Pomeron Non Factorization in Diffractive Scattering at HERA
  Pomeron non factorization for the diffractive scattering is considered and an analysis of experimental data is performed with different cuts in the momentum fraction $\xi$. The results of the analysis are compared with the breaking predicted in the Genovese-Nikolaev-Zakharov model. 
R. Fiore, A. Flachi, L.L. Jenkovszky, F. Paccanoni