Phenomenology of gluino decays via loops and top-quark Yukawa coupling

We have reanalyzed the decay patterns of the gluino ($\tilde{g}$) incorporating all its decays to charginos (${\tilde{W}}_i$) and neutralinos (${\tilde{Z}}_i$) as given by the minimal model. We have made an independent computation of the decay width for $\tilde{g}\to g{\tilde{Z}}_i$ which occurs at one loop and shown that the branching fraction for this can be up to 0.5. We have also computed the width for $\tilde{g}\to t\overline{t}{\tilde{Z}}_i$ including the effect of the top-quark Yukawa coupling, which significantly increases this width. We have studied the gluino decay modes as a function of parameter space, and clearly delineated the regions where the loop decays or $\tilde{g}\to t\overline{t}{\tilde{Z}}_i$ is large. The significance of these decays for gluino signatures in collider experiments is briefly commented on.