Abstract
In the Minimal Supersymmetric Standard Model (MSSM) we incorporate the Higgs-boson propagator corrections, evaluated up to two-loop order, into the prediction of the cross sections for the Higgs boson production mechanism, e + e − → hZ, hA, and into the evaluation of Higgs decay rates and branching ratios, Γ(h → f f ) and BR(h → f f ) for f = b, τ. The propagator corrections consist of the full one-loop contribution, including the effects of non-vanishing external momemntum, and at the two-loop level of the dominant corrections of O(αα s) and further sub-dominant contributions. The results are supplemented with one-loop vertex and box corrections. The effects of the two-loop propagator corrections and of specific one-loop contributions are investigated in detail. Our results are compared with the result obtained within the renormalization group approach. Agreement within O(10%) is found for most parts of the MSSM parameter space.
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