Study of Two-Loop Neutrino Mass Generation Models

We study the models with the Majorana neutrino masses generated radiatively by two-loop diagrams due to the Yukawa $ρ\bar \ell_R^c \ell_R$ and effective $ρ^{\pm\pm} W^\mp W^\mp$ couplings along with a scalar triplet $Δ$, where $ρ$ 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 $1.40π$, $1.11π$ and $1.47π$, 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 $(0νββ)$ 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.

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