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Publikācija: Coherent J/ψ Photoproduction in Ultra-Peripheral PbPb Collisions at √sNN = 2.76TeV with the CMS Experiment

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Nosaukums oriģinālvalodā Coherent J/ψ Photoproduction in Ultra-Peripheral PbPb Collisions at √sNN = 2.76TeV with the CMS Experiment
Pētniecības nozare 1. Dabaszinātnes
Pētniecības apakšnozare 1.3. Fizika un astronomija
Autori CERN international group of authors
Viesturs Veckalns
Atslēgas vārdi CMS, Heavy ion collisions, J/Psi, Physics, Ultra-peripheral collisions, UPC
Anotācija The 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, X n 0 n , is measured with the CMS experiment in ultra-peripheral PbPb collisions at s NN =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 dσ X n 0 n 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 X n 0 n measurement gives a total coherent photoproduction cross section of dσ coh /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.
DOI: 10.1016/j.physletb.2017.07.001
Hipersaite: https://www.sciencedirect.com/science/article/pii/S0370269317305488?via%3Dihub 
Atsauce international group of authors, C., Veckalns, V. 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, 2017, Vol.772, 489.-511.lpp. ISSN 0370-2693. Pieejams: doi:10.1016/j.physletb.2017.07.001
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