Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experiment

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dc.citation.firstpage489en_US
dc.citation.journalTitlePhysics Letters Ben_US
dc.citation.lastpage511en_US
dc.citation.volumeNumber772en_US
dc.contributor.authorCMS Collaborationen_US
dc.date.accessioned2018-11-29T21:17:49Zen_US
dc.date.available2018-11-29T21:17:49Zen_US
dc.date.issued2017en_US
dc.description.abstractThe cross section for coherent J/ψ photoproduction accompanied by at least one neutron on one side of the interaction point and no neutron activity on the other side, Xn0n, is measured with the CMS experiment in ultra-peripheral PbPb collisions at sNN=2.76TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 159μb−1, collected during the 2011 PbPb run. The J/ψ mesons are reconstructed in the dimuon decay channel, while neutrons are detected using zero degree calorimeters. The measured cross section is dσXn0ncoh/dy(J/ψ)=0.36±0.04(stat)±0.04(syst) mb in the rapidity interval 1.8<|y|<2.3. Using a model for the relative rate of coherent photoproduction processes, this Xn0n measurement gives a total coherent photoproduction cross section of dσcoh/dy(J/ψ)=1.82±0.22(stat)±0.20(syst)±0.19(theo) mb. The data strongly disfavor the impulse approximation model prediction, indicating that nuclear effects are needed to describe coherent J/ψ photoproduction in γ+Pb interactions. The data are found to be consistent with the leading twist approximation, which includes nuclear gluon shadowing.en_US
dc.identifier.citationCMS Collaboration. "Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experiment." <i>Physics Letters B,</i> 772, (2017) Elsevier: 489-511. https://doi.org/10.1016/j.physletb.2017.07.001.en_US
dc.identifier.doihttps://doi.org/10.1016/j.physletb.2017.07.001en_US
dc.identifier.urihttps://hdl.handle.net/1911/103487en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.rightsThis is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.subject.keywordCMSen_US
dc.subject.keywordPhysicsen_US
dc.subject.keywordHeavy ion collisionsen_US
dc.subject.keywordUltra-peripheral collisionsen_US
dc.subject.keywordUPCen_US
dc.subject.keywordJ/Psien_US
dc.titleCoherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experimenten_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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