Abstract
We summarize and update constraints on m t from present neutral current data. Soon precision measurements of M z will give a tight correlation between sin 2ϑ w and m t . Combining this information with low-energy neutral current data will pin down sin 2ϑ w and hence fix m> t with an error of ≈ ± 35 GeV. The central value of the top quark mass will be m t = 95 GeV + 66(91.6 GeV − M z ).
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