Momentum transfer squared dependence of exclusive quarkonia photoproduction in UPCs

Abstract

In this paper, we study fully differential quarkonia photoproduction observables in ultraperipheral collisions (UPCs) as functions of momentum transfer squared. We employ the dipole picture of the QCD part of the scattering with proton and nucleus targets, with the projectile being a quasi-real photon flux emitted by an incoming hadron. We analyse such observables for ground $J/\psi$, ${\rm Y}(1S)$ and excited ${\psi }^{\prime }$, ${\rm Y}(2S)$ states whose light-front wave functions are obtained in the framework of interquark potential model incorporating the Melosh spin transformation. Two different low-$x$ saturation models, one obtained by solving the Balitsky--Kovchegov equation with the collinearly improved kernel and the other with a Gaussian impact-parameter dependent profile, are used to estimate the underlined theoretical uncertainties of our calculations. The results for the proton target and with charmonium in the final state are in agreement with the available HERA data, while in the case of nucleus target we make predictions for $\gamma A$ and $AA$ differential cross sections at different $W$ and at $\sqrt{s}=5.02$ TeV, respectively.

arXiv comment20 pages, 9 figures, to be published in PRD

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Cited by in corpus (5)

• Unintegrated gluon distributions from the color dipole cross section in the BGK saturation model
• Asymptotic gluon density within the color dipole picture in the light of HERA high-precision data
• Exclusive photo- and electroproduction of excited light vector mesons via holographic model
• Testing the double-logarithm asymptotic gluon density in ultraperipheral heavy ion collisions at the Large Hadron Collider
• Coherent photoproduction of light vector mesons off nuclear targets in the dipole picture