Top FCNC decays in the aligned two-Higgs doublet model

Abstract

We compute the flavour-changing top decays t -> ch and t -> cV (V =g ,Z)within the framework of the aligned two-Higgs-doublet models. By exploitingconstraints from flavour physics and the measured Higgs properties, weinvestigate the parameter space of the model and its impact on theassociated branching ratios. It is observed that the Higgs signal strengthin the di-photon channel imposes important restrictions on the t -> chdecay rate when the charged scalar of the model is light. We conclude thatthe rates of these flavour-changing top decays are beyondthe expected sensitivity of the future high-luminosity phase of the LHC.