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We investigate the momentum transfer dependence of differential cross sections $dsigma/dt$ in diffractive electroproduction of heavy quarkonia on proton targets. Model predictions for $dsigma/dt$ within the light-front QCD dipole formalism are based on a realistic model for a proper correlation between the impact parameter $vec b$ of a collision and color dipole orientation $vec r$. We demonstrate a significance of $vec b-vec r$ correlation by comparing with a standard simplification $vec{b}parallelvec{r}$, frequently used in the literature.
We apply perturbative QCD to investigate the near threshold heavy quarkonium photoproduction at large momentum transfer. From an explicit calculation, we show that the conventional power counting method will be modified and the three quark Fock state
The process of exclusive electroproduction of vector quarkonium (EEQ), $e pto epV$, is per se an interesting topic in studies of quarkonium production mechanism, QCD description of diffractive interaction and nucleon structure. We investigate this pr
We study the transition of a heavy quark pair from octet to singlet color configurations at next-to-next-to-leading order (NNLO) in heavy quarkonium production. We show that the infrared singularities in this process are consistent with NRQCD factori
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 ta
We have extended the calculation of the correlation functions of heavy quarkonium hybrid operators with various $J^{PC}$ quantum numbers to include QCD condensates up to dimension six. In contrast to previous analyses which were unable to optimize th