Perturbative unification of soft supersymmetry-breaking terms

Perturbative unification of soft supersymmetry-breaking (SSB) parameters is proposed in gauge-Yukawa unified models. The method, which can be applied in any finite order in perturbation theory, consists in searching for renormalization group invariant relations among the SSB parameters, which are consistent with perturbative renormalizability. For the minimal gauge-Yukawa unified model based on SU(5) we find that the low energy SSB sector contains a single arbitrary parameter, the unified gaugino mass. Within a certain approximation we find that the model predicts a superpartner spectrum which is consistent with the experimental data.