Non-unitary neutrino mixing in short and long-baseline experiments

Abstract

Non-unitary neutrino mixing in the light neutrino sector is a direct consequence of type-I seesaw neutrino mass models. In these models, light neutrino mixing is described by a sub-matrix of the full lepton mixing matrix and, then, it is not unitary in general. In consequence, neutrino oscillations are characterized by additional parameters, including new sources of CP violation. Here we perform a combined analysis of short and long-baseline neutrino oscillation data in this extended mixing scenario. We did not find a significant deviation from unitary mixing, and the complementary data sets have been used to constrain the non-unitarity parameters. We have also found that the T2K and NOvA tension in the determination of the Dirac CP-phase is not alleviated in the context of non-unitary neutrino mixing.

18 pages

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Cited by in corpus (15)

• The Present and Future Status of Heavy Neutral Leptons
• Snowmass White Paper: Beyond the Standard Model effects on Neutrino Flavor
• Low-energy probes of sterile neutrino transition magnetic moments
• Tau Neutrinos in the Next Decade: from GeV to EeV
• New oscillation and scattering constraints on the tau row matrix elements without assuming unitarity
• Non-unitary Leptonic Flavor Mixing and CP Violation in Neutrino-antineutrino Oscillations
• Model-Independent Constraints on Non-Unitary Neutrino Mixing from High-Precision Long-Baseline Experiments
• Very Light Sterile Neutrinos at NOvA and T2K
• Non-unitary three-neutrino mixing in the early Universe
• Nonunitarity of the lepton mixing matrix at the European Spallation Source
• New Physics searches in a low threshold scintillating argon bubble chamber measuring coherent elastic neutrino-nucleus scattering in reactors
• Probing non-unitary neutrino mixing via long-baseline neutrino oscillation experiments based at J-PARC
• Precision measurements and tau neutrino physics in a future accelerator neutrino experiment
• Improving CP Measurement with THEIA and Muon Decay at Rest
• Seesaw, coherence and neutrino oscillations