2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/104523Our presentation centers on the consequences of s-channel unitarity, manifested by soft re-scatterings of the spectator partons in a high energy diffractive process, focusing on the calculations of gap survival probabilities. Our emphasis is on recent estimates relevant to exclusive diffractive Higgs production at the LHC. To this end, we critically re-examine the comparison of the theoretical estimates of large rapidity gap hard di-jets with the measured data, and remark on the difficulties in the interpretation of HERA hard di-jet photoproduction.Prepared for the HERA and the LHC CERN/DESY workshop 2004/2005High Energy Physics - Phenomenologytext