Quasi Yukawa Fixed Point due to Decoupling of SUSY Particles

Details Quasi Yukawa Fixed Point due to Decoupling of SUSY Particles Quasi Yukawa Fixed Point due to Decoupling of SUSY Particles

1996-01-30

arxiv.org/abs/hep-ph/9601374v2

Phys.Lett. B381 (1996) 169-176

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 13 pages, 3 figures, To appear in Phys. Lett. B

Scientific paper

10.1016/0370-2693(96)00598-9

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 $M_S$ is large ($\simg 1$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 $M_S\siml 1$TeV, the decoupling of gluinos lowers $m_t^{\rm QFP}$. 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 rather large initial top Yukawa coupling is realized by underlying theory.

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