Triplet-quadruplet dark matter

We explore a dark matter model extending the standard model particle content by one fermionic su(2) l triplet and two fermionic su(2) l quadruplets, leading to a minimal realistic uv-complete model of electroweakly interacting dark matter which interacts with the higgs doublet at tree level via two kinds of yukawa couplings. after electroweak symmetry-breaking, the physical spectrum of the dark sector consists of three majorana fermions, three singly charged fermions, and one doubly charged fermion, with the lightest neutral fermion χ 1 0 serving as a dark matter candidate. a typical spectrum exhibits a large degree of degeneracy in mass between the neutral and charged fermions, and we examine the one-loop corrections to the mass differences to ensure that the lightest particle is neutral. we identify regions of parameter space for which the dark matter abundance is saturated for a standard cosmology, including coannihilation channels, and find that this is typically achieved for $$ {m}_{chi_1^0}sim 2.4 $$ tev. constraints from precision electroweak measurements, searches for dark matter scattering with nuclei, and dark matter annihilation are important, but leave open a viable range for a thermal relic.