Revisiting leptonic nonunitarity

Aloni, Daniel; Dery, Avital

doi:10.1103/PhysRevD.109.055006

Title: Revisiting leptonic nonunitarity

Journal Article · 04 March 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.109.055006 · OSTI ID:2318599

; Dery, Avital

In the presence of extra neutrino states at high scales, the low-energy effective $3 \times 3$ leptonic mixing matrix (LMM) is in general nonunitary. We revisit the question of what is our current knowledge of individual LMM matrix elements without assuming unitarity. We first demonstrate that a minimal set of experimental constraints suffices in bounding LMM nonunitarity parameters to the level of $O (10^{- 3})$ , without the use of neutrino oscillation data. We then revisit oscillation results as a complementary cross-check, using different physics and different experimental techniques to probe a similar parameter space. We correct some common misconceptions in the neutrino nonunitarity literature resulting from an incautious treatment of input parameters. We find that neutrino oscillation experiments can constrain LMM nonclosure, but, contrary to claims in the literature, are completely insensitive to the overall normalization of the LMM. Thus, we conclude that oscillation experiments, including the future DUNE experiment, have no power in excluding nonunitarity altogether. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0015845

OSTI ID:: 2318599

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Vol. 109 Journal Issue: 5; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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