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We present the first study of coherent exclusive quarkonium ($J/\psi$,$\Upsilon$) photoproduction in ultraperipheral nucleus-nucleus collisions(UPCs) at the LHC in the framework of collinear factorization andnext-to-leading order (NLO) perturbative QCD (pQCD). We make NLO predictionsfor the $J/\psi$ and $\Upsilon$ rapidity distributions for lead (Pb) and oxygen(O) beams, and quantify their dependence on the factorization/renormalizationscale, nuclear parton distribution functions (PDFs) and their uncertainties,and on differences between nuclear PDFs and generalized parton distributionfunctions (GPDs). We show that within the PDF-originating uncertainties ourapproach provides a good description of the available $J/\psi$ photoproductiondata in Pb+Pb UPCs at the LHC but that the scale uncertainty is significant. Wedemonstrate that at NLO pQCD the quark contributions are important in the$J/\psi$ case but that gluons clearly dominate the $\Upsilon$ cross sections.We also study how the scale dependence could be tamed by considering O+O/Pb+Pbratios of the exclusive $J/\psi$ UPC cross sections, and how HERA and p+p/PbLHC data can help in obtaining better-controlled NLO predictions in the$\Upsilon$ case.

Exclusive quarkonium photoproduction in $A$+$A$ UPCs at the LHC in NLO pQCD