Open Access
Open access
Journal of High Energy Physics, volume 2022, issue 7, publication number 117

Study of coherent J/ψ production in lead-lead collisions at $$ \sqrt{{\mathrm{s}}_{\mathrm{NN}}} $$ = 5 TeV

R. Aaij 1
C. Abellan Beteta 2
T. Ackernley 3
B. Adeva 4
M. Adinolfi 5
H. Afsharnia 6
C. A. Aidala 7
S. Aiola 5
Z. Ajaltouni 8
S. Akar 9
J Albrecht 10
F. Alessio 11
M ALEXANDER 12
A. Alfonso Albero 13
Z. Aliouche 14
G. Alkhazov 15
P. Alvarez Cartelle 16
S Amato 17
Y. Amhis 10
L. An 18
L. Anderlini 14
A. Andreianov 19
M. Andreotti 20
F. ARCHILLI 21
A. Artamonov 22
M. Artuso 23
K. Arzymatov 24
E Aslanides 1
M Atzeni 25
B. Audurier 20
S Bachmann 26
M. Bachmayer 27
J.J. Back 3
P. Baladron Rodriguez 25
V. Balagura 19
W. Baldini 28
J. Baptista Leite 13
R. J. BARLOW 17
S. Barsuk 29
W. Barter 30
M. Bartolini 31
F. Baryshnikov 32
J. M. Basels 33
G. Bassi 22
B. Batsukh 9
A. Battig 26
A. Bay 9
M Becker 33
F. Bedeschi 28
I. BEDIAGA 22
A. Beiter 23
V. Belavin 34
S Belin 26
V. Bellee 21
K. Belous 35
I. Belov 36
I. Belyaev 37
G. BENCIVENNI 38
E. Ben-Haim 35
A. Berezhnoy 1
R. Bernet 20
D. Berninghoff 22
H. C. Bernstein 10
C. Bertella 39
A. Bertolin 1
C. BETANCOURT 10
F. Betti 1
Ia. Bezshyiko 4
S Bhasin 40
J. Bhom 41
L. Bian 9
M. S. Bieker 42
S. Bifani 38
P. Billoir 29
M. Birch 15
F. C. R. Bishop 13
A. Bitadze 18, 43
A. Bizzeti 44
M. Bjørn 10
M. P. Blago 27
T. Blake 26
F. Blanc 22
S. Blusk 11
D. Bobulska 9
J. A. Boelhauve 3
T. Boettcher 45
A. Boldyrev 46
A. Bondar 10, 14
N. Bondar 13
S. Borghi 23
M. Borisyak 20
M. Borsato 40
J. T. Borsuk 26
S. A. Bouchiba 2
T.J.V. Bowcock 10
A. Boyer 19
C Bozzi 29
M.J. Bradley 47
S Braun 3
A. Brea Rodriguez 10
M. Brodski 40
J. Brodzicka 27
A. Brossa Gonzalo 34
D. Brundu 1
A. Buonaura 10
C. Burr 48
A. Bursche 49
A. BUTKEVICH 50
J. S. Butter 10
J BUYTAERT 10
W. Byczynski 34
S Cadeddu 41
H. Cai 19, 51
R. Calabrese 9, 38
L. Calefice 37
L. Calero Diaz 37
S. Cali 42
R. Calladine 52, 53
M. Calvi 54
M. Calvo Gomez 4
P. Camargo Magalhaes 12, 54
A Camboni 37
P. Campana 55
A. F. Campoverde Quezada 52, 53
S. Capelli 56, 57
L. Capriotti 56, 57
G. Carboni 30
R Cardinale 34
A. Cardini 59
I. Carli 52, 53
P. Carniti 32
L. Carus 50
K. Carvalho Akiba 3
A. Casais Vidal 2
G Casse 10
M. Cattaneo 10
G. Cavallero 26
S. Celani 24
J. Cerasoli 2
A J CHADWICK 4
M. G. Chapman 38
M. Charles 10
Ph. Charpentier 42
G. Chatzikonstantinidis 2
C. A. Chavez Barajas 60
M. Chefdeville 61
C. Chen 59
S. Chen 40
A. Chernov 3
V. Chobanova 26
S. Cholak 40
M. Chrzaszcz 14
A. Chubykin 14
V. Chulikov 37
P. CIAMBRONE 27
M. F. Cicala 3
X. Cid Vidal 10
G. Ciezarek 62
P. E. L. CLARKE 10
M. Clemencic 15
H V Cliff 10
J. Closier 13
J. L. Cobbledick 10
V. Coco 17
J. A. B. Coelho 24
J Cogan 5
E. Cogneras 63
L. Cojocariu 10
P. Collins 10
T Colombo 64, 65
L. Congedo 34
A Contu 42
N COOKE 11
G. Coombs 10
G. Corti 27
C. M. Costa Sobral 10
B. Couturier 66
D. C. Craik 67
J. Crkovská 28
M. Cruz Torres 62
R Currie 67
C. L. Da Silva 9
E. Dall’Occo 3
J. Dalseno 10
C. d'Ambrosio 36
A. Danilina 10
P. Dargent 13
A. Davis 13
O. De Aguiar Francisco 68
K. de Bruyn 13
S. de Capua 26
M. De Cian 28
J. M. DE MIRANDA 16
L. de Paula 64, 65
M. De Serio 1
D. De Simone 37
P. De Simone 69
J. A. DE VRIES 67
C. T. Dean 60
D. Decamp 38
L. Del Buono 15
B. Delaney 9
H.P. Dembinski 70
A. Dendek 1
V. Denysenko 45
D Derkach 5
O. Deschamps 17
F. Desse 34, 71
F. Dettori 72
B. DEY 37
P. Di Nezza 31
S. Didenko 3
L. Dieste Maronas 10
H. Dijkstra 73
V. Dobishuk 74
A. M. Donohoe 34
F. Dordei 28
A.C. dos Reis 11
L. DOUGLAS 75
A. Dovbnya 60
A. G. Downes 2
K. Dreimanis 40
M. W. Dudek 10
L. Dufour 76
V. Duk 10
P. Durante 67
J. M. Durham 13
D. Dutta 40
A. Dziurda 14
A. Dzyuba 77
S Easo 78
U Egede 36
V. Egorychev 46, 79
S Eidelman 62
S. EISENHARDT 26
S. Ek-In 11, 80
L. Eklund 22
S. Ely 63
A. Ene 67
E. Epple 32
S. Escher 1
J. Eschle 38
S Esen 10
T. Evans 56
A. Falabella 61
J. Fan 55
Y. Fan 41
B. Fang 2
S. Farry 52, 53
D. Fazzini 10
M. Féo 3
A. Fernandez Prieto 12
J. M. Fernandez-tenllado Arribas 47
A. D. Fernez 56, 57
F. FERRARI 26
L. Ferreira Lopes 16
F. Ferreira Rodrigues 50
S. Ferreres Sole 1
M. Ferrillo 10
M. Ferro-Luzzi 49
S. Filippov 64
R.A Fini 19, 51
M. Fiorini 70
M. Firlej 44
K. M. Fischer 6
D. S. Fitzgerald 13
C. Fitzpatrick 70
T. Fiutowski 25
F. Fleuret 38
M Fontana 30, 81
F. Fontanelli 10
R. Forty 2
V. Franco Lima 47
M. Franco Sevilla 10
M Frank 19
E. Franzoso 20
G. Frau 10
C FREI 11
D. A. Friday 7
J Fu 9
Q. Fuehring 10
W. Funk 50
E Gabriel 23
T. Gaintseva 3
A. Gallas Torreira 56, 57
D. Galli 10, 62
S. Gambetta 61
Y. Gan 16
M. Gandelman 7
P. Gandini 82
Y. Gao 34
M. Garau 27
L. M. Garcia Martin 12
P. Garcia Moreno 52, 53
J. García Pardiñas 3
B. Garcia Plana 25
F. A. Garcia Rosales 12
L Garrido 10
C. Gaspar 50
R. E. Geertsema 20
D. Gerick 9
L. L. Gerken 13
E. Gersabeck 13
M. Gersabeck 27
T. Gershon 24
D. Gerstel 60
Ph. Ghez 15
V. Gibson 83
H. K. Giemza 37, 84
M Giovannetti 3
A. Gioventù 12
P. Gironella Gironell 63
L. Giubega 10, 19, 51
C. Giugliano 62
K. Gizdov 10
E. L. Gkougkousis 38
V. V. Gligorov 85
C Göbel 54
E. GOLOBARDES 36
D. Golubkov 29, 31
A. Golutvin 28, 86
A Gomes 12
S. Gomez Fernandez 44
F. Goncalves Abrantes 40
M. Goncerz 61
G. Gong 36
P. Gorbounov 35
I. V. Gorelov 52
C. GOTTI 10
E. Govorkova 20
J. P. Grabowski 38
T. Grammatico 10
L. A. Granado Cardoso 12
E. Graugès 26
E. Graverini 18
G GRAZIANI 63
A. Grecu 50
L. M. Greeven 19, 51
P GRIFFITH 13
L. Grillo 31
S. Gromov 44
B. R. Gruberg Cazon 61
C. Gu 19
M. Guarise 20
P. A. Günther 49
E. Gushchin 32
A. Güth 21
Y. Guz 10
T. Gys 78
T. Hadavizadeh 26
G HAEFELI 10
C. Haen 10
J. Haimberger 2
T. Halewood-leagas 47
P M Hamilton 2
J. P. Hammerich 87
Q. Han 20
X. Han 44
T. H. Hancock 20
S. Hansmann-Menzemer 44
N. Harnew 2
T. Harrison 10
C. Hasse 10
M. Hatch 55, 88
J. He 29
M Hecker 50
K. Heijhoff 9
K. Heinicke 10
A. M. Hennequin 2
K. Hennessy 7, 89
L Henry 32
J. Heuel 16
A. Hicheur 26
D. Hill 13
M. Hilton 9
S. E. Hollitt 20
J. Hu 87
W. Hu 55
W. Huang 41
X. Huang 50
W. Hulsbergen 27
R. J. HUNTER 45
M. Hushchyn 2
D. Hutchcroft 50
D. Hynds 9
P. Ibis 70
M. Idzik 14
D. Ilin 8
P. Ilten 14
A. Inglessi 31
A. Ishteev 14
K. Ivshin 10
R. Jacobsson 10
S. Jakobsen 50
E. Jans 89
B. K. Jashal 47
A. JAWAHERY 9
V. Jevtic 40
M. Jezabek 61
F. Jiang 44
M. John 10
D JOHNSON 15
C R JONES 27
T P Jones 10
B Jost 10
N. Jurik 75
S. Kandybei 61
Y. Kang 10
M. Karacson 45
M. Karpov 10
F. Keizer 27
M. Kenzie 90
T. Ketel 9
B. Khanji 91
A. Kharisova 21
S. Kholodenko 32
T. Kirn 26
V. S. Kirsebom 66
O. Kitouni 50
S. Klaver 83
K. Klimaszewski 73
S. Koliiev 31
A. Kondybayeva 36
A. Konoplyannikov 70
P. Kopciewicz 20
R. Kopecna 50
P. Koppenburg 35
M. Korolev 50, 73
I. Kostiuk 73
O. Kot 14, 19
S. Kotriakhova 14
P. Kravchenko 49
L. Kravchuk 10
R. D. Krawczyk 27
M. Kreps 29
F. Kress 32
S. Kretzschmar 46, 79
P. Krokovny 70
W. Krupa 83
W. Krzemien 40, 92
W. Kucewicz 40
M. Kucharczyk 46, 79
V. Kudryavtsev 50, 90
H. S. Kuindersma 67
G. J. Kunde 36
T. Kvaratskheliya 10
D. Lacarrere 13
G. Lafferty 34
A. Lai 34
A. Lampis 1
D. Lancierini 13
J. J. Lane 4
R LANE 37
G. Lanfranchi 32
C. Langenbruch 9
J. Langer 1
O. Lantwin 27
LATHAM T. 33, 93
F Lazzari 24
R. Le Gac 6
S. H. Lee 5
R. LEFÈVRE 35
A. Leflat 31
S. Legotin 24
O. Leroy 40
T. Lesiak 20
B. Leverington 48
H Li 44
L Li 20
P. Li 87
S. Li 59
Y Li 22
Z Li 22
X. Liang 29
T. Lin 10
R Lindner 9
V. Lisovskyi 34
R. Litvinov 48
G. Liu 55
H Liu 59
S. Liu 61
Xin Liu 34
A. Loi 3
J. Lomba Castro 11
I. Longstaff 16
J.H. Lopes 15
G.H. Lovell 48
Q. Lu 59
Y Lü 39, 94
D. Lucchesi 49
S. Luchuk 50
M. Lucio Martinez 50, 73
V. Lukashenko 61
Y. Luo 13
A. Lupato 19, 51
E Luppi 27
O. Lupton 33, 95
A Lusiani 55
X. Lyu 59
L. Ma 55
R MA 56, 57
S. Maccolini 17
F. Machefert 63
F. Maciuc 26
V. Macko 9
P. Mackowiak 4
S. Maddrell-Mander 70
O. Madejczyk 4
L. R. Madhan Mohan 14
O. Maev 45
A. Maevskiy 14
D. Maisuzenko 70
M. W. Majewski 40
J. J. Malczewski 44
S. Malde 10
B. Malecki 96
A. Malinin 46, 79
T. Maltsev 20
H. Malygina 34, 71
G. Manca 24
G. MANCINELLI 56, 57
D. Manuzzi 7, 97
D. Marangotto 5, 98
J. Maratas 60
J. F. Marchand 56
U. Marconi 18, 99
S. MARIANI 10
C. Marin Benito 26
M. Marinangeli 20
J. Marks 4
A.M. MARSHALL 2
P.J. Marshall 100
G. Martellotti 10, 53
L. Martinazzoli 52, 53
M Martinelli 3
D. Martinez Santos 89
F. Martinez-Vidal 28
A. Massafferri 32
M. Materok 10
R. Matev 1
A. Mathad 10
Z. Mathe 36
V. Matiunin 52
C Matteuzzi 6
K. R. Mattioli 50
A. Mauri 25
E. Maurice 12
J. Mauricio 10
M. Mazurek 29
M McCann 74
L McConnell 13
T. H. Mcgrath 13
A. McNab 74
R. McNulty 2
J. V. Mead 8
B. Meadows 24
C. Meaux 9
G Meier 101
N. Meinert 83
D. Melnychuk 52, 53
S. Meloni 50, 69
M. Merk 7
A Merli 16
L. Meyer Garcia 10
M. Mikhasenko 102
D. A. Milanes 27
E. Millard 10
M Milovanovic 60
M.-N. Minard 19
A. Minotti 19, 51
L. Minzoni 62
S E MITCHELL 13
B. Mitreska 10
D. S. Mitzel 9
A. Mödden 44
R.A. Mohammed 29
R. D. Moise 9
T. Mombächer 102
I. A. Monroy 5
S. Monteil 39
M. Morandin 37
G. Morello 33, 95
M. J. Morello 70
J. Moron 103
A. B. Morris 27
A G Morris 22
R. Mountain 61
H Mu 10, 62
F Muheim 10
M. Mulder 10
D Müller 1
K. Müller 44
C. H. Murphy 13
D. Murray 10, 34
P. MUZZETTO 4
P. Naik 26
T Nakada 77
R Nandakumar 26
T. Nanut 16
I. Nasteva 62
M. Needham 19
I. Neri 7, 97
N. Neri 103
S. Neubert 10
N Neufeld 29
R. Newcombe 26
T. D. Nguyen 26, 104
C. Nguyen-Mau 17
E. M. Niel 32
S. Nieswand 35
N. Nikitin 9
N. S. Nolte 6
C Núñez 70
A. Oblakowska-Mucha 21
V. Obraztsov 4
D. P. O’Hanlon 34, 71
R. Oldeman 22
M. E. Olivares 68
C. J. G. ONDERWATER 40
A. Ossowska 16
J. M. Otalora Goicochea 36
T. Ovsiannikova 1
P Owen 89
A. Oyanguren 27
B. Pagare 10
P. R. Pais 44
T. Pajero 64
A. Palano 37
M. PALUTAN 13
Y Pan 91
G. Panshin 77
A Papanestis 64, 65
M. Pappagallo 19, 51
L.L. Pappalardo 8
C. Pappenheimer 47
W. Parker 13
C Parkes 3
C. J. Parkinson 19
B. Passalacqua 18
G. Passaleva 64
A. Pastore 29
M. Patel 56, 57
C. Patrignani 69
C. J. Pawley 10
A PEARCE 50
A Pellegrino 10
M. Pepe-Altarelli 56
S. Perazzini 36
D. Pereima 5
P. Perret 10, 11
M. Petrič 4
K. Petridis 30, 81
A. Petrolini 96
A. Petrov 62
S. Petrucci 7
M. Petruzzo 22
T. T. H. Pham 23
A. Philippov 33, 95
L. Pica 76
M. Piccini 60
B. Pietrzyk 26
G Pietrzyk 44
M. Pili 100
D. Pinci 10
F. Pisani 24
P. K. Resmi 63
V. Placinta 42
J. Plews 3
M. Plo Casasus 38
F. Polci 37
M. Poli-Lener 22
M. Poliakova 24
A. Poluektov 31, 105
N POLUKHINA 22
I. Polyakov 16
E. Polycarpo 4
G.J. POMERY 10
S Ponce 10, 55
D. Popov 23
S. Popov 21
S. Poslavskii 40
K. PRASANTH 10
L. Promberger 3
C. Prouve 73
V. Pugatch 44
H. Pullen 33, 106
G. Punzi 55
W. Qian 55
J. Qin 38
R. Quagliani 60
B. QUINTANA 74
N. V. Raab 24
R. I. Rabadan-Trejo 70
B. Rachwal 4
J. H. Rademacker 33
M. Rama 27
M. Ramos Pernas 16
M. S. Rangel 23, 45
F. Ratnikov 90
G. Raven 60
M. Reboud 26
F. Redi 13
F Reiss 89
C. Remon Alepuz 61
Z. Ren 44
V. Renaudin 33
R. Ribatti 77
S. Ricciardi 2
K. Rinnert 17
P. Robbe 62
G ROBERTSON 26
A.B. Rodrigues 2
E. RODRIGUES 102
J. A. Rodriguez Lopez 44
A. Rollings 10
P. Roloff 21
V. Romanovskiy 3
M. Romero Lamas 3
A. Romero Vidal 6
J.D. Roth 37
M. ROTONDO 22
M. S. Rudolph 10
T Ruf 89
J. Ruiz Vidal 45
A. Ryzhikov 70
J. Ryzka 3
J. J. Saborido Silva 14
N. Sagidova 27
N. Sahoo 34, 71
B. Saitta 10
M. Salomoni 12
D. Sanchez Gonzalo 50
C. Sanchez Gras 100
R. Santacesaria 3
C. Santamarina Rios 37
M. Santimaria 58, 84
E. Santovetti 31
D. Saranin 13
G. Sarpis 103
M. Sarpis 100
A. Sarti 100, 107
C. Satriano 58
A. Satta 9
M. Saur 35, 36
D. Savrina 5
H. Sazak 44
L. G. Scantlebury Smead 32
S. Schael 9
M. Schellenberg 11
M. SCHILLER 10
H. Schindler 108
M. SCHMELLING 10
B. Schmidt 26
O. Schneider 10
A. Schopper 50
M. Schubiger 26
S. Schulte 17
M.H. Schune 10
R. Schwemmer 37
B. SCIASCIA 3
S. Sellam 36
A. Semennikov 90
M. Senghi Soares 30
A Sergi 1
N Serra 39
L. Sestini 9
A. Seuthe 10
P. Seyfert 82
Y. Shang 6
D. M. Shangase 21
M. Shapkin 31
I. Shchemerov 26
L. Shchutska 2
T. Shears 46, 79
L SHEKHTMAN 82
Z. Shen 96
V. Shevchenko 52, 53
E. B. Shields 31
E. Shmanin 22
J. D. Shupperd 19
B. G. Siddi 1
R. Silva Coutinho 39
G. Simi 64, 65
S. Simone 13
N. Skidmore 22
T. SKWARNICKI 42
M.W. Slater 19, 51
I. Slazyk 44
J C SMALLWOOD 15
J. G. Smeaton 36
A. Smetkina 1
E Smith 29
M. Smith 50
A. Snoch 56
M Soares 5
L. Soares Lavra 8
M. D. SOKOLOFF 11
F. J. P. Soler 14
A. Solovev 14
I. Solovyev 16
F. L. Souza De Almeida 16
B. Souza De Paula 9
B. Spaan 7, 97
E. Spadaro Norella 11
P. Spradlin 10
F. Stagni 8
M Stahl 10
S Stahl 26
P. STEFKO 1, 31
O STEINKAMP 21
O. Stenyakin 9
H. Stevens 22
S. Stone 26
M. E. Stramaglia 63
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D. Strekalina 44
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J Sun 41
L. Sun 47
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P. N. Swallow 70
K. Swientek 83
A. Szabelski 70
T. Szumlak 10
M Szymanski 13
S. Taneja 10
F. Teubert 10
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K. A. Thomson 5
V. Tisserand 60
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M. Tobin 19, 51
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A Venkateswaran 50
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M. Vesterinen 8
D Vieira 26
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M Wang 4
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Z Wang 2
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D Websdale 66
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I WILLIAMS 66
M. R. J. Williams 77
F.F. Wilson 83
W. Wiślicki 40
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L. Witola 17
G. Wormser 15
S.A. Wotton 22
H. Wu 10
K. Wyllie 55
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D. XIAO 87
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A. Xu 55
J Xu 61
L. Xu 87
M. Xu 55
Q. Xu 82
Z. XU 61
Dewei Yang 55
S Yang 55
Y. Yang 61
Z. Yang 22
Y. Yao 2
L. E. Yeomans 87
H. Yin 110
J. Yu 22
X. Yuan 21
O. Yushchenko 26
E. Zaffaroni 105, 108
M. Zavertyaev 40
M. Zdybal 10
O. Zenaiev 61
M. Zeng 87
D Zhang 61
L. Zhang 82
S Zhang 82
Y Zhang 20
A. Zhelezov 55
Y. Zheng 55
X. Zhou 55
Y. Zhou 61
X. Zhu 55
Z. Zhu 32, 35
V. Zhukov 62
J. B. Zonneveld 59
Q. Zou 56, 57
S. Zucchelli 39
D. Zuliani 13
Show full list: 948 authors
23
 
Yandex School of Data Analysis, Moscow, Russia
25
 
Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
28
 
Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
60
 
Univ. Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France
63
 
Horia Hulubei national Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
73
 
Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
75
 
NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
85
 
Pontifícia Universidade Católica do Rio de Janeiro (PUC-RIO), Rio de Janeiro, Brazil
86
 
Universidade Federal do Triângulo Mineiro (UFTM), Uberaba, Brazil
88
 
Hangzhou Institute for Advanced Study, UCAS, Hangzhou, China
102
 
Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia
Publication typeJournal Article
Publication date2022-07-23
scimago Q2
wos Q1
SJR0.832
CiteScore10.0
Impact factor5
ISSN10298479, 11266708
Nuclear and High Energy Physics
Abstract
Coherent production of J/ψ mesons is studied in ultraperipheral lead-lead collisions at a nucleon-nucleon centre-of-mass energy of 5 TeV, using a data sample collected by the LHCb experiment corresponding to an integrated luminosity of about 10 μb−1. The J/ψ mesons are reconstructed in the dimuon final state and are required to have transverse momentum below 1 GeV. The cross-section within the rapidity range of 2.0 < y < 4.5 is measured to be 4.45 ± 0.24 ± 0.18 ± 0.58 mb, where the first uncertainty is statistical, the second systematic and the third originates from the luminosity determination. The cross-section is also measured in J/ψ rapidity intervals. The results are compared to predictions from phenomenological models.
Harland-Lang L.A., Tasevsky M., Khoze V.A., Ryskin M.G.
European Physical Journal C scimago Q1 wos Q2 Open Access
2020-10-07 citations by CoLab: 49 PDF Abstract  
We present the results of the new SuperChic 4 Monte Carlo implementation of photon-initiated production in proton–proton collisions, considering as a first example the case of lepton pair production. This is based on the structure function calculation of the underlying process, and focusses on a complete account of the various contributing channels, including the case where a rapidity gap veto is imposed. We provide a careful treatment of the contributions where either (single dissociation), both (double dissociation) or neither (elastic) proton interacts inelastically and dissociates, and interface our results to Pythia for showering and hadronization. The particle decay distribution from dissociation system, as well the survival probability for no additional proton–proton interactions, are both fully accounted for; these are essential for comparing to data where a rapidity gap veto is applied. We present detailed results for the impact of the veto requirement on the differential cross section, compare to and find good agreement with ATLAS 7 TeV data on semi-exclusive production, and provide a new precise evaluation of the background from semi-exclusive lepton pair production to SUSY particle production in compressed mass scenarios, which is found to be low.
Flett C. ., Jones S. ., Martin A. ., Ryskin M. ., Teubner T.
Physical Review D scimago Q1 wos Q1
2020-05-13 citations by CoLab: 26 Abstract  
We compare the cross section for exclusive $J/\psi$ photoproduction calculated at NLO in the collinear factorization approach with HERA and LHCb data. Using the optimum scale formalism together with the subtraction of the low $k_t
Harland-Lang L.A., Martin A.D., Nathvani R., Thorne R.S.
European Physical Journal C scimago Q1 wos Q2 Open Access
2019-10-01 citations by CoLab: 46 PDF Abstract  
We present the MMHT2015qed PDF set, resulting from the inclusion of QED corrections to the existing set of MMHT Parton Distribution Functions (PDFs), and which contain the photon PDF of the proton. Adopting an input distribution from the LUXqed formulation, we discuss our methods of including QED effects for the full, coupled DGLAP evolution of all partons with QED at $${\mathcal {O}}(\alpha )$$, $${\mathcal {O}}(\alpha \alpha _{S})$$, $${\mathcal {O}}(\alpha ^2)$$. While we find consistency for the photon PDF of the proton with other recent sets, building on this we also present a set of QED corrected neutron PDFs and provide the photon PDF separated into its elastic and inelastic contributions. The effect of QED corrections on the other partons and the fit quality is investigated, and the sources of uncertainty for the photon are outlined. Finally we explore the phenomenological implications of this set, giving the partonic luminosities for both the elastic and inelastic contributions to the photon and the effect of our photon PDF on fits to high mass Drell–Yan production, including the photon-initiated channel.
Flett C., Jones S., Martin A., Ryskin M.G., Teubner T.
2019-07-03 citations by CoLab: 2 Abstract  
We discuss how the stability of the theoretical prediction for exclusive $J/\psi$ photoproduction has been improved through a systematic taming of the known $\overline{\text{MS}}$ coefficient functions by accounting for a formally power suppressed, but numerically significant, correction encoded within a $Q_0$ cut. The phenomenological implications of this will be emphasised meaning, ultimately, the possibility to include the exclusive data into a global fitter framework to provide constraints on the small $x$ gluon.
Akiba K.C., Alessio F., Bondar N., Byczynski W., Coco V., Collins P., Dumps R., Dzhelyadin R., Gandini P., Cazon B.R., Jacobsson R., Johnson D., Manthey J., Mauricio J., McNulty R., et. al.
Journal of Instrumentation scimago Q2 wos Q3
2018-04-12 citations by CoLab: 24 Abstract  
The HERSCHEL detector consists of a set of scintillating counters, designed to increase the coverage of the LHCb experiment in the high-rapidity regions on either side of the main spectrometer. The new detector improves the capabilities of LHCb for studies of diffractive interactions, most notably Central Exclusive Production. In this paper the construction, installation, commissioning, and performance of HERSCHEL are presented.
Cepila J., Contreras J.G., Krelina M.
Physical Review C scimago Q1 wos Q2
2018-02-06 citations by CoLab: 69 Abstract  
In a previous publication, we have presented a model for the photoproduction of $\mathrm{J/}\psi$ vector mesons off protons, where the proton structure in the impact-parameter plane is described by an energy-dependent hot-spot profile. Here we extend this model to study the photonuclear production of $\mathrm{J/}\psi$ vector mesons in coherent and incoherent interactions of heavy nuclei. We study two methods to extend the model to the nuclear case: using the standard Glauber-Gribov formalism and using geometric scaling to obtain the nuclear saturation scale. We find that the incoherent cross section changes sizably with the inclusion of subnucleonic hot spots, and that this change is energy dependent. We propose to search for this behavior by measuring the ratio of the incoherent to coherent cross section at different energies. We compare the results of our model to results from RHIC and from the Run 1 at the LHC finding a satisfactory agreement. We also present predictions for the LHC at the new energies reached in Run 2. The predictions include $\mathrm{J/}\psi$ production in ultra-peripheral collisions, as well as the recently observed photonuclear production in peripheral collisions.
Mäntysaari H., Schenke B.
2017-09-01 citations by CoLab: 65 Abstract  
We show that introducing subnucleon scale fluctuations constrained by HERA diffractive $J/\Psi$ production data significantly affects the incoherent diffractive $J/\Psi$ production cross section in ultraperipheral heavy ion collisions. We find that the inclusion of the additional fluctuations increases the ratio of the incoherent to the coherent cross section approximately by a factor of $2$, and modifies the transverse momentum spectra of the produced $J/\Psi$ at momenta larger than the scale that corresponds to the distance scale of the subnucleonic fluctuations. We present predictions for $J/\Psi$ production in ultraperipheral heavy ion collisions at $\sqrt{s_{NN}}=5.02\,{\rm TeV}$ at the LHC and $200\,{\rm GeV}$ at RHIC.
Eskola K.J., Paakkinen P., Paukkunen H., Salgado C.A.
European Physical Journal C scimago Q1 wos Q2 Open Access
2017-03-16 citations by CoLab: 400 PDF Abstract  
We introduce a global analysis of collinearly factorized nuclear parton distribution functions (PDFs) including, for the first time, data constraints from LHC proton–lead collisions. In comparison to our previous analysis, EPS09, where data only from charged-lepton–nucleus deep inelastic scattering (DIS), Drell–Yan (DY) dilepton production in proton–nucleus collisions and inclusive pion production in deuteron–nucleus collisions were the input, we now increase the variety of data constraints to cover also neutrino–nucleus DIS and low-mass DY production in pion–nucleus collisions. The new LHC data significantly extend the kinematic reach of the data constraints. We now allow much more freedom for the flavor dependence of nuclear effects than in other currently available analyses. As a result, especially the uncertainty estimates are more objective flavor by flavor. The neutrino DIS plays a pivotal role in obtaining a mutually consistent behavior for both up and down valence quarks, and the LHC dijet data clearly constrain gluons at large momentum fraction. Mainly for insufficient statistics, the pion–nucleus DY and heavy-gauge-boson production in proton–lead collisions impose less visible constraints. The outcome – a new set of next-to-leading order nuclear PDFs called EPPS16 – is made available for applications in high-energy nuclear collisions.
Klein S.R., Nystrand J., Seger J., Gorbunov Y., Butterworth J.
Computer Physics Communications scimago Q1 wos Q1
2017-03-01 citations by CoLab: 217 Abstract  
Ultra-peripheral collisions (UPCs) have been a significant source of study at RHIC and the LHC. In these collisions, the two colliding nuclei interact electromagnetically, via two-photon or photonuclear interactions, but not hadronically; they effectively miss each other. Photonuclear interactions produce vector meson states or more general photonuclear final states, while two-photon interactions can produce lepton or meson pairs, or single mesons. In these interactions, the collision geometry plays a major role. We present a program, STARlight, that calculates the cross-sections for a variety of UPC final states and also creates, via Monte Carlo simulation, events for use in determining detector efficiency.
Guzey V., Kryshen E., Zhalov M.
Physical Review C scimago Q1 wos Q2
2016-05-24 citations by CoLab: 47 Abstract  
We make predictions for the cross sections of coherent photoproduction of $\rho$, $\phi$, $J/\psi$, $\psi(2S)$, and $\Upsilon(1S)$ mesons in Pb-Pb ultraperipheral collisions (UPCs) at $\sqrt{s_{NN}}=5.02$ TeV in the kinematics of run 2 at the Large Hadron Collider extending the approaches successfully describing the available Pb-Pb UPC data at $\sqrt{s_{NN}}=2.76$ TeV. Our results illustrate the important roles of hadronic fluctuations of the photon and inelastic nuclear shadowing in photoproduction of light vector mesons on nuclei and the large leading twist nuclear gluon shadowing in photoproduction of quarkonia on nuclei. We show that the ratio of $\psi(2S)$ and $J/\psi$ photoproduction cross sections in Pb-Pb UPCs is largely determined by the ratio of these cross sections on the proton. We also argue that UPCs with electromagnetic excitations of the colliding ions followed by the forward neutron emission allows one to significantly increase the range of photon energies accessed in vector meson photoproduction on nuclei.
Kovařík K., Kusina A., Ježo T., Clark D. ., Keppel C., Lyonnet F., Morfín J. ., Olness F. ., Owens J. ., Schienbein I., Yu J. .
Physical Review D scimago Q1 wos Q1
2016-04-28 citations by CoLab: 335 Abstract  
We present the new nCTEQ15 set of nuclear parton distribution functions with uncertainties. This fit extends the CTEQ proton PDFs to include the nuclear dependence using data on nuclei all the way up to 208^Pb. The uncertainties are determined using the Hessian method with an optimal rescaling of the eigenvectors to accurately represent the uncertainties for the chosen tolerance criteria. In addition to the Deep Inelastic Scattering (DIS) and Drell-Yan (DY) processes, we also include inclusive pion production data from RHIC to help constrain the nuclear gluon PDF. Furthermore, we investigate the correlation of the data sets with specific nPDF flavor components, and asses the impact of individual experiments. We also provide comparisons of the nCTEQ15 set with recent fits from other groups.
2015-03-05 citations by CoLab: 658 Abstract  
The LHCb detector is a forward spectrometer at the Large Hadron Collider (LHC) at CERN. The experiment is designed for precision measurements of CP violation and rare decays of beauty and charm hadrons. In this paper the performance of the various LHCb sub-detectors and the trigger system are described, using data taken from 2010 to 2012. It is shown that the design criteria of the experiment have been met. The excellent performance of the detector has allowed the LHCb collaboration to publish a wide range of physics results, demonstrating LHCb's unique role, both as a heavy flavour experiment and as a general purpose detector in the forward region.
collaboration T.L.
Journal of Instrumentation scimago Q2 wos Q3
2014-12-05 citations by CoLab: 116 Abstract  
Measuring cross-sections at the LHC requires the luminosity to be determined accurately at each centre-of-mass energy root s. In this paper results are reported from the luminosity calibrations carried out at the LHC interaction point 8 with the LHCb detector for root s = 2.76, 7 and 8TeV (proton-proton collisions) and for root s(NN) = 5TeV (proton-lead collisions). Both the "van der Meer scan" and "beam-gas imaging" luminosity calibration methods were employed. It is observed that the beam density profile cannot always be described by a function that is factorizable in the two transverse coordinates. The introduction of a two-dimensional description of the beams improves significantly the consistency of the results. For proton-proton interactions at root s = 8TeV a relative precision of the luminosity calibration of 1.47% is obtained using van der Meer scans and 1.43% using beam-gas imaging, resulting in a combined precision of 1.12%. Applying the calibration to the full data set determines the luminosity with a precision of 1.16%. This represents the most precise luminosity measurement achieved so far at a bunched-beam hadron collider.
Adinolfi M., Aglieri Rinella G., Albrecht E., Bellunato T., Benson S., Blake T., Blanks C., Brisbane S., Brook N.H., Calvi M., Cameron B., Cardinale R., Carson L., Contu A., Coombes M., et. al.
European Physical Journal C scimago Q1 wos Q2 Open Access
2013-05-14 citations by CoLab: 357 Abstract  
The LHCb experiment has been taking data at the Large Hadron Collider (LHC) at CERN since the end of 2009. One of its key detector components is the Ring-Imaging Cherenkov (RICH) system. This provides charged particle identification over a wide momentum range, from 2–100 GeV/c. The operation and control, software, and online monitoring of the RICH system are described. The particle identification performance is presented, as measured using data from the LHC. Excellent separation of hadronic particle types (π, K, p) is achieved.
Cisek A., Schäfer W., Szczurek A.
Physical Review C scimago Q1 wos Q2
2012-07-11 citations by CoLab: 45 Abstract  
Heavy nuclei at collider energies are a source of high energy Weizsaecker-Williams photons. This photon flux may be utilized to study high energy photon-nucleus interactions. Here we concentrate on the coherent diffractive production of heavy vector mesons on nuclear targets and show how it probes the unintegrated glue of the nucleus in the saturation domain. We present predictions for rapidity distributions of exclusive coherent J/Psi and Upsilon mesons which can be measured by the ALICE experiment at the LHC.
Guzey V., Strikman M.
Physical Review C scimago Q1 wos Q2
2024-10-07 citations by CoLab: 0 Abstract  
We determine the nuclear suppression factor SPb(x), where x=MJ/ψ2/Wγp2 with MJ/ψ the J/ψ mass and Wγp the photon-nucleon energy, for the cross section of coherent J/ψ photoproduction in heavy-ion ultraperipheral collisions at the Large Hadron Collider and Relativistic Heavy Ion Collider by performing the χ2 fit to all available data on the cross section dσAA→J/ψAA/dy as a function of the J/ψ rapidity y and the photoproduction cross section σγA→J/ψA(Wγp) as a function of Wγp. We find that while the dσAA→J/ψAA/dy data alone constrain SPb(x) for x≥10−3, the combined dσAA→J/ψAA/dy and σγA→J/ψA(Wγp) data allow us to determine SPb(x) in the wide interval 10−5<x<0.05. In particular, the data favor SPb(x), which decreases with a decrease of x in the 10−4<x<0.01 interval and can be both decreasing or constant for x<10−4. Identifying SPb(x) with the ratio of the gluon distributions in Pb and the proton Rg(x,Q02)=gA(x,Q02)/[Agp(x,Q02)], we demonstrate that the leading twist approximation for nuclear shadowing provides a good description of all the data on dσAA→J/ψAA/dy and σγA→J/ψA(Wγp) as well as on the experimental values for SPb(x) derived from σγA→J/ψA(Wγp). We also show that modern nuclear parton distributions reasonably reproduce SPb(x) as well. Published by the American Physical Society 2024
Lukashenko V.
2024-06-23 citations by CoLab: 0
Altmann J., Andres C., Andronic A., Antinori F., Antonioli P., Beraudo A., Berti E., Bianchi L., Boettcher T., Capriotti L., Christiansen P., Contreras Nuño J.G., Cunqueiro Mendez L., da Silva C., Dainese A., et. al.
European Physical Journal C scimago Q1 wos Q2 Open Access
2024-04-23 citations by CoLab: 3 PDF Abstract  
AbstractThis paper is a write-up of the ideas that were presented, developed and discussed at the fourth International Workshop on QCD Challenges from pp to AA, which took place in February 2023 in Padua, Italy. The goal of the workshop was to focus on some of the open questions in the field of high-energy heavy-ion physics and to stimulate the formulation of concrete suggestions for making progresses on both the experimental and theoretical sides. The paper gives a brief introduction to each topic and then summarizes the primary results.
Acharya S., Adamová D., Adler A., Aglieri Rinella G., Agnello M., Agrawal N., Ahammed Z., Ahmad S., Ahn S. ., Ahuja I., Akindinov A., Al-Turany M., Aleksandrov D., Alessandro B., Alfanda H. ., et. al.
Physical Review Letters scimago Q1 wos Q1 Open Access
2024-04-19 citations by CoLab: 2 Abstract  
The first measurement of the cross section for incoherent photonuclear production of J/ψ vector mesons as a function of the Mandelstam |t| variable is presented. The measurement was carried out with the ALICE detector at midrapidity, |y|<0.8, using ultraperipheral collisions of Pb nuclei at a center-of-mass energy per nucleon pair of sNN=5.02  TeV. This rapidity interval corresponds to a Bjorken-x range (0.3–1.4)×10−3. Cross sections are given in five |t| intervals in the range 0.04<|t|<1  GeV2 and compared to the predictions by different models. Models that ignore quantum fluctuations of the gluon density in the colliding hadron predict a |t| dependence of the cross section much steeper than in data. The inclusion of such fluctuations in the same models provides a better description of the data. © 2024 CERN, for the ALICE Collaboration 2024 CERN
Tumasyan A., Adam W., Andrejkovic J. ., Bergauer T., Chatterjee S., Damanakis K., Dragicevic M., Escalante Del Valle A., Hussain P. ., Jeitler M., Krammer N., Lechner L., Liko D., Mikulec I., Schieck J., et. al.
Physical Review Letters scimago Q1 wos Q1 Open Access
2023-12-28 citations by CoLab: 12 Abstract  
Quasireal photons exchanged in relativistic heavy ion interactions are powerful probes of the gluonic structure of nuclei. The coherent $J/\ensuremath{\psi}$ photoproduction cross section in ultraperipheral lead-lead collisions is measured as a function of photon-nucleus center-of-mass energies per nucleon (${W}_{\ensuremath{\gamma}\mathrm{N}}^{\mathrm{Pb}}$) over a wide range of $40<{W}_{\ensuremath{\gamma}\mathrm{N}}^{\mathrm{Pb}}<400\text{ }\text{ }\mathrm{GeV}$. Results are obtained using data at the nucleon-nucleon center-of-mass energy of 5.02 TeV collected by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of $1.52\text{ }\text{ }{\mathrm{nb}}^{\ensuremath{-}1}$. The cross section is observed to rise rapidly at low ${W}_{\ensuremath{\gamma}\mathrm{N}}^{\mathrm{Pb}}$, and plateau above ${W}_{\ensuremath{\gamma}\mathrm{N}}^{\mathrm{Pb}}\ensuremath{\approx}40\text{ }\text{ }\mathrm{GeV}$, up to $400\text{ }\text{ }\mathrm{GeV}$, entering a new regime of small Bjorken-$x$ ($\ensuremath{\approx}6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$) gluons being probed in a heavy nucleus. The observed energy dependence is not predicted by current quantum chromodynamic models.
Kryshen E., Strikman M., Zhalov M.
Physical Review C scimago Q1 wos Q2
2023-08-08 citations by CoLab: 3 Abstract  
We present predictions for the cross sections of the coherent and incoherent $J/\ensuremath{\psi}$ photoproduction in ultraperipheral collisions at the RHIC and at the LHC calculated for different classes of events depending on the presence of neutrons emitted by colliding nuclei. Since strong nucleus-nucleus interactions in UPCs are suppressed, it is usually assumed that neutrons at forward rapidities originate mainly from the electromagnetic dissociation of colliding nuclei caused by additional photon exchanges. This is a reasonable assumption for the coherent photoproduction where the state of the target nucleus remains intact. We consider additional sources of neutrons in the incoherent quasielastic and nucleon dissociative $J/\ensuremath{\psi}$ photoproduction and show that these processes significantly change probabilities of neutron emission compared to calculations when only neutrons from electromagnetic dissociation of nuclei are considered. Such studies should allow one to explore the dynamics of nuclear shadowing in the incoherent $J/\ensuremath{\psi}$ photoproduction down to $x\ensuremath{\approx}{10}^{\ensuremath{-}5}$.
Klein S.R.
Physical Review C scimago Q1 wos Q2
2023-05-16 citations by CoLab: 4 Abstract  
High-energy vector meson photoproduction is an important tool for studying the partonic structure of matter at low Bjorken $x$. In the Good-Walker (GW) paradigm, the cross section $d\ensuremath{\sigma}/dt$ for coherent production of vector mesons or other final states depends the average transverse distribution of gluons, while the incoherent cross section depends on fluctuations in the nuclear structure, due to variations in nucleon positions, and/or gluonic hot spots. However, predictions of the the GW paradigm seemingly conflict with data from multiple experiments which observe coherent production of vector mesons accompanied by nuclear excitation, or in peripheral relativistic heavy-ion collisions. These data are consistent with a simpler, semiclassical approach. I will discuss this contradiction and explore how and why GW fails. I will also contrast the significant differences in incoherent photoproduction on $^{197}\mathrm{Au}$ and $^{208}\mathrm{Pb}$ targets in the GW approach with the much smaller expected differences in their low-$x$ gluon content.
Eskola K.J., Flett C.A., Guzey V., Löytäinen T., Paukkunen H.
Physical Review C scimago Q1 wos Q2
2023-04-28 citations by CoLab: 17 Abstract  
We present predictions for the cross sections of coherent $J/\ensuremath{\psi}$ photoproduction in lead-lead and oxygen-oxygen ultraperipheral collisions (UPCs) as a function of the $J/\ensuremath{\psi}$ rapidity at the LHC in the framework of collinear factorization at next-to-leading order (NLO) in perturbative QCD. Taking generalized parton distribution functions in their forward limit and using the EPPS21, nNNPDF3.0, and nCTEQ15WZSIH nuclear parton distribution functions, we update our recent results for Pb-Pb collisions, make detailed predictions for O-O collisions for several beam energy configurations, and examine the ratio of O-O and Pb-Pb UPC cross sections. We show that the latter observable allows one to significantly reduce the scale uncertainty of NLO predictions for this process.
Mäntysaari H., Salazar F., Schenke B.
Physical Review D scimago Q1 wos Q1
2022-10-17 citations by CoLab: 24 Abstract  
We show that when saturation effects are included one obtains a good description of the exclusive $\mathrm{J}/\ensuremath{\psi}$ production spectra in ultraperipheral lead-lead collisions as recently measured by the ALICE Collaboration at the LHC. As exclusive spectra are sensitive to the spatial distribution of nuclear matter at small Bjorken-$x$, this implies that gluon saturation effects modify the impact parameter profile of the target as we move towards small $x$. In addition to saturation effects, we find a preference for larger nuclear strong-interaction radii compared to the typical charge radius. We demonstrate the role of finite photon transverse momentum and the interference between the cases for which the role of photon emitter and target are switched between the nuclei. We show that these effects are comparable to the experimental precision for ${p}_{T}$-differential cross sections and as such need to be included when comparing to LHC data. Finally, the integrated $\mathrm{J}/\ensuremath{\psi}$ production cross sections from the LHC and preliminary transverse momentum spectra from RHIC are shown to prefer calculations with fluctuating nucleon substructure, although these datasets would require even stronger saturation effects than predicted from our framework.
Brandenburg J.D., Xu Z., Zha W., Zhang C., Zhou J., Zhou Y.
Physical Review D scimago Q1 wos Q1
2022-10-12 citations by CoLab: 15 Abstract  
We study azimuthal asymmetries in diffractive $\mathrm{J}/\ensuremath{\psi}$ production in ultraperipheral heavy-ion collisions at RHIC and LHC energies using the color glass condensate effective theory. Our calculation successfully describes the azimuthal averaged $J/\ensuremath{\psi}$ production cross section measured by STAR and ALICE. We further predict very large $\mathrm{cos}2\ensuremath{\phi}$ and $\mathrm{cos}4\ensuremath{\phi}$ azimuthal asymmetries for diffractive $J/\ensuremath{\psi}$ production both in UPCs at RHIC and LHC energies and in eA collisions at EIC energies. These novel polarization dependent observables may provide complementary information for constraining gluon transverse spatial distribution inside large nuclei. As compared to all previous analysis of diffractive $J/\ensuremath{\psi}$ production, the essential new elements integrated in our theoretical calculations are: the double-slit interference effect, the linear polarization of coherent photons, and the final state soft photon radiation effect.
Eskola K.J., Flett C.A., Guzey V., Löytäinen T., Paukkunen H.
Physical Review C scimago Q1 wos Q2
2022-09-15 citations by CoLab: 28 Abstract  
We present the first next-to-leading-order (NLO) perturbative QCD (pQCD) study of rapidity-differential cross sections of coherent exclusive photoproduction of $J/\ensuremath{\psi}$ mesons in heavy-ion ultraperipheral collisions (UPCs) at the CERN Large Hadron Collider (LHC), $d\ensuremath{\sigma}/dy(\text{Pb}+\text{Pb}\ensuremath{\rightarrow}\text{Pb}+J/\ensuremath{\psi}+\text{Pb})$. For this, we account for the photon-nucleon NLO cross sections at the forward limit, the $t$ dependence using a standard nuclear form factor, and the photon fluxes of the colliding nuclei. Approximating the generalized parton distributions with their forward-limit parton distribution functions (PDFs), we quantify the NLO contributions in the cross sections, show that the real part of the amplitude and quark-PDF contributions must not be neglected, quantify the uncertainties arising from the scale choice and PDFs, and compare our results with ALICE, CMS, and LHCb $J/\ensuremath{\psi}$ photoproduction data in $\mathrm{Pb}+\mathrm{Pb}$ UPCs, exclusive $J/\ensuremath{\psi}$ photoproduction data from HERA, and LHCb data in $p+p$. The scale dependence in $d\ensuremath{\sigma}/dy(\text{Pb}+\text{Pb}\ensuremath{\rightarrow}\text{Pb}+J/\ensuremath{\psi}+\text{Pb})$ is significant, but we can find a scale choice that reproduces the $\mathrm{Pb}+\mathrm{Pb}$ UPC data at both 2.76 and 5.02 TeV collision energies. This process has traditionally been suggested to be a direct probe of nuclear gluon distributions. We show that the situation changes rather dramatically from LO to NLO: the NLO cross sections reflect the nuclear effects of both gluons and quarks in a complicated manner, where the relative signs of the LO and NLO terms in the amplitude play a significant role.

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