Precision calculations for physics beyond the standard model
Mathieu Pellen, Margarete Mühlleitner, M. Krämer · RWTH Publications (RWTH Aachen) · 2015
As the standard model of particle physics does not account for several phenomena, it is mandatory to go beyond. Inparticular the hierarchy problem and the nature of dark matter are still unexplained. To test new theories, preciseand reliable predictions are required. This thesis is thus devoted to precision calculations for beyond the standard model theories. The Large Hadron collider (LHC) and astrophysics experiments offer opportunities to confirm or exclude beyond the standard model theories. Supersymmetry is one of the best motivated models of new physics and thus searching for it at the LHC is one of the main tasks of the experimental collaborations. Hence in the present work, the fully differential calculations of the decay of strongly interacting particles at next-to-leading order in supersymmetric QCD are presented. Different methods to combine production processes and decays at next-to-leading order are discussed. Using this, spin effects for processes involving gluinos are also inferred. Finally, a dark matter study examining several models in the context of indirect detection is presented. In particular, this study focuses on the role of electroweak corrections.