Cobimaximal neutrino mixing in the U(1)B−L extension with A4 symmetry
Abstract
We propose a renormalizable U(1)B−L extension of the Standard model with A4 symmetry that leads to the successful cobimaximal lepton mixing ansatz, thus providing a predictive explanation for leptonic mixing observables. The smallness of the active neutrino masses and neutrino masses ordering are produced by the type-I seesaw mechanism at the tree-level. The obtained physical parameters are well consistent with the global fit of neutrino oscillation.1 The model is predictive in the sense that it reproduces the experimental values of neutrino parameters in which the reactor neutrino mixing angle 𝜃13 get the best-fit value and the solar and atmospheric neutrino mixing angles have little deviations from the best-fit values given in Ref. 1, however, they are consistent with the other experimental results.3,4 The effective neutrino masses governing the neutrinoless double beta decay is predicted to be 〈mee〉=8.25×10−3eV for normal hierarchy and 〈mee〉=4.92×10−2eV for inverted hierarchy which are well consistent with the recent experimental limits on neutrinoless double beta decay.
