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

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dc.citation.firstpage489
dc.citation.journalTitlePhysics Letters B
dc.citation.lastpage511
dc.citation.volumeNumber772
dc.contributor.authorCMS Collaboration
dc.date.accessioned2018-11-29T21:17:49Z
dc.date.available2018-11-29T21:17:49Z
dc.date.issued2017
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.
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.
dc.identifier.doihttps://doi.org/10.1016/j.physletb.2017.07.001
dc.identifier.urihttps://hdl.handle.net/1911/103487
dc.language.isoeng
dc.publisherElsevier
dc.rightsThis is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject.keywordCMS
dc.subject.keywordPhysics
dc.subject.keywordHeavy ion collisions
dc.subject.keywordUltra-peripheral collisions
dc.subject.keywordUPC
dc.subject.keywordJ/Psi
dc.titleCoherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experiment
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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