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dc.contributor.authorAbelev, Bettyeng
dc.contributor.authorAdam, Jaroslaveng
dc.contributor.authorAdamová, Dagmareng
dc.contributor.authorAggarwal, Madan M.eng
dc.contributor.authorAglieri Rinella, Gianlucaeng
dc.contributor.authorAgnello, Michelangeloeng
dc.contributor.authorAgostinelli, Andreaeng
dc.contributor.authorAgrawal, Nikitaeng
dc.contributor.authorAhmad, Nazeereng
dc.contributor.authorAhn, Sang Uneng
dc.contributor.authorAlme, Johaneng
dc.contributor.authorErdal, Hege Austrheimeng
dc.contributor.authorHelstrup, Håvardeng
dc.contributor.authorHetland, Kristin Fanebusteng
dc.contributor.authorKileng, Bjarteeng
dc.contributor.authorAltinpinar, Sedateng
dc.contributor.authorDjuvsland, Øysteineng
dc.contributor.authorFehlker, Dominikeng
dc.contributor.authorHaaland, Øystein Senneseteng
dc.contributor.authorHuang, Meidanaeng
dc.contributor.authorLønne, Per-Ivareng
dc.contributor.authorNystrand, Joakimeng
dc.contributor.authorRehman, Attiq ureng
dc.contributor.authorRøhrich, Dietereng
dc.contributor.authorSkjerdal, Kyrreeng
dc.contributor.authorUllaland, Kjetileng
dc.contributor.authorVelure, Arildeng
dc.contributor.authorWagner, Boriseng
dc.contributor.authorYang, Shimingeng
dc.contributor.authorZhou, Zhuoeng
dc.contributor.authorArsene, Ionut Christianeng
dc.contributor.authorBätzing, Paul Christopheng
dc.contributor.authorDordic, Oljaeng
dc.contributor.authorLindal, Sveineng
dc.contributor.authorMahmood, Sohail Musaeng
dc.contributor.authorMilosevic, Jovaneng
dc.contributor.authorQvigstad, Henrikeng
dc.contributor.authorRichter, Matthiaseng
dc.contributor.authorRøed, Ketileng
dc.contributor.authorSkaali, Toralf Bernhardeng
dc.contributor.authorTveter, Trine Spedstadeng
dc.contributor.authorWikne, Jon Christophereng
dc.contributor.authorZhao, Chengxineng
dc.contributor.authorLangøy, Runeeng
dc.contributor.authorLien, Jørgen Andréeng
dc.contributor.authorAhn, Sul-Aheng
dc.contributor.authorAjaz, Muhammadeng
dc.contributor.authorAkindinov, Alexandereng
dc.contributor.authorAleksandrov, Dimitryeng
dc.contributor.authorAlessandro, Brunoeng
dc.contributor.authorALICE, Collaborationeng
dc.date.accessioned2015-05-15T11:33:01Z
dc.date.available2015-05-15T11:33:01Z
dc.date.issued2014-12-05eng
dc.identifier.issn0031-9007en_US
dc.identifier.urihttps://hdl.handle.net/1956/9883
dc.description.abstractWe present the first measurement at the LHC of exclusive J/ψ photoproduction off protons, in ultraperipheral proton-lead collisions at √sNN=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)+27−32(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.en_US
dc.language.isoengeng
dc.publisherAmerican Physical Societyen_US
dc.rightsAttribution CC BYeng
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/eng
dc.titleExclusive J /ψ photoproduction off protons in ultraperipheral p-Pb collisions at √sNN = 5.02TeVen_US
dc.typePeer reviewed
dc.typeJournal article
dc.date.updated2015-04-09T06:40:26Zen_US
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2014 CERN, for the The ALICE Collaborationen_US
dc.source.articlenumber232504
dc.identifier.doihttps://doi.org/10.1103/physrevlett.113.232504
dc.identifier.cristin1204182
dc.source.journalPhysical Review Letters
dc.source.40113
dc.source.1423
dc.subject.nsiVDP::Mathematics and natural scienses: 400::Physics: 430::Nuclear and elementary particle physics: 431en_US
dc.subject.nsiVDP::Matematikk og naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431nob


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