Abstract
We study the phenomenology of the inverse seesaw mechanism in the scalar-Higgs portal dark matter model. The model is an extension of the Standard Model including two additional neutrinos, a singlet scalar and a fermionic dark matter. We consider the inverse seesaw mechanism where the mass of 2 additional neutrinos are made dynamic by the singlet scalar. We found that the natural scale for the scalar vacuum expectation value is naturally close to the weak scale. Motivating by this fact, we focus on the possibility of the singlet scalar connecting with dark matter, i.e., the scalar is also the mediator between dark sector and the Standard Model. We perform a numerical analysis over the parameter space subject to the indirect and direct detection constraints. The feasible region of the parameter space will be discussed.
Highlights
The discovery of the Higgs boson in 2012, together with decades of electroweak precision tests, has been hailed as the remarkable success of the Standard Model (SM) of particle physics
We study the phenomenology of the inverse seesaw mechanism in the scalar-Higgs portal dark matter model
We consider a class of models in which the neutrino mass can be explained by the inverse seesaw mechanism
Summary
The discovery of the Higgs boson in 2012, together with decades of electroweak precision tests, has been hailed as the remarkable success of the Standard Model (SM) of particle physics. The existence of neutrino masses and dark matter (DM) strongly suggests an extension beyond the Standard Model that requires new degrees of freedom The connection between these new physics is simplistic yet tantalizing. We will consider the model in which the Dirac mass for the additional sterile neutrinos MD is explained by the dynamic of a scalar field mediator. To construct the model with the inverse seesaw mechanism, we extend the SM by adding two additional fermions: the right-handed N1 and the left-handed N2. The Lagrangian for DM is given by LDM 1⁄4 ΦχðG þ iGγ5Þχ þ Mχχ; ð5Þ where G is a coupling and Gis a pseudoscalar coupling Note that this dark sector explicitly breaks the Z2 symmetry and contains the CP violation, which will be mediated to the neutrino sector
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