Radiative symmetry breaking and Higgs mass bound in the NMSSM

We study the mass upper bound of the lightest neutral Higgs scalar in the next to minimal supersymmetric standard model (NMSSM) using RGE analysis. We require electroweak radiative symmetry breaking in order to restrict the parameter space. As a result, the mass upper bound m(h)o is severely constrained compared with that calculated without imposing this condition. We point out some features bf m(h)o related to the initial value of h(t) and discuss why models with more extra matter fields 5 + (5) over bar of SU(5) yield larger maximum value of m(h)o.