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Global Constraints on a Heavy Neutrino
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abstract
We estimate constraints on the existence of a heavy, mostly sterile neutrino with mass between 10 eV and 1 TeV. We improve upon previous analyses by performing a global combination and expanding the experimental inputs to simultaneously include tests for lepton universality, lepton-flavor-violating processes, electroweak precision data, dipole moments, and neutrinoless double beta decay. Assuming the heavy neutrino and its decay products are invisible to detection, we further include, in a self-consistent manner, constraints from direct kinematic searches, the kinematics of muon decay, cosmology, and neutrino oscillations, in order to estimate constraints on the values of $|U_{e4}|^2$, $|U_{\mu4}|^2$, and $|U_{\tau4}|^2$.
Forward citations
Cited by 3 Pith papers
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Muon Bremsstrahlung as a New Probe of Dark Sector at Neutrino Experiments
Muon bremsstrahlung from the focused muon beam at neutrino facilities can produce heavy neutral leptons up to ~1 GeV, opening new search territory for SBND and DUNE Near Detector.
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Searching for Hidden Sector Particles at Neutrino Telescopes
IceCube could detect double-bang events from hidden sector particles produced via the neutrino or hypercharge portal, extending sensitivity to masses of about 1-20 GeV.
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Heavy Neutral Lepton Decay Searches using Solar Neutrinos
A new differential decay width including neutral and charged current interference is used to show that future detectors could probe HNL mixing angles over two orders of magnitude below current bounds.
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