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I discuss exclusive production of the $\eta'$, $J/\psi$, and $\chi_c(0^+)$mesons in $pp$ and $p \bar p$ collisions at high energies. QCD diffractivemechanisms as well as nondiffractive mechanisms are discussed. Differentunintegrated gluon distribution functions (UGDF) are used. Some differentialdistributions are shown and discussed.

Exclusive Production of Quarkonia in $pp$ and $p \bar p$ Collisions Far from the Threshold