TOP-QUARK PRODUCTION IN HADRON-HADRON COLLISIONS AND ANOMALOUS TOP-QUARK-GLUON COUPLINGS

We discuss the influence of anomalous t(t) over barG$ couplings on tot al and differential <t(t)over bar> production cross sections in hadron -hadron collisions. We study in detail the effects of a chromoelectric and a chromomagnetic dipole moment d(t)' and mu(t)' of the top quark. We estimate the values of d(t)' and mu(t)' which are allowed by the p resent Fermilab Tevatron experimental results on top-quark production in <t(t)over bar> collisions. In the mu(t)'-d(t)' plane, we find a who le region where the anomalous couplings give a zero net contribution t o the total top-quark production rate. In differential cross sections, the anomalous moments have to be quite sizable to give measurable eff ects. A chromoelectric dipole moment of the top quark violates CP inva riance. We discuss a CP-odd observable (O) over cap(L)$ which allows f or a direct search for CP violation in top-quark production. We find t hat the presence of a chromomagnetic moment mu(t)' can influence the s ensitivity of (O) over cap(L)$ to d(t)' considerably.