Ultraviolet extensions of the Scotogenic model

Abstract

The Scotogenic model is a popular scenario that induces radiative Majorana neutrino masses and includes a weakly-interacting dark matter candidate. We classify all possible ultraviolet extensions of the Scotogenic model in which (i) the dark Z 2 parity emerges at low energies after the spontaneous breaking of a global U(1) L lepton number symmetry, and (ii) the low-energy effective theory contains a naturally small lepton number breaking parameter, suppressed by the mass of a heavy mediator integrated out at tree-level. We find 24 such models and discuss two of them in detail to illustrate our setup. We also discuss some general aspects of the phenomenology of the models in our classification, exploring possible lepton flavor violating signals, collider signatures and implications for dark matter. The phenomenological prospects of these scenarios are very rich due to the presence of additional scalar states, including a massless Goldstone boson.

Fermion Dark Matter in Dynamical Scotogenic Model

“…Depending on the mass hierarchy between η and N , the DM in this model can either be fermionic N or bosonic η. This strong connection between DM and neutrino mass generation has led to many interesting studies [8][9][10][11][12][13][14][15][16][17]. The other appealing variation of the Scotogenic model is referred as dynamical Scotogenic extension [13,18], which in addition to η and N 's also contains another SU (3) c ⊗ SU (2) L ⊗ U (1) Y singlet scalar σ.…”