Neutrino mass and lepton flavor violation in A4-based left–right symmetric model with linear seesaw
Abstract
We explore an A4 flavor-based left–right symmetric model where neutrino masses and mixing are explained through linear seesaw mechanism. Taking A4 flavor symmetry and left–right gauge symmetry together and adding a low-scale seesaw mechanism gives the advantage of (a) getting diagonal structures for both charged lepton mass matrix and Dirac neutrino mass matrix, (b) simpler relations among neutrino observables in the model and (c) large light-heavy neutrino mixing which gives dominant contributions to various lepton flavor violating decays like μ→eγ, μ→eee, μ→e. By saturating the experimental bounds on these decays we derive constraints on input model parameters and study analytically as well as numerically the correlation among model parameters and their dependence on experimentally determined neutrino parameters like 𝜃12, 𝜃23, 𝜃13, Δm2atm, Δm2sol. We also study CP-violation via Jarlskog invariants and show extra contributions to CP-violating effects that the model generates due to unitarity violation in the neutrino sector.
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