Lepton Flavor Violation in the Scotogenic Model

Abstract

We investigate lepton flavor violation in the scotogenic model proposed by Ma in which neutrinos acquire non-zero masses at the 1-loop level. Although some works exist in this direction, they have mainly focused on the radiative decay $\ell_\alpha \to \ell_\beta \gamma$. Motivated by the promising new projects involving other low-energy processes, we derive complete analytical expressions for $\ell_\alpha \to 3 \, \ell_\beta$ and $\mu-e$ conversion in nuclei, and numerically study their impact on the phenomenology. We will show that these processes can actually have rates larger than the one for $\ell_\alpha \to \ell_\beta \gamma$, thus providing more stringent constraints and better experimental perspectives.