If it can be ascertained experimentally that the 3×3 Majorana neutrino mass matrix M_ν has vanishing determinants for one or more of its 2×2 submatrices, it may be interpreted as supporting evidence for the theoretically well-known canonical seesaw mechanism. I show how these two things are connected and offer a realistic M_ν with two zero subdeterminants as an example.
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Ernest Ma (2005) studied this question.
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