Abstract
We study how strongly the determination of the elements of the leptonic mixing matrix relies in assuming its unitarity. We show that oscillation experiments are only sensitive to half of the matrix elements, while the other half are usually derived from them imposing unitarity. We also find that the constraints on unitarity deviations from weak decays combined with the matrix elements measured in oscillations is enough to bound all the matrix elements. Precision improvements within future facilities are discussed as well.
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