Rapidity gap survival probability and total cross sections
  We discuss recent calculations of the survival probability of the large rapidity gaps in exclusive processes of the type pp --> p+A+p at high energies. Absorptive or screening effects are important, and one consequence is that the total cross section at the LHC is predicted to be only about 90 mb. 
A.D. Martin, V.A. Khoze and M.G. Ryskin