Diffractive Interactions in ep Collisions
  The H1 and ZEUS experiments are measuring diffractive interactions in ep collisions at HERA. Performing QCD fits of these data with NLO DGLAP, diffractive parton distribution functions can be calculated. These diffractive PDFs can be used to test QCD factorisation with dijet and charm data. 
Isabell-Alissandra Melzer-Pellmann