We derive analytic formulas for the radiatively corrected mass of the scalar Higgs boson in the framework of the minimal supersymmetric standard model (MSSM). Since the scalar-top-quark mass in our analysis include terms proportional to the gauge couplings

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aThegaugebosoncontributionstotheradiativelycorrectedmassofthescalarHiggsbosonintheminimalsupersymmetricstandardmodelSeungWooHamandSunKunOhDepartmentofPhysics,Kon-KukUniversity,Seoul143-701,KoreaBjongRoKimIII.Physikalisches.Institut.A,RWTHAachen,D52056Aachen,GermanyAbstractWederiveanalyticformulasfortheradiativelycorrectedmassofthescalarHiggsbosonintheframeworkoftheminimalsupersymmetricstandardmodel(MSSM).Sincethescalar-top-quarkmassinouranalysisincludetermspropor-tionaltothegaugecouplingsinthe1-loope ectivepotential,theradiativelycorrectedmassofthescalarHiggsbosonpartiallycontainsthegaugebosoncon-tributions.Atthe1-looplevel,theupperboundonthelighterscalarHiggsboson

masscanbeincreasedabout20GeVinfavorofthepartialcontributionsofthegaugebosons.ThustheimprovedabsoluteupperboundonthelighterscalarHiggsbosonmassisabout150GeV.