Pomeron universality from identical pion correlations
  Bose-Einstein correlations of identical pions produced in high-energy pp collisions at the LHC allow a probe of the Pomeron exchange mechanism. The size of the domain which emits the pions depends on the multiplicity of events, but not on the collider energy. This confirms the universal structure of Pomeron exchange. The data at relatively low multiplicities indicate that the size of the source created by one-Pomeron exchange is much less than the size of the proton. 
V.A. Schegelsky, A.D. Martin, M.G. Ryskin and V.A. Khoze
hep-ph