Z' Constraints from e+e- to f fbar at NLC

Abstract

Constraints on extra neutral gauge bosons are obtained from $e^{+}{e}^{-}\to f\bar{f}$ at NLC energies. Model independent limits on the $Z^{\prime }f\bar{f}$ couplings and lower limits on the $Z^{\prime }$ mass are discussed. Typical GUTs with $M_{Z^{\prime }}$ up to (3 -- 6) $\sqrt{s}$ can be excluded. A distinction between different GUT scenarios is possible if $M_{Z^{\prime }}\le 3\sqrt{s}$. Radiative corrections give only small changes to the $Z^{\prime }$ exclusion limits provided that appropriate cuts are applied. %The inclusion of systematic errors leads to slightly worse results for %$M_{Z^{\prime }}^{lim}$.

Comments: 7 pages, LaTex, 3 figures, 1 table, available from http://www.ifh.de/~riemanns/ or on request from e-mail: riemanns@ifh.de; to appear in: Proceedings of Physics with e+e- Linear Colliders Workshop, Annecy - Gran Sasso - Hamburg 1995