ONE-LOOP CORRECTIONS TO THE HIGGS SECTOR IN MINIMAL SUPERGRAVITY MODELS

We study the Higgs spectrum of the minimal supersymmetric standard mod el in the context of super-gravity models with radiative gauge-symmetr y breaking, including the leading one-loop corrections. We find that, unlike in more general scenarios, these corrections cannot change the ordering of the Higgs-boson masses as predicted by tree-level expressi ons. Moreover, the upper bound on the mass of the lightest Higgs boson is reduced compared to the general case; however, even in the most re strictive supergravity model the Higgs sector might escape detection a t the CERN Large Electron-Positron Collider LEP 200. We also present a n expression for the one-loop-corrected charged-Higgs-boson mass, and describe an improved calculation of the bound on the lightest Higgs bo son in general global supersymmetry scenarios.