Nonoblique Corrections in Technicolor Theories Revisited

In extended technicolor (ETC) theories, while the sideways ETC boson exchange decreases the width ${\mathrm{\Gamma }}_b\equiv \mathrm{\Gamma }(Z\to b\bar{b})$, the flavor-diagonal ETC boson exchange tends to increase it, and the ETC-corrected $R_b\equiv {\mathrm{\Gamma }}_b\mathrm{/}{\mathrm{\Gamma }}_{had}$ value could agree with recent measurements. The $\tau$ asymmetry parameter may also increase in a way consistent with experiment. The weak-interaction $\rho$ parameter receives a correction from diagonal ETC exchange which is just barely acceptable by experiments.