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In the case where the Standard Model is extended by one heavy Majoranafermion, the branching fractions of semileptonic meson decays into same-signand opposite-sign dileptons are expected to be of the same order. As we discusshere, this need not be the case in extensions by at least two sterile fermions,due to the possible destructive and constructive interferences that mightarise. Depending on the $CP$ violating phases, one can have an enhancement ofthe lepton number violating modes and suppression of the lepton numberconserving ones (and vice-versa). We explore for the first time theinterference effects in semileptonic decays, and illustrate them for a futureobservation of kaon decays at NA62. We also argue that a non-observation of agiven mode need not be interpreted in terms of reduced active-sterile mixings,but that it could instead be understood in terms of interference effects due tothe presence of several sterile states; in particular, for different-flavourfinal state charged leptons, observing a lepton number conserving process andnot a lepton number violating one does not rule out that the mediators areMajorana fermions.

Interference effects in LNV and LFV semileptonic decays: the Majorana hypothesis