Testing the minimal supersymmetric standard model with the mass of the W boson

We review the currently most accurate evaluation of the W boson mass, M W , in the minimal supersymmetric standard model (MSSM). It consists of a full one-loop calculation, including the complex phase dependence, all available MSSM two-loop corrections as well as the full standard model result. We analyse the impact of the phases in the scalar quark sector on M W and compare the prediction for M W based on all known higher-order contributions with the experimental results.