banti b-production on the Z-resonance: A challenge to the standard model

We study the potentialities for exposing physics beyond the standard model that are offered by accurate measurements of the process Z → banti b in a high luminosity phase at LEP. In particular we propose a strategy by defining observables in such a way that they are separately sensitive to different kinds of New Physics. This approach enables us to show that with 107-108 produced Z from analysis of banti b pairs one may either obtain very stringent bounds on the extra neutral gauge bosons sector, or identify it unambiguously. Also, it appears that Z → banti b provides under those circumstances a privileged tool to reveal clean virtual effects of supersymmetry. (orig.)