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Classification of lepton mixing matrices from finite residual symmetries · Around

2014

Classification of lepton mixing matrices from finite residual symmetries

Fonseca, Renato M., Grimus, Walter

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Assuming that neutrinos are Majorana particles, we perform a complete classification of all possible mixing matrices which are fully determined by residual symmetries in the charged-lepton and neutrino mass matrices.

The classification is based on the assumption that the residual symmetries originate from a finite flavour symmetry group.
The mathematical tools which allow us to accomplish this classification are theorems on sums of roots of unity.
We find 17 sporadic cases plus one infinite series of mixing matrices associated with three-flavour mixing, all of which have already been discussed in the literature.

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