Abstract
One of the best tests for compositeness of leptons or quarks is the presence of an anomalous magnetic moment F/sub 2/. We determine limits on F/sub 2/ for the tau, from e/sup +/e/sup -/..-->..tau/sup +/tau/sup -/ at PETRA, of F/sub 2//sup tau/< or =0.02. We also present limits on the F/sub 2/ of the quarks. We suggest lower-energy experiments on the angular distribution to give an independent measurement of F/sub 2//sup tau/. Future experiments near the Z/sup 0/ peak are discussed.
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