Z pole observables in the MSSM

We present the currently most accurate prediction of Z pole observables such as sin(2)theta(eff), Gamma(Z), R-b, R-l, and sigma(0)(had) in the Minimal Supersymmetric Standard Model (MSSM). We take into account the complete one-loop corrections as well as the full SM results. We furthermore include higher-order corrections in the MSSM Higgs boson sector, entering via virtual Higgs boson contributions. For Gamma(Z ->(chi) over tilde (0)(1)(chi) over tilde (0)(1)) we present a full one-loop calculation. We analyse the impact of the different sectors of the MSSM with particular emphasis on the effects of the complex phases. The predictons for the Z boson observables and M-W are compared with the current experimental values. Furthermore we provide and estimate of the remaining higher-order uncertainities in the prediction of sin(2)theta(eff).