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dc.contributor.authorKhachatryan, V.
dc.contributor.authorSirunyan, A. M.
dc.contributor.authorBaarmand, Marc M.
dc.contributor.authorBhopatkar, Vallary
dc.contributor.authorColafranceschi, Stefano
dc.contributor.authorHohlmann, Marcus
dc.contributor.authorKalakhety, H.
dc.contributor.authorNoonan, Daniel
dc.contributor.authorRoy, Tuhin S.
dc.contributor.authorYumiceva, F.
dc.date.accessioned2018-04-11T17:54:10Z
dc.date.available2018-04-11T17:54:10Z
dc.date.issued2017-09-10
dc.identifier.citationKhachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., . . . Woods, N. (2017). Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experiment. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 772, 489-511. 10.1016/j.physletb.2017.07.001en_US
dc.identifier.urihttp://hdl.handle.net/11141/2386
dc.descriptionCMS, Heavy ion collisions, J/Psi, Physics, Ultra-peripheral collisions, UPC, photoproductionen_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 dσXn0n coh/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.language.isoen_USen_US
dc.rights© 2017 the authorsen_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleCoherent J/ψ photoproduction in ultra-peripheral PbPb collisions at sNN=2.76TeV with the CMS experimenten_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.physletb.2017.07.001


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