Finding Z ' bosons coupled preferentially to the third family at CERN LEP and the Fermilab Tevatron - art. no. 035006

Z' bosons that couple preferentially to the third generation fermions can a rise in models with extended weak [SU(2)xSU(2)] or hypercharge [U(1)xU(1)] gauge groups. We show that existing limits on quark-lepton compositeness se t by the CERN LEP and Fermilab Tevatron experiments: translate into lower b ounds of the order of a few hundred GeV on the masses of these Z' bosons. R esonances of this mass can be directly produced at the Tevatron. Accordingl y, we explore in detail the limits that can be set at Run II using the proc ess p (p) over bar-->Z'-->tau tau-->e mu. We also comment on the possibilit y of using hadronically decaying taus to improve the limits.