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The tiny neutrino masses can be explained naturally by extending the standardmodel with right-handed Majorana neutrinos in low-scale seesaw mechanism, andthe CP violation effect induced by Majorana phase is interesting and worthstudying at colliders. In this paper, we investigate the prospects formeasuring CP violation in top quark pair production and rare decay via Majorananeutrinos at the LHC. The CP asymmetry stems from the significant interferenceof contributions from two different Majorana neutrinos and can be appreciablewhen the two neutrino masses are nearly-degenerate. It is found that in theMajorana neutrino mass range of 10 GeV < mn < 80 GeV, the CP asymmetry isindependent of the Majorana neutrino mass at the LHC. Any possible newobservation of CP violation will be the clear evidence of new physics beyondthe standard model.

CP violation in top quark decay via heavy Majorana neutrinos at the LHC