2-LOOP RADITIVE CORRECTIONS TO THE LIGHTEST HIGGS-BOSON MASS IN THE MINIMAL SUPERSYMMETRIC MODEL

In the minimal supersymmetric model (MSSM), the upper limit of the lig htest Higgs boson mass, m(h)o, depends strongly on the top quark mass, m(t). We have computed the dominant two-loop radiative corrections to this upper limit of m(h)0 in order to eliminate large uncertainties d ue to QCD and m(t)6 corrections. It is shown that the QCD corrections significantly reduce the one-loop corrections. As a result, the SUSY p arameter space accessible to LEP experiments is significantly increase d.