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In this paper, we study fully differential quarkonia photoproductionobservables in ultraperipheral collisions (UPCs) as functions of momentumtransfer squared. We employ the dipole picture of the QCD part of thescattering with proton and nucleus targets, with the projectile being aquasi-real photon flux emitted by an incoming hadron. We analyse suchobservables for ground $J/\psi$, $\Upsilon(1S)$ and excited $\psi'$,$\Upsilon(2S)$ states whose light-front wave functions are obtained in theframework of interquark potential model incorporating the Melosh spintransformation. Two different low-$x$ saturation models, one obtained bysolving the Balitsky--Kovchegov equation with the collinearly improved kerneland the other with a Gaussian impact-parameter dependent profile, are used toestimate the underlined theoretical uncertainties of our calculations. Theresults for the proton target and with charmonium in the final state are inagreement with the available HERA data, while in the case of nucleus target wemake predictions for $\gamma A$ and $AA$ differential cross sections atdifferent $W$ and at $\sqrt{s}=5.02$ TeV, respectively.

Momentum transfer squared dependence of exclusive quarkonia photoproduction in UPCs