The Jarlskog invariant is\(J = \left( 3.04_{-0.20}^{+0.21} \right) \times 10^{-5}\). In the lepton sector, on the other hand, we know that active neutrinos have a small, but not negligible mass, which can be understood by the type I see-saw mechanism [11,12,13,14,15,16]...
Let us point out that an analytical study on the lepton mixing, in the PLRT, was already made in detail in the par- ticular case where the Majorana phases are CP parities, and this means that these can be 0 or π [58]. In what follows, the theoretical PMNS mass mixing matrix is ...