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Flavor changing neutral current (FCNC) interactions for a top quark $t$decays into $Xq$ with $X$ represents a neutral gauge or Higgs boson, and $q$ aup- or charm-quark are highly suppressed in the Standard Model (SM) due to theGlashow-Iliopoulos-Miami mechanism. Whilst current limits on the branchingratios of these processes have been established at the order of $10^{-4}$ fromthe Large Hadron Collider experiments, SM predictions are at least nine ordersof magnitude below. In this work, we study some of these FCNC processes in thecontext of an extended mirror fermion model, originally proposed to implementthe electroweak scale seesaw mechanism for non-sterile right-handed neutrinos.We show that one can probe the process $t \to Zc$ for a wide range of parameterspace with branching ratios varying from $10^{-6}$ to $10^{-8}$, comparablewith various new physics models including the general two Higgs doublet modelwith or without flavor violations at tree level, minimal supersymmetricstandard model with or without $R$-parity, and extra dimension model.

Top Quark Rare Decays via Loop-Induced FCNC Interactions in Extended Mirror Fermion Model