Three-loop model of neutrino mass with dark matter (original) (raw)

Three-Loop Neutrino Mass Models at Colliders

In this work, we report on recent analyses of a class of models that generate neutrino mass at the three-loop level. We argue that these models offer a viable solution to both the neutrino mass and dark matter problems, without being in conflict with experimental constraints from, e.g. lepton flavor violating processes and the muon anomalous magnetic moment. Furthermore, we describe observable experimental signals predicted by the models and show that they have common signatures that can be probed at both the LHC and ILC.

A model of radiative neutrino mass: with or without dark matter

Journal of High Energy Physics, 2014

We present a three-loop model of neutrino mass whose most-general Lagrangian possesses a softly-broken accidental Z 2 symmetry. In the limit that a single parameter vanishes, λ → 0, the Z 2 symmetry becomes exact and the model contains a stable dark-matter candidate. However, even for finite λ ≪ 1, long-lived dark matter is possible, giving a unified solution to the neutrino mass and dark matter problems that does not invoke a new symmetry. Taken purely as a neutrino mass model, the new physics can be at the TeV scale. When dark matter is incorporated, however, only a singlet scalar can remain this light, though the dark matter can be tested in direct-detection experiments.

A model of neutrino mass and dark matter with an accidental symmetry

Physics Letters B, 2015

We present a model of radiative neutrino mass that automatically contains an accidental Z2 symmetry and thus provides a stable dark matter candidate. This allows a common framework for the origin of neutrino mass and dark matter without invoking any symmetries beyond those of the Standard Model. The model can be probed by direct-detection experiments and µ → e + γ searches, and predicts a charged scalar that can appear at the TeV scale, within reach of collider experiments.

A critical analysis of one-loop neutrino mass models with minimal dark matter

Physics Letters B, 2016

A recent paper investigated minimal RνMDM models with the type T1-iii and T3 one-loop topologies. However, the candidate most-minimal model does not possess an accidental symmetry-the scalar potential contains an explicit symmetry breaking term, rendering the dark matter unstable. We present two models that cure this problem. However, we further show that all of the proposed minimal one-loop RνMDM models suffer from a second problem-an additional source of explicit Z 2 symmetry breaking in the Yukawa sector. We perform a more-general analysis to show that neutrino mass models using either the type T3 or type T1-iii one-loop topologies do not give viable minimal dark matter candidates. Consequently, one-loop models of neutrino mass with minimal dark matter do not appear possible. Thus, presently there remains a single known (three-loop) model of neutrino mass that gives stable dark matter without invoking any new symmetries.

Models with radiative neutrino masses and viable dark matter candidates

Journal of High Energy Physics, 2013

We provide a list of particle physics models at the TeV-scale that are compatible with neutrino masses and dark matter. In these models, the Standard Model particle content is extended with a small number (≤ 4) of scalar and fermion fields transforming as singlets, doublets or triplets under SU (2), and neutrino masses are generated radiatively via 1-loop diagrams. The dark matter candidates are stabilized by a Z 2 symmetry and are in general mixtures of the neutral components of such new multiplets. We describe the particle content of each of these models and determine the conditions under which they are consistent with current data. We find a total of 35 viable models, most of which have not been previously studied in the literature. There is a great potential to test these models at the LHC not only due to the TeV-scale masses of the new fields but also because about half of the viable models contain particles with exotic electric charges, which give rise to background-free signals. Our results should serve as a first step for detailed analysis of models that can simultaneously account for dark matter and neutrino masses.

Model for neutrino masses and dark matter

Physical Review D, 2003

We propose a model for neutrino masses that simultaneously results in a new dark matter candidate, the right-handed neutrino. We derive the dark matter abundance in this model, show how the hierarchy of neutrino masses is obtained, and verify that the model is compatible with existing experimental results. The model provides an economical method of unifying two seemingly separate puzzles in contemporary particle physics and cosmology.

The Cocktail Model: Neutrino Masses and Mixings with Dark Matter

We construct a minimal model that naturally generates small neutrino masses and provides a dark matter candidate. The symmetry making the dark matter particle stable simultaneously suppresses neutrino masses to appear first at 3-loop level. This provides an elegant explanation for the observed mass hierarchy m_nu/v ~ 10^-13, without introducing right-handed neutrinos. The dark matter particle is part of an inert scalar doublet that plays a crucial role in the radiative neutrino mass generation. The model gives distinct predictions: normal neutrino mass hierarchy, a flavour mixing angle theta_13 ~ 7 - 11 degrees, new charged scalars at around the electroweak scale and a dark matter candidate in the mass range 50 to 75 GeV.

Doublet-triplet dark matter with neutrino masses

Physical Review D

We consider a dark matter (DM) model that arises from the interplay of two renormalizable dark matter models, namely the doublet-triplet fermion model and the doublet-triplet scalar model. Despite being excellent exponents of the WIMP paradigm, the physics related to DM in each of these models fails at the same time to account for neutrino masses. It turns out that from the combination of these two models it is possible to generate neutrino masses at one-loop level in the four topologies that are realizations of the Weinberg operator for neutrino masses at one loop. In this work, we combine both models focusing mostly on fermionic dark matter lying at the electroweak scale. We analyze the impact of the extra charged fields on the Higgs diphoton decay and find that, thanks to the presence of the charged scalars, it is possible to have a viable DM region at the electroweak scale.

A radiative model for the weak scale and neutrino mass via dark matter

Journal of High Energy Physics, 2016

We present a three-loop model of neutrino mass in which both the weak scale and neutrino mass arise as radiative effects. In this approach, the scales for electroweak symmetry breaking, dark matter, and the exotics responsible for neutrino mass, are related due to an underlying scale-invariance. This motivates the otherwise-independent O(TeV) exotic masses usually found in three-loop models of neutrino mass. We demonstrate the existence of viable parameter space and show that the model can be probed at colliders, precision experiments, and dark matter direct-detection experiments.