On the test of Pomeron structure (parton distribution functions)

The contributions of the double Pomeron exchange to the J/ψ production in high energy p + p(p-bar) collisions are calculated using different models for parton distribution functions inside the Pomeron(P). For the Ingelman-Schlein model in which gluons dominate in partons, the cross sections in high energy increase smoothly with √S as 1n2S or 1nS. The total cross section σ(S) is about 102-103nb in the TeV energies. For the Donnachie-Landshoff model in which the P are considered as something like isoscalar photons with C = +1 the cross section behavior increasing with energy √S is a little bit complicated. In same energy range, the cross sections are only 1-3 nb which are smaller than that of the former case by 2-3 order of magnitude. So, if we assume the parameters of the above models are reliable, then these J/ψ production processes should be a good place for testing these models