Nonlinear Evolution in High Energy QCD

Abstract: QCD at very high energies is still not very well understood. Difficulties arise from a strong non-linear dynamics and also from nonperturbative physics. Detailed analytic calculations are often only possible either for simple toy models, or for asymptotically high energies. In this thesis we investigate the high energy dynamics, with the goal of finding a realistic, working model for high energy QCD. We develop a phenomenological model based on the QCD dipole formalism. The model includes contributions both from saturation and unitarisation, and also from non-leading effects such as energy conservation and running coupling. The model is implemented in a Monte Carlo simulation, and is able to reproduce data from high energy processes relevant for the LHC.