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I discuss double-diffractive (double-elastic) production of the $\eta'$ and$\eta_c$ mesons in the $pp \to p X p$ reaction within the formalism ofunintegrated gluon distribution functions (UGDF). The contribution of $\gamma^*\gamma^* \to \eta'$ fusion is estimated. The distributions in the Feynman $x_F$(or rapidity), transferred four-momenta squared between initial and finalprotons ($t_1$, $t_2$) and azimuthal angle difference between outgoing protons($\Phi$) are calculated and discussed. The results are compared with the WA102data. Predictions at higher energies are presented.Comment: a talk presented at the international conference MESON2006, Cracow,  Poland, June, 2006; 5 pages, 3 figures, 1 tabl

DIFFRACTIVE DOUBLE-ELASTIC PRODUCTION OF η′ AND ηc IN THE pp → pXp REACTION

DIFFRACTIVE DOUBLE-ELASTIC PRODUCTION OF η′ AND η_c IN THE pp → pXp REACTION