Abstract
We study the dark matter phenomenology of scotogenic frameworks through a rather illustrative model extending the Standard Model by scalar and fermionic singlets and doublets. Such a setup is phenomenologically attractive since it provides the radiative generation of neutrino masses, while also including viable candidates for cold dark matter. We employ a Markov Chain Monte Carlo algorithm to explore the associated parameter space in view of numerous constraints stemming from the Higgs mass, the neutrino sector, dark matter, and lepton-flavour violating processes. After a general discussion of the results, we focus on the case of fermionic dark matter, which remains rather uncovered in the literature so far. We discuss the associated phenomenology and show that in this particular case a rather specific mass spectrum is expected with fermion masses just above 1 TeV. Our study may serve as a guideline for future collider studies.
Highlights
Particle physics beyond the Standard Model (BSM) is well motivated by many arguments from both theory considerations and experimental observations.Among the latter, three important observations clearly call for new physics
We study the dark matter phenomenology of scotogenic frameworks through a rather illustrative model extending the Standard Model by scalar and fermionic singlets and doublets
After a discussion of the couplings and the constraints from the lepton and neutrino sectors, we will in particular focus on the resulting dark matter phenomenology
Summary
Particle physics beyond the Standard Model (BSM) is well motivated by many arguments from both theory considerations and experimental observations. The generation of neutrino masses necessarily comes along with lepton-flavour violating effects, which may contribute to experimentally constrained processes, such as, e.g., the decay μ → eγ and related leptonic transitions Precision measurements of such transitions may put stringent constraints on the parameter space, especially concerning coupling parameters involved in the neutrino mass generation and dark matter phenomenology. [22] that includes both scalar and fermionic singlets and doublets This model features two non-vanishing neutrino masses generated through radiative contributions and offers three different candidates for WIMP dark matter. In order to efficiently include all relevant constraints and explore the large parameter space, we rely on a Markov Chain Monte Carlo algorithm To our knowledge, this is the first application of this technique to models aiming at explaining neutrino mass generation.
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