We study μ and B-parameters in the minimal supersymmetric standard model (MSSM) based on the radiative electroweak symmetry breaking scenario using “bottom-up” approach and show how useful our approach is to select a phenomenologically viable model beyond the MSSM under the assumption that the underlying theory is a string model or a gauge-Yukawa unified gauge model. e-mail: [email protected]...

In the Minimal Supersymmetric Standard Model (MSSM), the process e+e− → g̃g̃ is mediated by quark/squark loops, dominantly of the third generation, where the mixing of leftand right-handed states can become large. Taking into account realistic beam polarization effects, photon and Z0-boson exchange, and current mass exclusion limits, we scan the MSSM parameter space for various e+e− center-of-mas...

We study the naturalness of electroweak symmetry breaking and baryogenesis in the next-to-minimal supersymmetric standard model (NMSSM). Our study is motivated by the recent LEP bounds on the Higgs boson mass which severely constrains the low tan β region of the minimal supersymmetric standard model (MSSM). We show that the low tanβ region of the NMSSM is clearly favoured over the MSSM with reg...