We discuss an optimal $R$-parity-breaking SUSY solution to the $R_b$ excess as well as the ALEPH four-jet anomaly. The latter arises from the pair production of a top squark via chargino decay at CERN LEP 1.5, followed by its $R$-violating decay into a light quark pair. The model satisfies top quark and $Z$-boson decay constraints along with gaugino mass unification.

• Received 8 August 1996

DOI:https://doi.org/10.1103/PhysRevD.54.6797