Refinements of the Bottom and Strange MSSM Higgs Yukawa Couplings at NNLO
Abstract
We extend the already existing two-loop calculation of the effective bottom-Yukawa coupling in the MSSM. In addition to the resummation of the dominant corrections for large values of tgβ, we include the subleading terms related to the trilinear Higgs coupling Ab and contributions induced by the electroweak gauge couplings. This calculation has been extended to the NNLO corrections to the MSSM strange-Yukawa coupling. Our analysis leads to residual theoretical uncertainties of the effective Yukawa couplings at the per-cent level.
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