Study of Two-Loop Neutrino Mass Generation Models

Understand

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.