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A, Feofilov G, Ferencei J, Fernández Téllez A, Ferreiro EG, Ferretti A, Festanti A, Figiel J, Figueredo MAS, Filchagin S, Finogeev D, Fionda FM, Fiore EM, Floratos E, Floris M, Foertsch S, Foka P, Fokin S, Fragiacomo E, Francescon A, Frankenfeld U, Fuchs U, Furget C, Furs A, Fusco Girard M, Gaardhøje JJ, Gagliardi M, Gago AM, Gallio M, Gangadharan DR, Ganoti P, Gao C, Garabatos C, Garcia-Solis E, Gargiulo C, Garishvili I, Gerhard J, Germain M, Gheata A, Gheata M, Ghidini B, Ghosh P, Ghosh SK, Gianotti P, Giubellino P, Gladysz-Dziadus E, Glässel P, Gomez Ramirez A, González-Zamora P, Gorbunov S, Görlich L, Gotovac S, Graczykowski LK, Grelli A, Grigoras A, Grigoras C, Grigoriev V, Grigoryan A, Grigoryan S, Grinyov B, Grion N, Grosse-Oetringhaus JF, Grossiord JY, Grosso R, Guber F, Guernane R, Guerzoni B, Guilbaud M, Gulbrandsen K, Gulkanyan H, Gumbo M, Gunji T, Gupta A, Gupta R, Khan KH, Haake R, Haaland Ø, Hadjidakis C, Haiduc M, Hamagaki H, Hamar G, Hanratty LD, Hansen A, Harris JW, Hartmann H, Harton A, Hatzifotiadou D, Hayashi S, Heckel ST, Heide M, Helstrup H, Herghelegiu A, Herrera Corral G, Hess BA, Hetland KF, Hippolyte B, Hladky J, Hristov P, Huang M, Humanic TJ, Hussain N, Hutter D, Hwang DS, Ilkaev R, Ilkiv I, Inaba M, Innocenti GM, Ionita C, Ippolitov M, Irfan M, Ivanov M, Ivanov V, Jachołkowski A, Jacobs PM, Jahnke C, Jang HJ, Janik MA, Jayarathna PHSY, Jena C, Jena S, Jimenez Bustamante RT, Jones PG, Jung H, Jusko A, Kadyshevskiy V, Kalcher S, Kalinak P, Kalweit A, Kamin J, Kang JH, Kaplin V, Kar S, Karasu Uysal A, Karavichev O, Karavicheva T, Karpechev E, Kebschull U, Keidel R, Keijdener DLD, Keil Svn M, Khan MM, Khan P, Khan SA, Khanzadeev A, Kharlov Y, Kileng B, Kim B, Kim DW, Kim DJ, Kim JS, Kim M, Kim M, Kim S, Kim T, Kirsch S, Kisel I, Kiselev S, Kisiel A, Kiss G, Klay JL, Klein J, Klein-Bösing C, Kluge A, Knichel ML, Knospe AG, Kobdaj C, Kofarago M, Köhler MK, Kollegger T, Kolojvari A, Kondratiev V, Kondratyeva N, Konevskikh A, Kovalenko V, Kowalski M, Kox S, Koyithatta Meethaleveedu G, Kral J, Králik I, Kravčáková A, Krelina M, Kretz M, Krivda M, Krizek F, Kryshen E, Krzewicki M, Kučera V, Kucheriaev Y, Kugathasan T, Kuhn C, Kuijer PG, Kulakov I, Kumar J, Kurashvili P, Kurepin A, Kurepin AB, Kuryakin A, Kushpil S, Kweon MJ, Kwon Y, Ladron de Guevara P, Lagana Fernandes C, Lakomov I, Langoy R, Lara C, Lardeux A, Lattuca A, La Pointe SL, La Rocca P, Lea R, Leardini L, Lee GR, Legrand I, Lehnert J, Lemmon RC, Lenti V, Leogrande E, Leoncino M, León Monzón I, Lévai P, Li S, Lien J, Lietava R, Lindal S, Lindenstruth V, Lippmann C, Lisa MA, Ljunggren HM, Lodato DF, Loenne PI, Loggins VR, Loginov V, Lohner D, Loizides C, Lopez X, López Torres E, Lu XG, Luettig P, Lunardon M, Luparello G, Ma R, Maevskaya A, Mager M, Mahapatra DP, Mahmood SM, Maire A, Majka RD, Malaev M, Maldonado Cervantes I, Malinina L, Mal'Kevich D, Malzacher P, Mamonov A, Manceau L, Manko V, Manso F, Manzari V, Marchisone M, Mareš J, Margagliotti GV, Margotti 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A, Zimmermann MB, Zinovjev G, Zoccarato Y, Zyzak M. Exclusive J/ψ photoproduction off protons in ultraperipheral p-Pb collisions at √(s(NN))=5.02 TeV. PHYSICAL REVIEW LETTERS 2014; 113:232504. [PMID: 25526123 DOI: 10.1103/physrevlett.113.232504] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Indexed: 06/04/2023]
Abstract
We present the first measurement at the LHC of exclusive J/ψ photoproduction off protons, in ultraperipheral proton-lead collisions at sqrt[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 σ(γ+p→J/ψ+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 γp 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/ψ photoproduction cross section in γp energies from about 20 to 700 GeV, or equivalently, from Bjorken x scaling variable between ∼2×10^{-2} and ∼2×10^{-5}, thus indicating no significant change in the gluon density behavior of the proton between HERA and LHC energies.
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