Abstract

We summarize the discussions on the value of the survival probabilities of the large rapidity gap processes at Durham Workshop '98. When we calculate the cross sections with a large rapidity gap (LRG) such as the diffractive (double diffractive (DD)) processes or two jet production with a LRG between them, we have to estimate the probability that the rapidity gap corresponding to the pomeron exchange will not be filled by secondaries from the scattering of spectator partons or from the decay of bremsstrahlung gluons. This survival probability hS 2 i < 1 depends on the kinematics of each specific process and may violate factorization (even for the cases where the factorization properties of diffractive amplitudes are satisfied at the initial stage). To demonstrate the role of bremsstrahlung emission let us consider the exclusive Higgs boson DD production pp! p + (LRG) + H + (LRG) + p

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