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The extension of the Standard Model with two gauge-singlet Majorana fermionscan simultaneously explain two beyond-the-Standard-model phenomena: neutrinomasses and oscillations, as well as the origin of the matter-antimatterasymmetry in the Universe. The parameters of such a model are constrained bythe neutrino oscillation data, direct accelerator searches, big bangnucleosynthesis, and requirement of successful baryogenesis. We show that thecombination of all these constraints still leaves an allowed region in theparameter space below the kaon mass. This region can be probed by the furthersearches of NA62, DUNE, or SHiP experiments.

An allowed window for heavy neutral leptons below the kaon mass