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The Tevatron, where the top quark was discovered, and the currentlyfunctional Large Hadron Collider (LHC), with copiously produced top pairs,enable a detailed study of top-quark properties. In particular, they can beused to test the couplings of the top quark to gauge bosons. Several extensionsof the standard model (SM) can give rise to anomalous couplings of the topquark to gauge bosons, in particular, the gluons. In this work we examine howtop-quark polarization, which is predicted to be negligibly small in the SM,can be used to measure chromomagnetic and chromoelectric couplings of the topquark to gluons. We lay special emphasis on the use of angular distributionsand asymmetries of charged leptons arising from top decay as measures of toppolarization and hence of these anomalous couplings. Sensitivities that may bereached at the Tevatron and the LHC are obtained.

Probing chromomagnetic and chromoelectric couplings of the top quark using its polarization in pair production at hadron colliders