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We study the perspective to observe lepton number violating signatures fromheavy Majorana neutrino decays at colliders in view of the requirement toexplain the light neutrino masses via the seesaw mechanism. In the minimalmodel with only two heavy neutrinos and in the $\nu$MSM one can identify threedistinct regions in the mass-mixing plane. For Majorana masses above theelectroweak scale the branching ratio for lepton number violating processes atthe LHC is generically suppressed. For masses well below the electroweak scalethat are probed in displaced vertex searches or at fixed target experimentslepton number violation is the rule and can only be avoided at the cost of finetuning. In between there is a mass regime where both possibilities coexist. Inmodels with more than two heavy neutrinos the larger parameter space allows formore freedom, but our results remain qualitatively correct unless there is amass degeneracy amongst more than two of the heavy neutrinos.

On Lepton Number Violation in Heavy Neutrino Decays at Colliders