Effective cross section and spatial structure of the hadrons
  Informations about the spatial structure of parton distribution within the hadron are provided by the ratios between the inclusive cross sections for a pair of jets, two pairs of jets, three pairs of jets..., and so on. It results, however that these ratios depend not only on the spatial distribution but also, and even more, on the multiplicity distribution of the initial partons. 
Giorgio Calucci and Marco Dazzi Giorgio Calucci and Marco Dazzi