Pomeron fusion and central η and η′ meson production

The contribution of pomeron fusion to the cross section of η and η′ productions in double-diffractive scattering has been calculated within the Donnachie-Landshoff model of pomeron. It is shown that the double pomeron exchange mechanism does not explain the full set of the recent data of WA102 Collaboration, though it might not be inconsistent with η′ productions.