Abstract
The top-quark Yukawa infrared fixed-point solution of the renormalization group equations, with minimal supersymmetry and GUT unification, defines a low-energy spectrum of supersymmetric particle masses in terms of a few GUT-scale parameters assuming universal boundary conditions. The authors give predictions in this model for the inclusive b approaches s(gamma) branching fraction and investigate the impact of non-universal scalar mass boundary conditions. The authors find their results do not depend significantly on the value of the GUT-scale trilinear coupling A(sub G). The small tan beta region favors predictions for the inclusive b approaches s(gamma) branching fraction close to that of the Standard Model value. Nevertheless forthcoming experimental results can eliminate some regions of the GUT parameter space. (NTIS)