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Effective portals to heavy neutral leptons
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abstract
The existence of right-handed neutrinos, or heavy neutral leptons (HNLs), is strongly motivated by the observation of neutrino masses and mixing. The mass of these new particles could lie below the electroweak scale, making them accessible to low-energy laboratory experiments. Additional new physics at high energies can mediate new interactions between the Standard Model particles and HNLs, and is most conveniently parametrized by the neutrino Standard Model Effective Field Theory, or $\nu$SMEFT for short. In this work, we consider the dimension six $\nu$SMEFT operators involving one HNL field in the mass range of $\mathcal{O}(1)$ MeV $<M_N< \mathcal{O}(100)$ GeV. By recasting existing experimental limits on the production and decay of new light particles, we constrain the Wilson coefficients and new physics scale of each operator as a function of the HNL mass.
Forward citations
Cited by 12 Pith papers
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NA64mu data yield first 90% CL bounds on two SMEFT and three nuSMEFT four-lepton operators involving muons, with future projections to Lambda ~ 100 GeV.
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Heavy Neutral Leptons without Prejudice
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