravel, Nicola Zurlo, ALICE Collaboration
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Le résumé fourni par la source
The first measurement of the polarisation of coherently photoproduced $J/ψ$ mesons in ultra-peripheral Pb–Pb collisions, using data at $\sqrt{s_{NN}}$ = 5.02 TeV, is presented. The $J/ψ$ meson is measured via its dimuon decay channel in the forward rapidity interval −4.0 < $y$ <−2.5 using the ALICE detector at the CERN LHC. An event sample corresponding to an integrated luminosity of 750 $μb^{−1}±$ 5% (syst) is analysed. Hadronic activity is highly suppressed since the interaction is mediated by a photon. The polar and azimuthal angle distributions of the decay muons are measured, and the polarisation parameters $λ_{θ}, λ_{φ}, λ_{θφ}$ are extracted. The analysis is carried out in the helicity frame. The results are found to be consistent with a transversely polarised $J/ψ$. These values are compared with previous measurements by the H1 and ZEUS experiments. The polarisation parameters of coherent $J/ψ$ photoproduction in Pb–Pb collisions are found to be consistent with the s-channel helicity conservation hypothesis.
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Les institutions déclarées
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