Exploring X-Ray Lines as Scotogenic Signals

Abstract

We consider some implications of X-ray lines from certain astronomical objects as potential effects of dark matter decay in the context of the scotogenic model, where neutrinos acquire mass radiatively via one-loop interactions with dark matter. As an example, we focus on the 3.5 keV line recently detected in the X-ray spectra of galaxy clusters, assuming that it stands future scrutiny. We explore the scenario in which the line originates from the slow decay of fermionic dark matter in the model. After obtaining a number of benchmark points representing the parameter space consistent with the new data and various other constraints, we 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 mu -> e gamma, 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 scotogenic scenario studied.

12 pages, no figures, slightly revised, references added, main conclusions unchanged, journal version

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Cited by in corpus (5)

• From the trees to the forest: a review of radiative neutrino mass models
• A Fresh Look at keV Sterile Neutrino Dark Matter from Frozen-In Scalars
• Non-abelian Dark Matter Solutions for Galactic Gamma-ray Excess and Perseus 3.5 keV X-ray Line
• Displaced Vertices from X-ray Lines
• Predictive Scotogenic Model with Flavor Dependent Symmetry