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The Scotogenic Model is one of the most minimal models to account for bothneutrino masses and dark matter (DM). In this model, neutrino masses aregenerated at the one-loop level, and in principle, both the lightest fermionsinglet and the lightest neutral component of the scalar doublet can be viableDM candidates. However, the correct DM relic abundance can only be obtained insomewhat small regions of the parameter space, as there are strong constraintsstemming from lepton flavour violation, neutrino masses, electroweak precisiontests and direct detection. For the case of scalar DM, a sufficiently largelepton-number-violating coupling is required, whereas for fermionic DM,coannihilations are typically necessary. In this work, we study how the newscalar singlet modifies the phenomenology of the Scotogenic Model, particularlyin the case of scalar DM. We find that the new singlet modifies both thephenomenology of neutrino masses and scalar DM, and opens up a large portion ofthe parameter space of the original model.

The ScotoSinglet Model: A Scalar Singlet Extension of the Scotogenic Model