Abstract
The effective bottom Yukawa couplings are analyzed for the minimal supersymmetric extension of the Standard Model at two-loop accuracy within SUSY-QCD. They include the resummation of the dominant corrections for large values of tgβ. In particular the two-loop SUSY-QCD corrections to the leading SUSY-QCD and top-induced SUSYelectroweak contributions are addressed. The residual theoretical uncertainties range at the per-cent level.
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