Abstract
I discuss double-diffractive (double-elastic) production of the η′ and ηc mesons in the pp → pXp reaction within the formalism of unintegrated gluon distribution functions (UGDF). The contribution of γ*γ* → η′ fusion is estimated. The distributions in the Feynman xF (or rapidity), transferred four-momenta squared between initial and final protons (t1, t2) and azimuthal angle difference between outgoing protons (Φ) are calculated and discussed. The results are compared with the WA102 data. Predictions at higher energies are presented.
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