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We present a comprehensive analysis of the loop induced top quark FCNCsignals at the LHC within one class of the simplified model. The loop levelFCNC interactions are well motivated to avoid the hierarchy of the top quarkcouplings from the new physics and standard model. Such a theory will posit aMajorana dark matter candidate and could be tested through dark matter relicdensity, direct detection experiments (the scattering between dark matter andheavy nuclei), and the collider signals at the LHC. We find that thespin-independent (SI) scattering between Majorana dark matter and nuclei willvanish at the leading order, while the next-to-leading order correction to theSI scattering becomes significance to constrain the parameter space of themodel. A detailed comparison from direct detection experiments and LHC searchesis also discussed and both of them are very important to full constrain themodel.

Loop induced top quark FCNC through top quark and dark matter interactions