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Top quark flavor changing neutral current (FCNC) interactions are highlysuppressed in the Standard Model. Therefore, any large signal of FCNCs willindicate the existence of new interactions. In this paper, searches for FCNCinteractions in top quark production and decay at the Tevatron and LHC arepresented. FCNC searches in $t\rightarrow qZ$ and $t\rightarrow Hq$ decays, andin top quark production in $pp\rightarrow t+j$, $pp\rightarrow t+Z$ aresummarized. Effect of top quark FCNCs on single top quark cross-section, andthe searches for same-sign top quark pair production through FCNCs are alsodescribed. None of the searches yielded positive results and exclusion limitson branching rations, coupling strengths and cross-sections are obtained.Future prospects of FCNC searches are also briefly discussed.

Flavor changing neutral currents in top quark production and decay