Asymmetries ate+e−colliders fromE6grand unified theories

Motivated by the resurgence of interest in ${\mathrm{E}}_6$ grand unified theories due to their possible relevance as the low-energy limit of superstring theories, we studied the effects of the extra $Z^0$ bosons predicted by these theories on asymmetries in $e^{+}$ $e^{\mathrm{-}}$ collisions. It was found that the deviations from the standard model allowed by low-energy phenomenology can be quite substantial and that asymmetries at $e^{+}$ $e^{\mathrm{-}}$ colliders offer a sensitive probe for new physics. We describe a method of unraveling the underlying physics from the experimental data.