THE ABSOLUTE UPPER BOUND ON THE 1-LOOP CORRECTED MASS OF THE LIGHTESTSCALAR HIGGS-BOSON IN THE NEXT-TO-MINIMAL SUPERSYMMETRIC STANDARD MODEL

We examine in detail radiative corrections to the lightest scalar Higg s boson mass due to the top-quark and top-scalar-quark, loops in the n ext-to-minimal supersymmetric standard model (NMSSM). In our analysis, the mass matrix of the top-scalar-quark contains terms proportional t o the gauge couplings. Therefore, our formula for the scalar Higgs bos on mass matrix at the 1-loop level partially includes the gauge boson contributions. Thus we calculate the upper bound on the lightest scala r Higgs boson mass without the gauge terms as well as with the gauge t erms in the top-scalar-quark masses. The upper bound on the lightest s calar Higgs boson mass can be increased by about 20 GeV by the inclusi on of terms proportional to the gauge couplings in the top-scalar quar k masses. we find that the absolute upper bound on the 1-loop correcte d mass of the lightest scalar Higgs boson partially including the gaug e boson contributions is about 156 GeV.