Quasi Yukawa fixed point due to decoupling of SUSY particles

We study effects of SUSY particle decouplings on a quasi fixed point (QFP) of Yukawa coupling. From renormalization group analysis it is shown that if the SUSY breaking scale Ms is large (≳ 1 TeV), effects of decoupling of Higgsinos and squarks raise the top Yukawa QFP. This tendency is enhanced in most cases of non-universal SUSY breaking. For the case of Ms ≲ 1 TeV, the decoupling of gluinos lowers mtQFP. We checked some parameter dependencies for the top Yukawa QFP. The bottom-top Yukawa unified case is also studied. When top quark mass is measured more precisely, some patterns of soft mass spectra could be excluded if a rather large initial top Yukawa coupling is realized by the underlying theory.