Exploring X-Ray Lines as Scotogenic Signal

The 3.5 keV line recently detected in the X-ray spectra of certain galaxy clusters may have had a dark matter (DM) origin. We explore some of the implications of this DM interpretation of the line in the scotogenic model, where neutrinos acquire mass radiatively via one-loop interactions with DM. Assuming the line to arise from the slow decay of fermionic DM in the model, we first obtain a number of benchmark points representing the parameter space consistent with the new data and various other constraints and then make predictions on several observables in leptonic processes. They include the effective Majorana mass in neutrinoless double-beta decay, the sum of neutrino masses, and the rate of flavor-changing decay µ → eγ, as well as the cross sections of e^+e^− collisions into final states containing nonstandard particles in the model. These are testable in ongoing or future experiments and thus offer means to probe the model further