Large Top and Bottom Yukawa Couplings in Minimal Supersymmetry

We present analytic expressions for the top and bottom Yukawa couplings in the context of the minimal supersymmetric standard model when both couplings h t,0 , h b,0 are large at the unification scale. For sufficiently large h t,0 , h b,0 , i.e. within ∼ (20 − 25)% close to their fixed point values, using as input the central value of the bottom mass m b (m b) = 4.25GeV , we find that the top mass lies in the range m t ≈ (174 − 178)GeV , while tanβ ≈ (55 − 58). Implications on the evolution of the scalar masses and the radiative symmetry breaking scenario are discussed.