Accidental composite dark matter

Abstract

Abstract:We build models where Dark Matter candidates arise as composite states of a new confining gauge force, stable thanks to accidental symmetries. Restricting to renormalizable theories compatible with SU(5) unification, we find 13 models based on SU(N ) gauge theories and 9 based on SO(N ). We also describe other models that require non-renormalizable interactions. The two gauge groups lead to distinctive phenomenologies: SU(N ) theories give complex DM, with potentially observable electric and magnetic dipole moments that lead to peculiar spin-independent cross sections; SO(N ) theories give real DM, with challenging spin-dependent cross sections or inelastic scatterings. Models with Yukawa couplings also give rise to spin-independent direct detection mediated by the Higgs boson and to electric dipole moments for the electron. In some models DM has higher spin. Each model predicts a specific set of lighter composite scalars, possibly observable at colliders.

What is the γγ resonance at 750 GeV?

“…These models were already considered in the past as ways of dynamically inducing the electroweak scale [45], and as ways of obtaining composite dark matter [60]. Explicit fundamental models can be easily written down.…”

“…This theory contains acceptable techni-baryon DM candidates and could achieve SM gauge couplings unification around 10 17 GeV [60]. The techni-strong dynamics…”

Composite accidental axions

“…Anomaly coefficients for the axion singlet in SU(N c ) models with various choices of reps of SM fermions. We use the notation as in [5].…”

“…The other terms that can break explicitly the global symmetries are baryon operators. 5 From a fundamental representation we can build a singlet of SU(N c ) using the tensor with N c fermions. A singlet under the SM can be constructed multiplying together various of these terms.…”

“…Models where dark matter is accidentally stable can be constructed using a new gauge theory, see [5].…”