Noncommuting ETC corrections to theZtt¯vertex

In this paper we calculate the corrections to $\mathrm{Zt}\overline{t}$ couplings induced by noncommuting extended technicolor (ETC) interactions. The extra parameters $\delta g_L^b,$ $s^2,$ and $1/x$ of noncommuting ETC models and the usual standard model (SM) parameters will be assumed to be determined from a global fit to the CERN LEP 1 EW data. We find that in the heavy (light) case $F_L^t$ is modified by, at most, 4% (2.8%) relative to its SM value provided $\delta R_b<\mathrm{0.0088.}\mathrm{}$ This implies that it will be very difficult to disentangle the ETC corrections from SM corrections to the $\mathrm{Zt}\overline{t}$ vertex or to probe the effects of noncommuting ETC on $\mathrm{Zt}\overline{t}$ couplings with the projected Next Linear Collider precision of measuring them.