Rare decays as diagnostics forZ′gauge couplings at hadron colliders

We propose rare decays of $Z^{\prime }\to f_1{\overline{f}}_{2}V$ (with $V=W or Z$, and $f_{1,2}$ ordinary fermions) as diagnostic tests for gauge couplings of possible $Z^{\prime }$ gauge bosons at future hadron colliders. Because of the collinear singularity such decay rates have a logarithmic enhancement proportional to ${\mathrm{In}}^2\left(\frac{M_{Z^{\prime }}^2}{M_V^2}\right)$. For $M_{Z^{\prime }}\sim 1$ TeV and a large class of models, there would be a sufficiently large (> ${10}^2$) number of leptonic and semileptonic events at projected luminosities at the CERN Large Hadron Collider and Superconducting Super Collider. A discussion of backgrounds and a comparison with the forward-backward asymmetry are given.