Next-to-leading order perturbative QCD predictions for exclusive J/ photoproduction in oxygen-oxygen and lead-lead collisions at energies available at the CERN Large Hadron Collider

We present predictions for the cross sections of coherent J/psi photoproduction in lead-lead and oxygen -oxygen ultraperipheral collisions (UPCs) as a function of the J/psi rapidity at the LHC in the framework of collinear factorization at next-to-leading order (NLO) in perturbative QCD. Taking generalized parton distribu-tion functions in their forward limit and using the EPPS21, nNNPDF3.0, and nCTEQ15WZSIH nuclear parton distribution functions, we update our recent results for Pb-Pb collisions, make detailed predictions for O-O collisions for several beam energy configurations, and examine the ratio of O-O and Pb-Pb UPC cross sections. We show that the latter observable allows one to significantly reduce the scale uncertainty of NLO predictions for this process.