Two-loop contributions to electroweak precision observables in the MSSM
Abstract
The evaluation of the two-loop MSSM-contributions to the electroweak precision observables MW and sweff at order(alphat2), order(alphat alphab), order(alphab2) is presented. These contributions enter via Delta(rho), and it is explained in detail how one can retain the true, non-vanishing value of the MSSM Higgs boson mass Mh in spite of using the gauge-less limit in the calculation. The numerical results can be sizeable, in particular for strong squark mixing. By comparing the results in the on-shell and DR-bar renormalization schemes, the remaining theoretical uncertainty is found to be small.
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