Exclusive \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\text{ J }/\psi }$$\end{document}J/ψ production in ultraperipheral collisions at the LHC: constraints on the gluon distributions in the proton and nuclei