INFORMATION AND DISCRIMINATION FROM B-QUARK PRODUCTION ON THE Z-RESONANCE

We introduce and define operatively, in a model-independent way, a new ''heavy'' b-vertex parameter eta(b) that can be derived from the meas urement of a special polarization asymmetry for production of b quarks on the Z resonance. We show that the combination of the measurement o f eta(b) With that of a second and previously defined ''heavy'' b-vert ex parameter delta(bV) can discriminate a number of models of new phys ics that are associated with different ''trajectories'' in the plane o f the variations of the two parameters. This is shown in particular fo r some popular SUSY and technicolor-type models. In general, this disc rimination is possible if a measurement of both parameters is performe d.