Precision calculations within the Standard Model offer the possibility to indirectly search for the existence of new physics. In the flavour physics sector there are emerging tensions that must be further scrutinised, e.g. for determinations of the light-quark Cabibbo-Kobayashi-Maskawa matrix elements through various hadron decays. These decays require good control of the non-perturbative...
In the realm of higher-dimensional grand unified theories (GUTs), the technique of orbifolding has emerged as a powerful tool to achieve spontaneous symmetry breaking by geometrical means. We use this tool to analyze the most general 5D GUT models based on the gauge groups SU(N), Sp(2N) and SO(N). We find a new physical consistency requirement, which these models have to satisfy in order to be...
Since some 70 years, the default method of calculating scattering amplitudes is to use Feynman diagrams. In this talk, I will explore how standard Feynman rules can be significantly simplified by breaking up the Lorentz structure of spin and momentum into smaller objects, the left and right spinors. Adapting the method of color flow from the strong force, I show how amplitudes corresponding to...
