Abstract
We discuss searches for violation of CPT and Lorentz invariance in the production and decay of top quarks in the lepton+jets channels of pp → tt events collected at the DO experiment of the Fermilab Tevatron collider. Based on an analysis of 1 fb of data, we present a measurement of the mass difference between top and antitop quarks, which is expected to vanish if CPT is conserved, and we discuss a search for a harmonic dependence of the tt production cross section on sidereal time, a result expected from violation of Lorentz invariance in the Standard-Model Extension. These are the first searches for such effects in interactions involving free quarks.
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