https://doi.org/10.1140/epjc/s10052-021-09437-6
Regular Article - Experimental Physics
Coherent
and
photoproduction at midrapidity in ultra-peripheral Pb–Pb collisions at
TeV
1
A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation, Yerevan, Armenia
2
AGH University of Science and Technology, Kraków, Poland
3
Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, Kiev, Ukraine
4
Department of Physics and Centre for Astroparticle Physics and Space Science (CAPSS), Bose Institute, Kolkata, India
5
Budker Institute for Nuclear Physics, Novosibirsk, Russia
6
California Polytechnic State University, San Luis Obispo, CA, USA
7
Central China Normal University, Wuhan, China
8
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Havana, Cuba
9
Centro de Investigación y de Estudios Avanzados (CINVESTAV), Mexico City and Mérida, Mexico
10
Chicago State University, Chicago, IL, USA
11
China Institute of Atomic Energy, Beijing, China
12
Chungbuk National University, Cheongju, Republic of Korea
13
Comenius University Bratislava, Faculty of Mathematics, Physics and Informatics, Bratislava, Slovakia
14
COMSATS University Islamabad, Islamabad, Pakistan
15
Creighton University, Omaha, NE, USA
16
Department of Physics, Aligarh Muslim University, Aligarh, India
17
Department of Physics, Pusan National University, Pusan, Republic of Korea
18
Department of Physics, Sejong University, Seoul, Republic of Korea
19
Department of Physics, University of California, Berkeley, CA, USA
20
Department of Physics, University of Oslo, Oslo, Norway
21
Department of Physics and Technology, University of Bergen, Bergen, Norway
22
Dipartimento di Fisica dell’Università ’La Sapienza’ and Sezione INFN, Rome, Italy
23
Dipartimento di Fisica dell’Università and Sezione INFN, Cagliari, Italy
24
Dipartimento di Fisica dell’Università and Sezione INFN, Trieste, Italy
25
Dipartimento di Fisica dell’Università and Sezione INFN, Turin, Italy
26
Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Bologna, Italy
27
Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Catania, Italy
28
Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Padova, Italy
29
Dipartimento di Fisica e Nucleare e Teorica, Università di Pavia and Sezione INFN, Pavia, Italy
30
Dipartimento di Fisica ‘E.R. Caianiello’ dell’Università and Gruppo Collegato INFN, Salerno, Italy
31
Dipartimento DISAT del Politecnico and Sezione INFN, Turin, Italy
32
Dipartimento di Scienze e Innovazione Tecnologica dell’Università del Piemonte Orientale and INFN Sezione di Torino, Alessandria, Italy
33
Dipartimento di Scienze MIFT, Università di Messina, Messina, Italy
34
Dipartimento Interateneo di Fisica ‘M. Merlin’ and Sezione INFN, Bari, Italy
35
European Organization for Nuclear Research (CERN), Geneva, Switzerland
36
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Split, Croatia
37
Faculty of Engineering and Science, Western Norway University of Applied Sciences, Bergen, Norway
38
Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic
39
Faculty of Science, P.J. Šafárik University, Košice, Slovakia
40
Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
41
Fudan University, Shanghai, China
42
Gangneung-Wonju National University, Gangneung, Republic of Korea
43
Department of Physics, Gauhati University, Guwahati, India
44
Helmholtz-Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany
45
Helsinki Institute of Physics (HIP), Helsinki, Finland
46
High Energy Physics Group, Universidad Autónoma de Puebla, Puebla, Mexico
47
Hiroshima University, Hiroshima, Japan
48
Hochschule Worms, Zentrum für Technologietransfer und Telekommunikation (ZTT), Worms, Germany
49
Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania
50
Indian Institute of Technology Bombay (IIT), Mumbai, India
51
Indian Institute of Technology Indore, Indore, India
52
Indonesian Institute of Sciences, Jakarta, Indonesia
53
INFN, Laboratori Nazionali di Frascati, Frascati, Italy
54
INFN, Sezione di Bari, Bari, Italy
55
INFN, Sezione di Bologna, Bologna, Italy
56
INFN, Sezione di Cagliari, Cagliari, Italy
57
INFN, Sezione di Catania, Catania, Italy
58
INFN, Sezione di Padova, Padua, Italy
59
INFN, Sezione di Roma, Rome, Italy
60
INFN, Sezione di Torino, Turin, Italy
61
INFN, Sezione di Trieste, Trieste, Italy
62
Inha University, Incheon, Republic of Korea
63
Institute for Gravitational and Subatomic Physics (GRASP), Utrecht University/Nikhef, Utrecht, The Netherlands
64
Institute for Nuclear Research, Academy of Sciences, Moscow, Russia
65
Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovakia
66
Institute of Physics, Homi Bhabha National Institute, Bhubaneswar, India
67
Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic
68
Institute of Space Science (ISS), Bucharest, Romania
69
Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
70
Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico City, Mexico
71
Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
72
Instituto de Física, Universidad Nacional Autónoma de México, Mexico City, Mexico
73
iThemba LABS, National Research Foundation, Somerset West, South Africa
74
Jeonbuk National University, Jeonju, Republic of Korea
75
Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik, Fachbereich Informatik und Mathematik, Frankfurt, Germany
76
Joint Institute for Nuclear Research (JINR), Dubna, Russia
77
Korea Institute of Science and Technology Information, Daejeon, Republic of Korea
78
KTO Karatay University, Konya, Turkey
79
Laboratoire de Physique des 2 Infinis, Irène Joliot-Curie, Orsay, France
80
Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS-IN2P3, Grenoble, France
81
Lawrence Berkeley National Laboratory, Berkeley, CA, USA
82
Division of Particle Physics, Department of Physics, Lund University, Lund, Sweden
83
Moscow Institute for Physics and Technology, Moscow, Russia
84
Nagasaki Institute of Applied Science, Nagasaki, Japan
85
Nara Women’s University (NWU), Nara, Japan
86
Department of Physics, School of Science, National and Kapodistrian University of Athens, Athens, Greece
87
National Centre for Nuclear Research, Warsaw, Poland
88
National Institute of Science Education and Research, Homi Bhabha National Institute, Jatni, India
89
National Nuclear Research Center, Baku, Azerbaijan
90
National Research Centre Kurchatov Institute, Moscow, Russia
91
Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
92
Nikhef, National Institute for Subatomic Physics, Amsterdam, The Netherlands
93
NRC Kurchatov Institute, IHEP, Protvino, Russia
94
NRC Kurchatov Institute, ITEP, Moscow, Russia
95
NRNU Moscow Engineering Physics Institute, Moscow, Russia
96
Nuclear Physics Group, STFC Daresbury Laboratory, Daresbury, UK
97
Nuclear Physics Institute of the Czech Academy of Sciences, Řež u Prahy, Czech Republic
98
Oak Ridge National Laboratory, Oak Ridge, TN, USA
99
Ohio State University, Columbus, OH, USA
100
Petersburg Nuclear Physics Institute, Gatchina, Russia
101
Physics Department, Faculty of science, University of Zagreb, Zagreb, Croatia
102
Physics Department, Panjab University, Chandigarh, India
103
Physics Department, University of Jammu, Jammu, India
104
Physics Department, University of Rajasthan, Jaipur, India
105
Physikalisches Institut, Eberhard-Karls-Universität Tübingen, Tübingen, Germany
106
Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
107
Physik Department, Technische Universität München, Munich, Germany
108
Politecnico di Bari and Sezione INFN, Bari, Italy
109
Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
110
Rudjer Bošković Institute, Zagreb, Croatia
111
Russian Federal Nuclear Center (VNIIEF), Sarov, Russia
112
Saha Institute of Nuclear Physics, Homi Bhabha National Institute, Kolkata, India
113
School of Physics and Astronomy, University of Birmingham, Birmingham, UK
114
Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Lima, Peru
115
St. Petersburg State University, St. Petersburg, Russia
116
Stefan Meyer Institut für Subatomare Physik (SMI), Vienna, Austria
117
SUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, Nantes, France
118
Suranaree University of Technology, Nakhon Ratchasima, Thailand
119
Technical University of Košice, Košice, Slovakia
120
The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland
121
The University of Texas at Austin, Austin, TX, USA
122
Universidad Autónoma de Sinaloa, Culiacán, Mexico
123
Universidade de São Paulo (USP), São Paulo, Brazil
124
Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil
125
Universidade Federal do ABC, Santo Andre, Brazil
126
University of Cape Town, Cape Town, South Africa
127
University of Houston, Houston, TX, USA
128
University of Jyväskylä, Jyväskylä, Finland
129
University of Liverpool, Liverpool, UK
130
University of Science and Technology of China, Hefei, China
131
University of South-Eastern Norway, Tonsberg, Norway
132
University of Tennessee, Knoxville, TN, USA
133
University of the Witwatersrand, Johannesburg, South Africa
134
University of Tokyo, Tokyo, Japan
135
University of Tsukuba, Tsukuba, Japan
136
Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
137
Université de Lyon, CNRS/IN2P3, Institut de Physique des 2 Infinis de Lyon, Lyon, France
138
Université de Strasbourg, CNRS, IPHC UMR 7178, 67000, Strasbourg, France
139
Départment de Physique Nucléaire (DPhN), Université Paris-Saclay Centre d’Etudes de Saclay (CEA), IRFU, Saclay, France
140
Università degli Studi di Foggia, Foggia, Italy
141
Università di Brescia and Sezione INFN, Brescia, Italy
142
Variable Energy Cyclotron Centre, Homi Bhabha National Institute, Kolkata, India
143
Warsaw University of Technology, Warsaw, Poland
144
Wayne State University, Detroit, MI, USA
145
Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany
146
Wigner Research Centre for Physics, Budapest, Hungary
147
Yale University, New Haven, CT, USA
148
Yonsei University, Seoul, Republic of Korea
149
Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Bologna, Italy
150
Dipartimento DET del Politecnico di Torino, Turin, Italy
151
M.V. Lomonosov Moscow State University, D.V. Skobeltsyn Institute of Nuclear Physics, Moscow, Russia
152
Institute of Theoretical Physics, University of Wroclaw, Wroclaw, Poland
153
CERN, 1211, Geneva 23, Switzerland
Received:
24
January
2021
Accepted:
9
July
2021
Published online:
9
August
2021
The coherent photoproduction of and
mesons was measured in ultra-peripheral Pb–Pb collisions at a center-of-mass energy
TeV with the ALICE detector. Charmonia are detected in the central rapidity region for events where the hadronic interactions are strongly suppressed. The
is reconstructed using the dilepton (
) and proton–antiproton decay channels, while for the
the dilepton and the
decay channels are studied. The analysis is based on an event sample corresponding to an integrated luminosity of about 233
. The results are compared with theoretical models for coherent
and
photoproduction. The coherent cross section is found to be in a good agreement with models incorporating moderate nuclear gluon shadowing of about 0.64 at a Bjorken-x of around
, such as the EPS09 parametrization, however none of the models is able to fully describe the rapidity dependence of the coherent
cross section including ALICE measurements at forward rapidity. The ratio of
to
coherent photoproduction cross sections was also measured and found to be consistent with the one for photoproduction off protons.
© The Author(s) 2021
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