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

Abstract: The cross section for coherent J/? 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 159?b?1, collected during the 2011 PbPb run. The J/? mesons are reconstructed in the dimuon decay channel, while neutrons are detected using zero degree calorimeters. The measured cross section is d?Xn0n coh/dy(J/?)=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 d?coh/dy(J/?)=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/? photoproduction in ?+Pb interactions. The data are found to be consistent with the leading twist approximation, which includes nuclear gluon shadowing.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Physics Letters B 772 (2017) 489-511

Editorial: Elsevier

 Fecha de publicación: 01/09/2017

Nº de páginas: 23

Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.physletb.2017.07.001

ISSN: 0370-2693,1873-2445

Url de la publicación: https://doi.org/10.1016/j.physletb.2017.07.001