Z' Search in e+e- Annihilation

Abstract

Expectations for constraints on extra Z bosons are derived for LEP 2 and future linear e+e- colliders. For typical GUTs, a Z&#39; with M_{Z&#39;} \le 3 to 6 \sqrt{s} may cause observable effects. The Z&#39; discovery limits are dominated by statistical errors. However, if a Z&#39; signal is observed, the discrimination between different models becomes much worse if systematic errors are taken into account. Discrimination between models is possible for M_{Z&#39;} < 3 \sqrt{s}. A determination of Z&#39; f \bar f couplings independently of models becomes attractive with future colliders. Anticipated bounds are determined.