Two-Loop Corrections to the Charged Higgs-Boson Mass in the MSSM

We review the numerical effects of the leading two-loop corrections to the mass of the charged Higgs boson, MH±, in the MSSM. They consist of the contributions of O(αtαs) and are calculated in the Feynman-diagrammatic approach. In the numerical analysis we investigate the variation of MH± as a function of MA, tanβ and the Higgs mixing parameter μ. The two-loop corrections can change MH± up to 5 GeV for positive values μ and large tanβ.