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We consider gq -> Zt, gq -> gamma t and gq -> t production (q=u,c) mediatedby strong flavour-changing neutral interactions within an effective operatorframework. We provide total cross sections for Tevatron and LHC, showingexplicitly that the six processes can be described in full generality in termsof only two parameters (anomalous couplings) for q=u plus two for q=c. In ourwork we take into account and study in detail the effects of top quark decay.For gamma t, the inclusion of the top quark decay in the matrix element revealsan striking result: the largest contribution to the final state, e.g. gamma lnu b, with l = e, mu, tau, does not result from gq -> gamma t -> gamma l nu bbut from on-shell gq -> t production with t -> gamma l nu b, being the photonradiated off the top decay products. This contribution, missed in previousliterature, increases the signal cross sections by factors ranging between 3and 6.5.

Zt, gamma t and t production at hadron colliders via strong flavour-changing neutral couplings