Revisiting leptonic nonunitarity
Revisiting leptonic nonunitarity
In the presence of extra neutrino states at high scales, the low-energy effective <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mn>3</a:mn><a:mo>×</a:mo><a:mn>3</a:mn></a:math> 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 …