Low-energy observables and fine-tuning in the MSSM: one convention to rule them all
Abstract
Elementary particles such as electrons and muons have interesting fundamental properties, that allow us to study the Standard Model of Particle Physics and its possible extensions. By connecting experiments at low and high energies, we aim to get more insight in Beyond the Standard Model physics. Ultimately we search for a model that also explains the different phenomena in our Universe, such as Dark Matter. Through something called fine-tuning we also define a measure for the likeliness of a new model, as the different parameters and observables cannot be too fine-tuned.
First, we study a model that provides a Dark Matter candidate and at the same time explains the anomalous magnetic moment of the muon, while still having low fine-tuning solutions. We also find that while current experimental limits are satisfied, experiments in the near future with either exclude all of our solutions, or indicate which model is likely to extend the Standard Model. This makes it a very interesting model to study!
Next we study a new model, that allows the electron electric dipole moment to differ from the Standard Model value. Again, we require a suitable Dark Matter candidate and study its properties, within the limitations of the available software. Furthermore we develop a finetuning measure suitable for this model. The first results are promising: solutions with low fine-tuning are definitely possible!
Finally we propose how to improve and extend the software to study this model in more detail, allowing for a fuller understanding of its properties.