Phenomenology of scotogenic scalar dark matter
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Regular Article - Theoretical Physics
Phenomenology of scotogenic scalar dark matter Ivania M. Ávila1,2,a , Valentina De Romeri2,b , Laura Duarte2,3,c , José W. F. Valle2,d 1
Instituto de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna, 4860 Santiago de Chile, Chile AHEP Group, Institut de Física Corpuscular, CSIC/Universitat de València, Parc Científic de Paterna, C/ Catedrático José Beltrán, 2, 46980 Paterna, Valencia, Spain 3 Departamento de Física e Química, Universidade Estadual Paulista (UNESP), Guaratinguetá, SP, Brazil
2
Received: 25 February 2020 / Accepted: 16 September 2020 © The Author(s) 2020
Abstract We reexamine the minimal Singlet + Triplet Scotogenic Model, where dark matter is the mediator of neutrino mass generation. We assume it to be a scalar WIMP, whose stability follows from the same Z2 symmetry that leads to the radiative origin of neutrino masses. The scheme is the minimal one that allows for solar and atmospheric mass scales to be generated. We perform a full numerical analysis of the signatures expected at dark matter as well as collider experiments. We identify parameter regions where dark matter predictions agree with theoretical and experimental constraints, such as neutrino oscillations, Higgs data, dark matter relic abundance and direct detection searches. We also present forecasts for near future direct and indirect detection experiments. These will further probe the parameter space. Finally, we explore collider signatures associated with the mono-jet channel at the LHC, highlighting the existence of a viable light dark matter mass range.
1 Introduction After the discovery of the Higgs boson, the particle physics community is eager to discover new phenomena, that would imply physics beyond the Standard Model (SM). Together with the evidence for dark matter, neutrino physics remains as the most solid indication of new physics. Neutrino experiments point towards two different neutrino mass squared differences, associated to solar and atmospheric oscillations. Hence, at least two of the three active neutrino species must be massive. Here we adopt the minimal picture in which one of the neutrinos is (nearly) massless. This is achieved in “missing partner” seesaw mechanisms [1] where one of the a e-mail:
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“left-handed” neutrinos fails to pair-off.1 The presence of a massless neutrino has a very simple and clear implication concerning neutrinoless double beta (0ν2β) decay. Indeed, if the lightest neutrino is massless, there is only one physical Majorana phase, and the effective mass parameter characterizing the amplitude for 0ν2β decay has a lower limit, even for a normal neutrino mass ordering, as currently preferred by oscillation data [3,4]. This is in sharp contrast to the standard three-massive-neutrino-scenario in which there can be in general a destructive interference amongst the three light neutrinos (such cancellation in
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