W-pair production in electron-positron collisions for a rank-5 Wilson-loop-brokenE6model

We develop a rank-5 Wilson-loop-broken ${\mathrm{E}}_6$ model with sufficient Higgs-boson content to break finally to ${\mathrm{SU}}_3^{\mathrm{c}}$×${\mathrm{U}}_1^{\mathrm{EM}}$. We find it necessary to obtain at least some of our Higgs-boson content from generation multiplets. The model is used to study W-pair production in $e^{+}$ $e^{\mathrm{-}}$ collisions. This process is sensitive to the existence of extra neutral gauge bosons. In particular, for a case with the leptonic sector reducing to that of the standard model, the process could be used to measure a possible mixing of the extra boson with the ordinary $Z^0$.