Abstract
We consider models with fermionic dark matter that transforms under a non-Abelian dark gauge group. Exotic, vectorlike leptons that also transform under the dark gauge group can mix with standard model leptons after spontaneous symmetry breaking and serve as a portal between the dark and visible sectors. We show in an explicit, renormalizable model based on a dark SU(2) gauge group how this can lead to adequate dark matter annihilation to a standard model lepton flavor so that the correct relic density is obtained. We identify a discrete symmetry that allows mass mixing between the vectorlike fermions and a single standard model lepton flavor, while preventing mixing between these fields and the remaining standard model leptons. This flavor sequestering avoids unwanted lepton-flavor-violating effects, substantially relaxing constraints on the mass scale of the vectorlike states. We discuss aspects of the phenomenology of the model, including direct detection of the dark matter.
Highlights
The literature on dark matter models is vast and diverse, the organizational structure of many of these models is similar
The visible sector includes all the fields normally associated with the minimal standard model; the dark sector consists of a collection of fields that communicate very weakly with the visible sector; the messenger or portal sector consists of those fields that allow for a weak coupling between the visible and dark sectors
We are interested in a possible portal for dark matter models, ones in which fermionic dark matter is charged under a dark gauge group
Summary
The literature on dark matter models is vast and diverse, the organizational structure of many of these models is similar. In our proposal, mixing between the vectorlike and standard model fermions will only be present when the non-Abelian dark gauge group is spontaneously broken Given these assumptions, we would like the vectorlike fermion portal in our model to allow the dark gauge bosons to develop a small coupling to the visible sector, adequate enough to facilitate the annihilation of the dark matter for a. While the proliferation of fields implied by these considerations does not rise to the level of a no-go theorem, it does make the approach described a lot less appealing To avoid these complications, we assume that the nonAbelian dark gauge boson may couple to a vectorlike state χ that can mix with standard model leptons after the gauge symmetries of the theory (both dark and visible) are spontaneously broken.
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