Quasi-infra-red fixed points and renormalisation group invariant trajectories for non-holomorphic soft supersymmetry breaking

In the MSSM the quasi-infra-red fixed point for the top-quark Yukawa coupling gives rise to specific predictions for the soft-breaking parameters. We discuss the extent to which these predictions are modified by the introduction of additional “non-holomorphic” soft-breaking terms. We also show that in a specific class of theories, there exists an RGinvariant trajectory for the “non-holomorphic” terms, which can be understood using a holomorphic spurion term.