Electroweak physics constitutes an invaluable means of testing the Standard Model and any of its extensions. The currently most accurate and most general evaluations of the W boson mass and the Z pole observables in the Minimal Supersymmetric Standard Model (MSSM) are presented in this thesis. The predictions of both W mass and Z pole observables show a strong sensitivity on Beyond-Standard-Model physics via quantum corrections and thus help to identify the possible mass scales of supersymmetric particles. In a second step, global fits and forecasts are performed in the constrained MSSM (CMSSM). These analyses not only contain constraints from electroweak physics, but also from B physics and the observed value of the dark matter relic density. Altogether, the results of the numerical analyses in this thesis bode well for a SUSY and Higgs discovery at future colliders.
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