Abstract
An observed downward shift ($\ensuremath{\Delta}M$) in the mass of the standard model $Z$ can be used to place a model-dependent upper limit on the mass of new ${Z}^{\ensuremath{'}}$ gauge bosons for a given value of the top-($t$-)quark mass. Model-dependent lower bounds on the absolute value of the $Z\ensuremath{-}{Z}^{\ensuremath{'}}$ mixing angle ($\ensuremath{\varphi}$) are also obtained from this analysis. For definiteness, this situation is analyzed within the context of two classes of ${\mathrm{E}}_{6}$ superstring-inspired models as well as the left-right-symmetric model all of which contain additional neutral gauge bosons.
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