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Recent results for the leading $\mathcal{O}{\left(\alpha_t^2\right)}$two-loop corrections to the Higgs-boson masses of the MSSM with complexparameters are presented. The strategy of the Feynman-diagrammatic, analyticalcalculation is illustrated. Numerical analyses show agreement with a previousresult in the limit of real parameters. Furthermore, the newly availabledependence on complex MSSM parameters is investigated. Mass shifts by $\approx1$GeV for different phases underline the importance of this contribution for aprecise prediction of the Higgs-boson mass spectrum in the MSSM.

Top Yukawa-Coupling Enhanced Two-Loop Corrections to the Masses of the Higgs Bosons in the MSSM with CP Violation