Abstract
We calculate the contribution to the muon anomaly induced by new Yukawa couplings involving heavy-matter ${E}_{6}$ fields predicted in the framework of superstring theories. We analyze a few models found in the current literature and show that for some of them the effect is on the order of the standard weak contribution. We produce a specific example where the effect could be even larger. Thus, we conclude that an improved ${(g\ensuremath{-}2)}_{\ensuremath{\mu}}$ experiment should be sensitive to such effects, if they happen to exist.
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