Detecting the non-universal gauge boson $Z^{{}^{\prime }}$ at high-energy $e^{+}{e}^{-}$ collider

Abstract

In the context of topcolor-assisted techicolor($TC2$) models, we investigate the feasibility of detecting the non-universal gauge boson $Z^{{}^{\prime }}$ in the future high-energy linear $e^{+}{e}^{-}$ collider($LC$) experiments by performing ${\chi }^2$ analysis via studying its virtual effects on the processes $e^{+}{e}^{-}\to f\bar{f}$ with $f=\tau$, $\mu$, b, and c. We find that the non-universal gauge boson $Z^{{}^{\prime }}$ is most sensitive to the process $e^{+}{e}^{-}\to \tau \bar{\tau }$. Discovery limits of the $Z^{{}^{\prime }}$ mass $M_{Z^{{}^{\prime }}}$ can be enhanced by the suitably polarized beams. If we assume that polarization of electron beam and positron beam are 80% and 60%, the $LC$ experiment with $\sqrt{s}=500GeV$ and ${\pounds }_{int}=340f{b}^{-1}$ can explore $M_{Z^{{}^{\prime }}}$ up to 8$TeV$ for the coupling parameter $K_1\le$0.8 at 95% $CL$.

Comments: 11 pages, 2 figures