| Abstract [eng] |
In order for a given theory to be predictive it is needed to renormalize it, i.e. write it in terms of measured quantities. For the most part, in this thesis we discuss the conceptual and tehcnical aspects of renormalization in the presence of particle mixing. Importantly, we show that mixing matrix counterterms should be trivial, construct a renormalization scheme, where this is the case, extend it to all orders in perturbation theory, and apply it to the Grimus-Neufeld model at 1-loop level. Another significant part of the thesis is concerned with the renormalization of the electroweak sector in terms of oblique parameters, once the custodial symmetry is broken at tree-level. In this part we additionally renormalize the W boson mass in order to remove a divergent parameter, while this leads to genuine oblique parameter formalism it also shows the limits of applying the oblique parameters. |
