Rare top quark decayst→cVin the top-color-assisted technicolor model

Abstract

We consider the rare top quark decays in the framework of the top-color-assisted technicolor (TC2) model. We find that the contributions of top-pions and top-Higgs-bosons predicted by the TC2 model can enhance the SM branching ratios by as much as 6--9 orders of magnitude; i.e., in the extreme case, the orders of magnitude of branching ratios are $Br(\stackrel{\ensuremath{\rightarrow}}{t}cg)\ensuremath{\sim}{10}^{\ensuremath{-}5},$ $Br(\stackrel{\ensuremath{\rightarrow}}{t}cZ)\ensuremath{\sim}{10}^{\ensuremath{-}5},$ $Br(\stackrel{\ensuremath{\rightarrow}}{t}c\ensuremath{\gamma})\ensuremath{\sim}{10}^{\ensuremath{-}7}.$ With reasonable values of the parameters in the TC2 model, such rare top quark decays may be testable in future experiments. Therefore, rare top quark decays provide a unique way to test the TC2 model.