Measurement ofZ′couplings at future hadron colliders through decays toτleptons

The leptonic couplings of a $Z^{\prime }$ can be determined in a hadron collider by measuring the polarization of $\tau$ leptons produced by its decay. This polarization can be measured despite the unobserved neutrinos produced in $\tau$ decay. The information obtained is complementary to that given by the forward-backward asymmetry and can be used to determine the character of the $Z^{\prime }$. We discuss the background to this process, the expected uncertainty of the measurement, and the implied detector requirements.