Diffractive Double-Elastic Production of $\eta$' and ${\eta }_c$ in the $pp\to pXp$ Reaction

Abstract

I discuss double-diffractive (double-elastic) production of the ${\eta }^{\prime }$ and ${\eta }_c$ mesons in the $pp\to pXp$ reaction within the formalism of unintegrated gluon distribution functions (UGDF). The contribution of ${\gamma }^{\ast }{\gamma }^{\ast }\to {\eta }^{\prime }$ fusion is estimated. The distributions in the Feynman $x_F$ (or rapidity), transferred four-momenta squared between initial and final protons ($t_1$, $t_2$) and azimuthal angle difference between outgoing protons ($\Phi$) are calculated and discussed. The results are compared with the WA102 data. Predictions at higher energies are presented.

Comments: a talk presented at the international conference MESON2006, Cracow, Poland, June, 2006; 5 pages, 3 figures, 1 table