Abstract
Lepton-quark contact interactions expected in composite theories can be tested using the forward-backward (F-B) asymmetry of charm or bottom hadrons in e + e − annihilation. Existing data on the F-B asymmetry of D ∗ and D mesons can already set lower limits typically exceeding 1 TeV (95% CL) on the compositeness scale. These limits are better than those for pure quark contact interactions set by the CERN pp̄ collider experiments, and are comparable to purely leptonic ones obtained in e + e − annihilation experiments. The implication of bottom quark asymmetry in the presence of B 0 − B 0 mixing is also briefly discussed.
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