Radiative electroweak breaking with pseudo Goldstone Higgs doublets

We consider a realistic example of supersymmetric grand unification based on SU(3)(c) X SU(3)(L) X SU(3)(R) in which the electroweak (EW) Higgs doublets are ''light'' as a consequence of the ''pseudo Goldstone'' mechanism. We discuss radiative EW breaking in this model, exploring in particular the ''small'' (order unity) and ''large'' (approximate to m(t)/m(b)) tan beta regions by studying the variations of r(2)(=mu(1,2)(2)/mu(3)(2)), where mu(1,2,3)(2) are the well-known MSSM parameters evaluated at the GUT scale. For \r\ sufficiently close to unity the quantity tan beta can be of order unity, but the converse is not always true.