Differentiating various extra $Z^{\prime }$'s at Future Colliders

Abstract

We propose a way to differentiate between various extra $U(1)$ models using flavor tagging in the decay modes $Z^{\prime }\to q\bar{q}$ once the extra $Z^{\prime }$ is observed at future colliders in the lepton channel. A generalization of the R parameter, namely, one for charge $\frac{1}{3}$ and one for charge $\frac{2}{3}$ quark gives a two parameter test for the various models. Flavor tagging eliminates the uncertainty because of extra fermions and can reduce the QCD background at SSC/LHC dramatically. For $E_6$ and $SO(10)$ based models the former is always 3. This seems to be a very good way to eliminate certain models.