English Intern
  • Seminar Elementarteilchenphysik
Theoretische Physik II

MSc. Marten Berger

Universität Hamburg

T a l k : 14. July 2022

Constraining BSM models using high precision observables


The high experimental accuracy of the W boson mass, MW , measurement provides a powerful tool to test the theory and differentiate between models. One of the best motivated extensions of the Standard Model (SM) is the Minimal Supersymmetric Standard Model (MSSM). The electroweak precision observables such as MW are highly sensitive to loop contributions of the new physics introduced by the MSSM. Therefore the precise experimental accuracy can be used to narrow down the allowed parameter space of the MSSM.
In this talk we discuss the theory prediction for MW within the SM and the MSSM, focusing on the impact of the one-loop supersymmetry (SUSY) contributions. Furthermore we discuss in detail the contributions arising from one-loop gauge self-energy diagrams containing sleptons, that have shown, prior to this study, a rapid increase to the shift of the W boson mass, δMW , when ME > ML are chosen as input parameters. For this we present a new standalone code, that includes all known higher-order corrections of SM and SUSY type and a corrected one-loop slepton contribution.