Probing Small Bjorken-x Nuclear Gluonic Structure via Coherent J/ψ Photoproduction in Ultraperipheral Pb-Pb Collisions at sqrt[s_{NN}]=5.02 TeV.

A Tumasyan,P Azzi,J Guiang,H Bandyopadhyay,J Rotter,G Gomez-Ceballos,E Leutgeb,M Sonawane,O Amram,P Wittich,A Carvalho Antunes De Oliveira,A Sanchez,T T Tran,M Kadastik,P Robmann,J Pata,N Smith,C E Gerber,T Kwon,H Bouchamaoui,H R Jabusch,M Bachtis,A Droll,E Eskut,J Martins,I Pedraza,A De Cosa,G Tamulaitis,T Ivanov,H Flacher,P G Kosmoglou Kioseoglou,S Abu Zeid,O Behnke,A Ryd,D Acosta,I Hos,Z S Demiroglu,S Parolia,S Tkaczyk,K Ocalan,A Mestvirishvili,L Wiens,Q Guo,I De Bruyn,S Choi,C E Perez Lara,P De Barbaro,E Garutti,T Aushev,N Voytishin,A Singla,V Shang,A Manousakis-Katsikakis,D Diaz,P Schleper,C Kapsiak,M Kovac,P Govoni,B Camaiani,M De Silva,M Malawski,D Teyssier,A C Mignerey,K A Hahn,K Mazumdar,K Harder,W Lange,I Bubanja,S C Eno,A Williams,L I Estevez Banos,G Bardelli,J Duarte,J Duarte Campderros,X Chen,D Cussans,M Donegà,O Viazlo,T Ziemons,A Kyriakis,I Zisopoulos,K Hurtado Anampa,H Kim,J Choi,W L Aldá Júnior,R Breedon,K Lee,J E Cole,L Ristori,G Quast,S Beauceron,E S Bols,V Makarenko,N Minafra,K Mota Amarilo,D Rosenzweig,A Nayak,P Siddireddy,G Umoret,O Kaya,Y Maravin,C S Moon,R Paramatti,O Bouhali,A Tishelman-Charny,J Berryhill,C Collard,A Ledovskoy,A Di Mattia,A K Sikdar,S Mondal,S Buontempo,C Jessop,P Salvini,H D Yoo,Y Y Li,M Mendizabal Morentin,S Rudrabhatla,D Bastos,C Brew,G Bagliesi,P R Pujahari,L Caminada,O Teryaev,P Chatagnon,H J Simonis,M Glowacki,A Sharma,P Janot,R Seidita,S Yang,S Bhattacharya,X Lyu,L Lyons,A Loeliger,D D Redondo Ferrero,W Si,P G Mercadante,A Perloff,E Brondolin,W Elmetenawee,K Liyanage,F Jensen,G N Kim,S Yuan,M Misheva,P Palit,A Zacharopoulou,M Swartz,A Laha,S Paoletti,H Qu,Y Roh,P Silva,G Karapinar,S Hogan,D Leggat,S W Lee,H Petrow,G S F Stephans,L Yuan,J Schindler,T Á Vámi,S Keshri,E Olaiya,L Calligaris,T Lindén,E W Vaandering,D Colling,A Hakimi,C Aimè,S Banerjee,G Bakas,A Trapote,J Lawrence,A Krishna,D Pellett,A Samalan,K Lassila-Perini,Y Xiang,F Nessi-Tedaldi,L Guzzi,A Modak,M Huwiler,S Giani,S Y Hoh,M Maggi,J G Branson,F Damas,S Cittolin,M Mieskolainen,Y An,Y Assran,Y Ban,F Simpson,R Radogna,M Teroerde,M I Asghar,I.-A Melzer-Pellmann,L Horyn,S M Silva Do Amaral,D Song,G B Cerati,J Madhusudanan Sreekala,C Uribe Estrada,M Gordon,G Kopp,R M Chatterjee,D Spiga,M Paganoni,F Rehm,K Rabbertz,Y Feng,C Vico Villalba,M Pieri,M Pierini,P Spagnolo,S Nabili,M Jeitler,J Salfeld-Nebgen,M Bluj,A Staiano,Sandra S Padula,D Wang,A Mecca,P Dini,J A Reyes Vega,V Golovtcov,I Yusuff,B Mcmaster,M Jones,R Wolf,H Rejeb Sfar,D Lelas,T Rohe,L H Vage,T Liu,J Zhang,K Black,A Aravind,W A Nash,H Routray,D Brunner,E Lusiani,L Brennan,K Dilsiz,S Bianco,S Norberg,M Missiroli,M Murray,J Xiao,T Sheokand,P Rebello Teles,A B Meyer,G Salvi,M Rodozov,M Tadel,V Cepaitis,C Kleinwort,M Myllymäki,V Korenkov,M Pelliccioni,T Carnahan,C Tully,O Neogi,A Hart,D Hits,S Wunsch,O Radchenko,L Gouskos,M Górski,V K Muraleedharan Nair Bindhu,P Montagna,A Ventura Barroso,A Geiser,M Alhusseini,A Agapitos,V Chekhovsky,C Battilana,M Bartók,A Jofrehei,F M Simone,S Xie,P Kalbhor,W Li,W Lin,M Monteno,L Guiducci,P Adzic,A Buchot Perraguin,A Snigirev,A Askew,P K Rout,D Eliseev,D Ciangottini,H Nogima,T Novak,H El Mamouni,M Eich,A Thachayath,J Damgov,D U J Sonnadara,Y Maghrbi,S Lammel,P Zotto,A Braghieri,T Q Nguyen,B Grynyov,H Bakhshiansohi,L Martikainen,M Lizzo,B Cox,K Cankocak,H S Kim,G Sorrentino,N Perera,M Dragicevic,H Brandao Malbouisson,N Pastika,P Simkina,F Siviero,V Brigljevic,R Clare,R Ulrich,R Kansal,C Li,I Bestintzanos,K Hoepfner,A Zimermmane Castro Santos,F Vazquez Valencia,C Nicolaou,V Veszpremi,E Robutti,H Reithler,E Tuominen,L Forthomme,D Y Kang,Cristina F Bedoya,U Joshi,V Wachirapusitanand,M Lethuillier,R Demina,A Latorre,M C Fouz,M Roguljic,L Malgeri,S Cerci,M A Wadud,A Herve,A Frankenthal,C Palmer,C Prieels,A Novak,P Busson,M Finger,C Mariotti,W Busza,G Madigan,M Kumar,C Snyder,R Y Zhu,L Uvarov,V Rodríguez Bouza,C Martin Perez,J Jaramillo,A Benecke,R Aly,M Quinnan,S Gascon,A Gandrakota,M Cipriani,R K Dewanjee,G B Mohanty,T Schuh,P Verwilligen,R Kinnunen,V Sulimov,I Zhizhin,S Schnetzer,H Acharya,A Vagnerini,C Huh,X Coubez,W Jang,P S Chen,R Lipton,P David,N Lychkovskaya,J Fay,M Besancon,A Lobanov,I Laflotte,S Somalwar,A Rinkevicius,W Funk,A Roberts,S Varghese,E Butz,J R Komaragiri,A Messineo,E Barberis,D Stuart,J M Hernandez,A G Delannoy,M Backhaus,C Savard,M R Darwish,F Setti,H Mei,M F Canelli,J Metwally,R Horisberger,C K Koraka,J Luo,S Mondal,P Van Mechelen,L S Durkin,M Yalvac,C Madrid,A Martelli,I Das,A J Li,A Vilela Pereira,I Gonzalez Caballero,F Würthwein,E Bossini,H Kaveh,A Mehta,M Finger,A Florent,E Shumka,P Saha,A Belyaev,T Kramer,N Trevisani,G Boldrini,V Murzin,E Gallo,P Zalewski,Y C Yang,D Ruini,T Bose,E Focardi,S Zaleski,M Narain,M Mannelli,W G D Dharmaratna,S Costa,W Adam,D Li,E Boos,H El Faham,A Canepa,J Kim,J Park,M Tornago,Y Lee,N Stylianou,M H Hassanshahi,A Mallampalli,S Sekhar,O K Köseyan,C Delaere,S Summers,A Warden,M Revering,S Bein,J Wilson,A R Kanuganti,M Shchedrolosiev,D Krofcheck,S Barman,N Parashar,T Kello,A R Sahasransu,R Erbacher,J Conway,F Errico,K Gill,S Seif El Nasr-Storey,G Chaudhary,B Bylsma,D Agyel,F Moscatelli,T Koeth,N Raicevic,O Karacheban,H Bialkowska,Q Li,R Potenza,I Makarenko,F Riti,C Mironov,E M Da Costa,B C Radburn-Smith,T Elkafrawy,T Boccali,D Valsecchi,A Cagnotta,K Lee,K Mandal,L Fanò,S Yang,L Valencia Palomo,D Del Re,S Tuo,P Bortignon,G M Bilei,C Grab,K Borras,M Voutilainen,D Selivanova,M Cremonesi,P Raics,F Ramirez,P Capiluppi,K Christoforou,N Wickramage,K Salyer,S Banerjee,M Alyari,J Wang,T Lampén,U Sarkar,H Lee,C Martinez Rivero,P C Tiwari,M Saunders,G Parida,J P Fernández Ramos,B Klima,A Zarubin,L Orsini,L Urda Gómez,R Kumar Verma,I Margjeka,A Castaneda Hernandez,S Mitra,K W Bell,T K Aarrestad,F Cetorelli,A V Gritsan,S Scarfi,Y Han,Y Zhang,M Maity,A Yagil,G Kasieczka,J Lange,R Bucci,R Rossin,W Waltenberger,T C Herwig,T Niknejad,S Fiorendi,J P Chou,M Wayne,N Pastrone,M Mittal,O Gonzalez Lopez,J Schwandt,D Mason,R Kunnawalkam Elayavalli,C Riccardi,S Bhattacharya,L Mirabito,O Pooth,C Wang,A Levin,N Pervan,H Cheng,M Wolf,S Wieland,N Beni,A Kaur,C Baldenegro Barrera,J N Butler,W Johns,A Muhammad,L Marchese,S Kwan,J Hauser,P E Karchin,O Hindrichs,D Guerrero,R Heller,E Kuznetsova,S Dansana,J Bueghly,P S Hussain,E Clement,A Santoro,Z Zolkapli,B Fischer,D Hoang,R Ceccarelli,A Stahl,J Mousa,S An,S Han,S Van Putte,A Giammanco,K Stenson,M Pesaresi,P Masterson,T Janssen,J Milosevic,T Tuuva,V D Elvira,M R Kim,N Cavallo,R Saradhy,J Thieman,R Chawla,J Varela,D Noonan,R Tenchini,A Tarabini,L Vigilante,X Sun,M H Schmitt,M Meena,M De Palma,S Jindariani,I Evangelou,D Sperka,Z Ye,G M Chen,E Yigitbasi,L Hay,S Lee,F Glessgen,J Alison,V E Barnes,A Morton,B Ille,I Dumanoglu,J Molnar,W Zhang,J Nash,T Quast,A K Virdi,F Legger,P Vischia,C Florez,T Roy,M Burkart,S Higginbotham,A Lotfy,S Chatterjee,A Zucchetta,H Becerril Gonzalez,G Roland,G Rolandi,A.-M Lyon,N Dhingra,V Andreev,O Buchmuller,R Bellan,F Zhang,Q Ingram,A Lanaro,S Kyriacou,R 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doi:10.1103/physrevlett.131.262301

Abstract

Quasireal photons exchanged in relativistic heavy ion interactions are powerful probes of the gluonic structure of nuclei. The coherent J/ψ photoproduction cross section in ultraperipheral lead-lead collisions is measured as a function of photon-nucleus center-of-mass energies per nucleon (W_{γN}^{Pb}) over a wide range of 40<W_{γN}^{Pb}<400 GeV. Results are obtained using data at the nucleon-nucleon center-of-mass energy of 5.02TeV collected by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 1.52 nb^{-1}. The cross section is observed to rise rapidly at low W_{γN}^{Pb}, and plateau above W_{γN}^{Pb}≈40 GeV, up to 400 GeV, entering a new regime of small Bjorken-x (≈6×10^{-5}) gluons being probed in a heavy nucleus. The observed energy dependence is not predicted by current quantum chromodynamic models.

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