Information and Discrimination from b Quark Production on Z Resonance

Abstract

We introduce and define operatively in a model independent way a new ``heavy" b-vertexparameter, ${\eta }_b$, that can be derived from the measurement of a special polarization asymmetry for production of b-quarks on Z resonance. We show that the combination of the measurement of ${\eta }_b$ with that of a second and previously defined ``heavy" b-vertex parameter ${\delta }_{bV}$ can discriminate a number of models of New Physics that remain associated to different ``trajectories" in the plane of the variations of the two parameters. This is shown in particular for some popular SUSY and technicolor-type models. In general, this discrimination is possible if a measurement of \underline{both} parameters is performed.

Comments: 22 pages, 6 figures available by air mail upon request, (e-mail renard@lpmsun2.lpm.univ-montp2.fr PM/94-04, UTS-DFT-94-02 .( revised version with corrected references)