Abstract
A light fermionic weakly interacting massive particle (WIMP) dark matter is investigated by studying its minimal renormalizable model, where it requires a scalar mediator to have an interaction between the WIMP and standard model particles. We perform a comprehensive likelihood analysis of the model involving the latest but robust constraints and those will be obtained in the near future. In addition, we pay particular attention to properly take the kinematically equilibrium condition into account. It is shown that near-future experiments and observations such as low-mass direct dark matter detections, flavor experiments and CMB observations play important roles to test the model. Still, a wide parameter region will remain even if no WIMP and mediator signals are detected there. We also show that precise Higgs boson measurements at future lepton colliders will significantly test this remaining region.
Highlights
In past decades, people tried to develop particle physics based on the electroweak naturalness [1, 2], namely how the electroweak scale should be naturally explained
We have studied a minimal model with a light fermionic weakly interacting massive particle (WIMP) and a light scalar mediator whose decay width is computed with uncertainties from non-perturbative QCD effects properly taken into account
In order to investigate the present status and future prospects of the light WIMP and the light scalar mediator, we have performed a comprehensive likelihood analysis involving all robust constraints obtained so far. We discuss those future sensitivities which will be obtained in the near future from particle physics experiments as well as cosmological and astrophysical observations
Summary
People tried to develop particle physics based on the electroweak naturalness [1, 2], namely how the electroweak scale should be naturally explained. In the minimal (renormalizable) model to describe such a light fermionic WIMP, a new additional particle called the mediator must be introduced to have an interaction between the WIMP and SM particles Such a mediator is required to be as light as the WIMP to explain the dark matter abundance observed today, to be singlet under the SM gauge group to avoid constraints from the current performed collider experiments, to be bosonic being consistent with the Lorentz symmetry, and to be even under the Z2 symmetry in order to make the WIMP stable. There are several appendices at the end of this paper, where preselection criteria we have involved in our analysis (appendix A), the kinematical equilibrium condition (appendix B) and results of our analysis (appendix C) are shown in details
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