Experimental tests of leptogenesis

The extension of the Standard Model by heavy right handed neutrinos can simultaneously explain the observed neutrino masses via the seesaw mechanism and the baryon asymmetry of the universe via leptogenesis. If the mass of the heavy neutrinos is at or below the TeV scale, they can be found in collider or fixed target experiments. We derive predictions for the properties of heavy neutrinos from the requirement to explain the observed baryon asymmetry of the universe. If any heavy neutral leptons are found in future experiments, our predictions can be used as a criterion to assess whether these new particles can be responsible for the origin of matter in the universe.