# Well-tempered n-plet dark matter

## TL;DR

This paper explores fermionic WIMP dark matter models involving singlet and n-plet mixing, analyzing relic density production via coannihilation and the impact of current and future direct detection constraints.

## Contribution

It introduces effective models with higher-dimensional operators for fermionic dark matter involving SU(2) n-plets, and assesses their relic density and experimental constraints.

## Key findings

- Relic density can be achieved through coannihilation in certain parameter regions.
- Current direct detection experiments exclude large parts of the model parameter space.
- Next-generation experiments will further constrain or potentially discover these models.

## Abstract

We study simple effective models of fermionic WIMP dark matter, where the dark matter candidate is a mixture of a Standard Model singlet and an n-plet of SU(2) with n >= 3, stabilized by a discrete symmetry. The dark matter mass is assumed to be around the electroweak scale, and the mixing is generated by higher-dimensional operators, with a cutoff scale > 1 TeV. For appropriate values of the mass parameters and the mixing we find that the observed dark matter relic density can be generated by coannihilation. Direct detection experiments have already excluded large parts of the parameter space, and the next-generation experiments will further constrain these models.