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

We have reanalyzed the decay patterns of the gluino ({ital {tilde g}}) incorporating all its decays to charginos ({ital {tilde W}}{sub {ital i}}) and neutralinos ({ital {tilde Z}}{sub {ital i}}) as given by the minimal model. We have made an independent computation of the decay width for {ital {tilde g}}{r arrow}{ital g{tilde Z}}{sub {ital 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 {ital {tilde g}}{r arrow}{ital t{bar t}{tilde Z}}{sub {ital 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 {ital {tilde g}}{r arrow}{ital t{bar t}{tilde Z}}{sub {ital i}} is large. The significance of these decays for gluino signatures in collider experiments is briefly commented on.