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Future CEvNS experiments as probes of lepton unitarity and light-sterile neutrinos
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abstract
We determine the sensitivities of short-baseline coherent elastic neutrino-nucleus scattering (CE$\nu$NS) experiments using a pion decay at rest neutrino source as a probe for nonunitarity in the lepton sector, as expected in low-scale type-I seesaw schemes. We also identify the best configuration for probing light sterile neutrinos at future ton-scale liquid argon CE$\nu$NS experiments, estimating the projected sensitivities on the sterile neutrino parameters. Possible experimental setups at the Spallation Neutron Source, Lujan facility and the European Spallation Source are discussed. Provided that systematic uncertainties remain under control, we find that CE$\nu$NS experiments will be competitive with oscillation measurements in the long run.
Forward citations
Cited by 5 Pith papers
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Searches for heavy neutral lepton decays at spallation neutron sources
Current and future COHERENT detectors at the SNS can set competitive limits on HNL–neutrino mixings through pion/muon DAR production and in-detector e+e− decays, with muon mixing offering the strongest near-term reach.
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Probing non-unitarity of the PMNS matrix in P2SO and comparison with DUNE
Projected GLoBES sensitivities show DUNE constrains the non-unitarity parameters α11 and |α21| better, while P2SO wins on α33 (and marginally α22); non-unitarity also distorts mass-hierarchy, octant, and CP-violation ...
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Probing Light Dark Particles in Neutrino Scattering Experiments
A dark fermion produced in neutrino scattering could be probed at DUNE's near detector up to cutoff scales near 1 TeV, beyond CHARM II and LEP, while current COHERENT/CONUS+ limits stay below LHC bounds.
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Testing lepton non-unitarity with the next generation of Germanium-based CE$\nu$NS reactor experiments
A future 100-kg Germanium reactor CEνNS experiment could constrain lepton non-unitarity to 1−α11² ≈ 0.005 and, under low-scale seesaw assumptions, probe new-physics scales up to ~2.5 TeV.
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Probing conventional and new physics at the ESS with coherent elastic neutrino-nucleus scattering
Projected ESS CEνNS measurements would improve current constraints on the weak mixing angle, nuclear neutron radii, and several new physics scenarios by large factors, and would lead in some unexplored mass ranges.
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