Exclusive J/Psi Photoproduction Off Protons In Ultraperipheral P-Pb Collisions At Root S(Nn)=5.02 Tev
B I Abelev,Jaroslav Adam,D Adamova, M M Aggarwal,G Aglieri Rinella,M Agnello,A Agostinelli,N Agrawal, Z Ahammed,Nuzhat A Ahmad,Ijaz Ahmed,S U Ahn,I Aimo,S Aiola,M Ajaz,A Akindinov, Sk Noor Alam,D Aleksandrov, B Alessandro,D Alexandre,A Alici,A Alkin, J Alme,T Alt,S Altinpinar,I Altsybeev,C Alves Garcia Prado,C Andrei, A Andronic,V Anguelov, J Anielski,T Anticic,F Antinori, P Antonioli, L Aphecetche,H Appelshauser, S Arcelli,N Armesto,R Arnaldi, T Aronsson,I C Arsene, M Arslandok, A Augustinus, R Averbeck, T C Awes,M D Azmi,M Bach,A Badala,Y W Baek,S Bagnasco,R Bailhache, Raja Bala, A Baldisseri,F Baltasar Dos Santos Pedrosa, Rama Chandra Baral,R Barbera,Francesco Barile,Gergely Gabor Barnafoldi, L S Barnby,V Barret, J Bartke, M Basile,N Bastid, Saibal Basu,B Bathen,G Batigne, A Batista Camejo,B Batyunya, Paul Christoph Batzing,C Baumann,I G Bearden, H P Beck,Cristina Bedda, Nirbhay Kumar Behera,I Belikov,F Bellini,R Bellwied,E Belmontmoreno,R Belmont, Vladimir Belyaev, Gyula Bencedi,S Beole,I Berceanu,A Bercuci,Y Berdnikov,Daniel Berenyi,M Berger, Redmer Alexander Bertens,Dario Berzano, L Betev, A Bhasin, Inayat Rasool Bhat, A K Bhati, Buddhadeb Bhattacharjee, Jihyun Bhom,Livio Bianchi,N Bianchi,C Bianchin, J Bielcik, J Bielcikova,A Bilandzic, S Bjelogrlic,F Blanco, D Blau,C Blume, Friederike Bock,A Bogdanov,H Boggild,M Bogolyubsky, F V Bohmer, L Boldizsar,M Bombara,J Book,H Borel,A Borissov,F Bossu, M Botje,E Botta,S Bottger, P Braunmunzinger,M Bregant,T Breitner, Theo Alexander Broker, Tyler Allen Browning, Michal Broz,E Bruna,G Bruno,D Budnikov,H Buesching, S Bufalino,P Buncic,Oliver Busch,Z Buthelezi,D Caffarri,X Cai,H Caines, L Calero Diaz, Alberto Caliva,E Calvo Villar,P Camerini, F Carena,W Carena,J Castillo Castellanos,Ester Anna Rita Casula,V Catanescu,C Cavicchioli,C Sanchez, Jan Cepila,P Cerello,B Chang,S Chapeland,J L Charvet,Sreya Chattopadhyay, Volodymyr Chelnokov, M Cherney,C Cheshkov,B Cheynis,V Chibante Barroso,D D Chinellato, P Chochula,M Chojnacki, Somnath Choudhury,P Christakoglou,C H Christensen,P Christiansen,T Chujo,S U Chung,C Cicalo, L Cifarelli, F Cindolo, J Cleymans, F Colamaria, Domenico Colella,Alberto Collu, Manuel Colocci,G Conesa Balbastre,Z Conesa Del Valle,M Connors,J G Contreras, T M Cormier,Y Corrales Morales,P Cortese,I Cortes Maldonado,M R Cosentino,F Costa,Philippe Crochet, R Cruz Albino,E Cuautle,L Cunqueiro,A Dainese,Ruina Dang,A Danu,Dipak K Das,I Das,Kalyan Kumar Das,Samar K Das, A P Dash,S Dash,Sudipan De,H Delagrange,A Deloff,E Denes,G Derasmo,A De Caro,G De Cataldo,J De Cuveland,A De Falco,D De Gruttola,N De Marco,S De Pasquale,R De Rooij,M A Diaz Corchero, T Dietel, Pascal Dillenseger,R Divia,D Di Bari,S Di Liberto,A Di Mauro,P Di Nezza,O Djuvsland,A Dobrin,T Dobrowolski,D Domenicis Gimenez, Benjamin Donigus,O Dordic, S Dorheim,A K Dubey, Andrea Dubla,L Ducroux,P Dupieux,A K Dutta Majumdar,Timo Eero Hilden, Raymond James Ehlers,D Elia,H Engel,B Erazmus,H A Erdal,Dominic Eschweiler,B Espagnon,M Esposito, M Estienne, S Esumi,David A Evans, Sergey Evdokimov,D Fabris,J Faivre,D Falchieri,A Fantoni,M Fasel,D Fehlker,Linus Feldkamp,D Felea, A Feliciello,G Feofilov, J Ferencei,A Fernandez Tellez,E G Ferreiro, A Ferretti, Andrea Festanti,J Figiel,M A S Figueredo,S Filchagin,D Finogeev,F M Fionda,E M Fiore, E G Floratos,M Floris,S Foertsch,P Foka,S L Fokin,E Fragiacomo, Andrea Francescon,U Frankenfeld,U Fuchs,C Furget, Artur Furs,M Fusco Girard,J J Gaardhoje,M Gagliardi,A Gago,M Gallio,D R Gangadharan,P Ganoti,C Gao,C Garabatos, E Garciasolis,C Gargiulo,I Garishvili,J Gerhard,M Germain, A Gheata,M Gheata,B Ghidini,Premomoy Ghosh,S Ghosh, P Gianotti,P Giubellino,E Gladyszdziadus,P Glassel,A Gomez Ramirez,P Gonzalezzamora,S Gorbunov, L Gorlich,S Gotovac, Lukasz Kamil Graczykowski,A Grelli,A Grigoras,Costin Grigoras,V Grigoriev,A Grigoryan, Smbat Grigoryan,B Grinyov,N Grion,Jan Fiete Grosseoetringhaus, J Y Grossiord, R Grosso,F Guber,R Guernane,B Guerzoni,M Guilbaud,K Gulbrandsen,H Gulkanyan, M Gumbo,T Gunji, A Gupta, R Gupta,K H Khan, Rudiger Haake, Oystein Senneset Haaland, C Hadjidakis,M Haiduc,H Hamagaki,G Hamar, L D Hanratty, A G Hansen, J W Harris,H Hartmann, Austin Vincent Harton,D Hatzifotiadou,Shinichi Hayashi, Stefan Thomas Heckel,Markus Ansgar Heide,H Helstrup,A Herghelegiu,G Herrera Corral, Benjamin Andreas Hess,K F Hetland, B Hippolyte,J Hladky,P Hristov,M Huang, T J Humanic,N Hussain, Donald J Hutter,Deog Su Hwang,R Ilkaev,I Ilkiv,M Inaba, Gian Michele Innocenti,C Ionita,M Ippolitov,M Irfan,M V Ivanov,V Ivanov,A Jacholkowski, P Jacobs, Cristiane Jahnke,Haeng Jin Jang,M Janik, P H S Y Jayarathna,C Jena,Satyajit Jena,R T Jimenez Bustamante, P G Jones, H Jung,A Jusko, V Kadyshevskiy,S Kalcher, Peter Kalinak,Alexander Philipp Kalweit,J Kamin, J H Kang, V A Kaplin,Somnath Kar,A Karasu Uysal, Oleg Karavichev,T Karavicheva, Evgeny Karpechev,U Kebschull,R Keidel, D L D Keijdener,M Keil Svn,M M Khan,P Khan,Shuaib Ahmad Khan,A Khanzadeev,Yu V Kharlov,Bjarte Kileng, Byounggie Kim,D W Kim,Ji Soo Kim,Minsik Kim, Samdong Kim,Taehun Kim,S Kirsch,I Kisel,S Kiselev,A Kisiel,G G Kiss,J Klay,Jonah D Klein,C Kleinbosing,A Kluge, Michael Linus Knichel,A G Knospe,Chinorat Kobdaj,Monika Kofarago, M K Kohler,T Kollegger,A Kolojvari,V Kondratiev, Natalia Kondratyeva, A Konevskikh,Vladimir Kovalenko,M Kowalski,S Kox,G Koyithatta Meethaleveedu,J F Kral,I Kralik,A Kravcakova, Michal Krelina,Moritz Kretz,M Krivda, F Krizek, Evgeny Kryshen,M Krzewicki,Vladimir Kucera,Y Kucheriaev,Thanushan Kugathasan,C Kuhn,P G Kuijer, Igor Kulakov,Jitendra Kumar,Podist Kurashvili,A B Kurepin,A Kuryakin,S Kushpil,M J Kweon,Y Kwon,P Ladron De Guevara, C Lagana Fernandes,Igor Lakomov,Rune Langoy,C Lara, Antoine Xavier Lardeux, Alessandra Lattuca,S L La Pointe,P La Rocca, Rod A Lea, Lucia Leardini, Graham Richard Lee,Iosif Legrand,J Lehnert, R C Lemmon,V Lenti, Emilia Leogrande, Marco Leoncino,I Leon Monzon,Peter Levai,S Li,J Lien,R Lietava,Svein Lindal,V Lindenstruth,Christian Lippmann, M A Lisa, Hans Martin Ljunggren, Davide Francesco Lodato,P I Loenne,V R Loggins,Vitaly Loginov,D Lohner, C Loizides,X Lopez,E Lopez Torres,X G Lu,P Luettig,M Lunardon,G Luparello,R Ma,A Maevskaya,Magnus Mager,D P Mahapatra, Sohail Musa Mahmood,Antonin Maire,R Majka,Mikhail Malaev,I Maldonado Cervantes,L Malinina, Dmitry Malkevich, P Malzacher,A Mamonov,L Manceau,V I Manko,F Manso,V Manzari,Massimiliano Marchisone, J J Mares,G V Margagliotti, A Margotti,A Marin, C Markert, Marco Marquard,I Martashvili, Nicole Alice Martin,P Martinengo,M Martinez,G Martinez Garcia, J Martin Blanco,Y Martynov,A Mas,S Masciocchi,M Masera,Alberto Masoni,L Massacrier,A Mastroserio,A Matyja,C Mayer, Joel Anthony Mazer,M A Mazzoni,F Meddi,A Menchacarocha, Elisa Meninno,J Mercado Perez, Michal Meres, Y Miake,Konstantin Mikhaylov,Leonardo Milano,Jovan Milosevic, A Mischke, Aditya Nath Mishra,D Mis̈kowiec,J Mitra,Ciprian Mihai Mitu,J Mlynarz, Naghmeh Mohammadi, B C Mohanty,L Molnar,L Montano Zetina,E Montes,M Morando,D A Moreira De Godoy,S Moretto, A Morreale,Andreas Morsch, V Muccifora,Eugen Mudnic, Daniel Michael Muhlheim,Sanjib Muhuri,M Mukherjee,H W Muller, M G Munhoz, S S Murray,L Musa, Jan Musinsky, B K Nandi, R Nania,E Nappi,C Nattrass,Krishna S Nayak, T K Nayak,S Nazarenko,A Nedosekin,Maria Nicassio, Mihai Niculescu, B S Nielsen,S Nikolaev,S Nikulin,Vladimir Nikulin,B S Nilsen,F Noferini,P Nomokonov,G Nooren,J Norman,A S Nyanin, J Nystrand,H Oeschler,S K Oh,Ali Okatan, Laszlo Olah,Janusz Oleniacz,A C Oliveira Da Silva, Jacobus Onderwaater,C Oppedisano,A Ortiz Velasquez,A Oskarsson,J Otwinowski,Katsunori Oyama, Mahmut Ozdemir,P K Sahoo,Yvonne Chiara Pachmayer,M Pachr,P Pagano,G Paic,F Painke,C Pajares, S K Pal,Agostino Palmeri,Divya Darshan Pant,Vardanush Papikyan,G S Pappalardo,P Pareek,W J Park, Sonia Parmar,Annika Passfeld,D I Patalakha,V Paticchio,Bijan Kumar Paul,T Pawlak, T Peitzmann,H Pereira Da Costa,E Pereira De Oliveira Filho,D Peresunko,C E Perez Lara,A Pesci, Vladimir Peskov,Y Pestov,V Petracek, M Petran,M Petris,M Petrovici,Carlos Alberto Petta,S Piano,M Pikna,P Pillot,O Pinazza,L Pinsky, Danthasinghe Piyarathna,M Ploskon,M Planinic,J Pluta,Sona Pochybova,P L M Podestalerma, Martin Poghosyan, Esko Heikki Oskari Pohjoisaho,B Polichtchouk,N Poljak,A Pop, S Porteboeufhoussais, Joseph F Porter,B V K S Potukuchi,Sushil K Prasad,R Preghenella,F Prino, C Pruneau, Igor Pshenichnov,G Puddu,P R Pujahari, Valery Punin, J Putschke,Henrik Qvigstad,A Rachevski,Sibaji Raha,Janusz Rak,A Rakotozafindrabe,L Ramello, R Raniwala,S Raniwala, Sami Sakari Rasanen, Bogdan Theodor Rascanu,Deepika Rathee, A W Rauf, Vahedeh Razazi,K F Read,J S Real,Krzysztof Redlich, Rosi Jan Reed,A Rehman, P Reichelt, Martijn Reicher,Felix Reidt, R Renfordt,A R Reolon,A Reshetin,F Rettig, J P Revol,K Reygers,V Riabov,R A Ricci, T Richert,M Richter,P Riedler,W Riegler,F Riggi,A Rivetti, E Rocco,M Rodriguez Cahuantzi,A Rodriguez Manso,Knut Roed, Elena Rogochaya, 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PHYSICAL REVIEW LETTERS（2014）
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摘要
We present the first measurement at the LHC of exclusive J/psi photoproduction off protons, in ultraperipheral proton-lead collisions at root s(NN) = 5.02 TeV. Events are selected with a dimuon pair produced either in the rapidity interval, in the laboratory frame, 2.5 < y < 4 (p-Pb) or -3.6 < y < -2.6 (Pb-p), and no other particles observed in the ALICE acceptance. The measured cross sections sigma(gamma + p -> J/psi + p) are 33.2 +/- 2.2(stat) +/- 3.2(syst) +/- 0.7(theor) nb in p-Pb and 284 +/- 36(stat)(-32)(+27)(syst) +/- 26(theor) nb in Pb-p collisions. We measure this process up to about 700 GeV in the gamma p center of mass, which is a factor of two larger than the highest energy studied at HERA. The data are consistent with a power law dependence of the J/psi photoproduction cross section in gamma p energies from about 20 to 700 GeV, or equivalently, from Bjorken x scaling variable between similar to 2 x 10(-2) and similar to 2 x 10(-5), thus indicating no significant change in the gluon density behavior of the proton between HERA and LHC energies.
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