Total photoproduction cross-section at very high energy
  In this paper we apply to photoproduction total cross-section a model we have proposed for purely hadronic processes and which is based on QCD mini-jets and soft gluon re-summation. We compare the predictions of our model with the HERA data as well as with other models. For cosmic rays, our model predicts substantially higher cross-sections at TeV energies than models based on factorization but lower than models based on mini-jets alone, without soft gluons. We discuss the origin of this difference. 
R.M. Godbole (Bangalore, India), A Grau (Granada, Spain), G. Pancheri   (INFN Frascati), Y.N. Srivastava (Perugia, Italy)