In the one-singlet seesaw plus two-Higgs-doublet model, the neutrino Yukawa couplings can be expressed analytically through the measured neutrino masses, the PMNS matrix, and only two free parameters, phi' and lambda_D.
Majorana neutrino mass matrix with CP symmetry breaking
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abstract
From the new existing data with not vanishing theta13 mixing angle we determine the possible shape of the Majorana neutrino mass matrix. We assume that CP symmetry is broken and all Dirac and Majorana phases are taken into account. Two possible approaches "bottom-up" and "top down" are presented. The problem of unphysical phases is examined in detail.
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Seesaw neutrinos with one right-handed singlet field and a second Higgs doublet
In the one-singlet seesaw plus two-Higgs-doublet model, the neutrino Yukawa couplings can be expressed analytically through the measured neutrino masses, the PMNS matrix, and only two free parameters, phi' and lambda_D.