Study of Two-Loop Neutrino Mass Generation Models

Abstract

We study the models with the Majorana neutrino masses generated radiatively by two-loop diagrams due to the Yukawa $\rho {\bar{\ell }}_R^c{\ell }_R$ and effective ${\rho }^{\pm \pm }{W}^{\mp }{W}^{\mp }$ couplings along with a scalar triplet $\Delta$, where $\rho$ is a doubly charged singlet scalar, ${\ell }_R$ the charged lepton and $W$ the charged gauge boson. A generic feature in these types of models is that the neutrino mass spectrum has to be a normal hierarchy. Furthermore, by using the neutrino oscillation data and comparing with the global fitting result in the literature, we find a unique neutrino mass matrix and predict the Dirac and two Majorana CP phases to be $1.40\pi$, $1.11\pi$ and $1.47\pi$, respectively. We also discuss the model parameters constrained by the lepton flavor violating processes and electroweak oblique parameters. In addition, we show that the rate of the neutrinoless double beta decay $(0\nu \beta \beta )$ can be as large as the current experimental bound as it is dominated by the short-range contribution at tree level, whereas the traditional long-range one is negligible.

20 pages, 3 figures

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• Loop suppressed light fermion masses with $U(1{)}_R$ gauge symmetry
• A model of neutrino mass and dark matter with large neutrinoless double beta decay
• Radiative Seesaw Model with Degenerate Majorana Dark Matter
• From high-scale leptogenesis to low-scale one-loop neutrino mass generation
• Neutrino mass in flavor dependent gauged lepton model