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Abstract: We review two inter-related topics. First, we consider the behaviour of-soft- scattering observables, such as sigma {tot}, dsigma {el}-dt,dsigma {SD}-dtdM^2, particle multiplicities etc., at high-energyproton-antiproton colliders. We emphasize the sizeable effects of absorptionon high-energy `soft- processes, and, hence, the necessity to includemulti-Pomeron-Pomeron interactions in the usual multi-channel eikonaldescription. We describe a multi-component model which has been tuned to theavailable data for soft processes in the CERN-ISR to Tevatron energy range, andwhich therefore allows predictions to be made for `soft- observables at theLHC. The second topic concerns the calculation of the rate of exclusiveprocesses of the form pp -> p+A+p at high energy colliders, where A is a heavysystem. In particular, we discuss the survival probability of the rapidity gapsdenoted by the + signs to both eikonal and enhanced soft rescatteringeffects. At the LHC energy, the most topical case is when A is a Higgs boson.At the Tevatron, measurements have been made for the exclusive diffractiveproduction of various systems: A being either gamma-gamma, dijet, or a chi cmeson. We compare the observed rates with the expectations. Finally, wedescribe how predictions for exclusive processes may be checked in the earlyruns of the LHC.

Autor: A.D. Martin, M.G. Ryskin, V.A. Khoze


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