DIAGNOSTIC POWER OF FUTURE COLLIDERS FOR Z' COUPLINGS TO QUARKS AND LEPTONS - E(-) VERSUS PP COLLIDERS()E()

We study the diagnostic power of future e(+)e(-) colliders with root s = 500 GeV [the Next Linear Collider (NLC)] for a model-independent de termination of the Z' gauge couplings to quarks and leptons. The inter ference of the Z' propagator with the photon and the Z propagator in t he two-fermion final state probes are sensitive to the magnitude as we ll as relative signs of quark and lepton charges. For Z' with M(Z') si milar to 1 TeV all the quark and lepton charges can be determined to a round 10-20%, provided heavy flavor tagging and longitudinal polarizat ion of the electron beam is available. The errors are 2-10 times large r without polarization, and very little information can be obtained ab out quark charges without heavy flavor tagging. We point out the compl ementarity of future hadron colliders. At the CERN Large Hadron Collid er (LHC) primarily the magnitude of three out of four corresponding co uplings can be measured; however, their error bars are typically by a factor of similar to 2 smaller than those at the NLC.