  The lepton or baryon number violating top quark interactions in the
supersymmetric standard model with R parity violation contribute to the process
d dbar to t tbar at the tree level via the t- or u-channel sfermion exchange.
Since these interactions are chiral, they induce polarization to the top quark
in the t tbar events at hadron colliders. We show in this article that the
polarization can be a useful observable for probing these interactions at the
upgraded Fermilab Tevatron collider, because the polarization is expected to be
very small in the standard model.
