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An allowed window for heavy neutral leptons below the kaon mass
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The extension of the Standard Model with two gauge-singlet Majorana fermions can simultaneously explain two beyond-the-Standard-model phenomena: neutrino masses and oscillations, as well as the origin of the matter-antimatter asymmetry in the Universe. The parameters of such a model are constrained by the neutrino oscillation data, direct accelerator searches, big bang nucleosynthesis, and requirement of successful baryogenesis. We show that the combination of all these constraints still leaves an allowed region in the parameter space below the kaon mass. This region can be probed by the further searches of NA62, DUNE, or SHiP experiments.
Forward citations
Cited by 2 Pith papers
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Constraining Heavy Neutral Leptons Coupled to the Tau-Neutrino Flavor at the Large Hadron Collider
DV searches with no prompt-lepton tag can probe HNLs with dominant tau-neutrino mixing at the LHC, improving existing bounds by more than an order of magnitude at Run 2 luminosity.
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Neutrinoless double beta decay rates and the $3 + 2$ scenario
A proceedings review of the author's prior EFT calculation of neutrinoless double beta decay and of a two-sterile-neutrino model, containing no new derivation.
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