Electroweak Processes in the Standard Model and Beyond: Backgrounds to Higgs Physics and Semileptonic Decay Modes

This thesis describes several aspects of electroweak processes at the Large Hadron Collider. In the first part an analysis of supersymmetry induced backgrounds to the production of a SM-like Higgs boson in the MSSM is performed. The possible influence of BSM effects on the data-driven determination of non-BSM backgrounds is discussed in the second part of this thesis. Finally, the implementation of semileptonic decay modes for processes involving several electroweak gauge bosons is discussed.