Radiatively Corrected Bound on the Light Higgs Mass in a Minimal Non Minimal Supersymmetric Standard Model

Abstract

The neutral Higgs sector of the Minimal non Minimal Supersymmetric Standard Model is considered. By effective potential and R.G.E. supported method; an upper bound of the lightest Higgs is analysed. From the request of perturbativity of the coupling in the superpotential, adding the leading stop top contributions, the absolute bound of $\sim 130$ GeV for $90GeV<m_t<180GeV$ and $M_{\tilde{t}}\simeq 1000$ GeV is derived. The interesting dependence on $m_t$ for $\tan \beta \to 1$ is discussed .