Abstract
We build models where Dark Matter candidates arise as composite states of a new conning gauge force, stable thanks to accidental symmetries. Restricting to renormalizable theories compatible with SU(5) unication, wend 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 phenomenolo- gies: 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 specic set of lighter composite scalars, possibly observable at colliders.
Highlights
Idea can be minimally realized by adding to the SM one extra multiplet that cannot have any Yukawa interaction with SM particles, and that contains a DM candidate ([1, 2]; a different proposal to get accidentally stable DM was presented by [3])
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
Composite Dark Matter has been rarely considered in the literature, and mostly in models with different goals, e.g. with supersymmetry [5], with composite [6,7,8,9] or partially composite Higgs [10,11,12], with a mirror-SM sector [13] or quirks [14] or a fourth generation [15] as well as from a phenomenological point of view, in order to realise special situations often motivated by anomalies [16,17,18,19,20]
Summary
In [22] we considered composite dark matter theories in the limit of massless techni-quarks. With masses (such that the CP-violating θTC angle becomes physical) the theory has a few more free parameters, that significantly affect its phenomenology. From a phenomenological point of view, we are mostly interested in checking that a successful TCb. DM candidate is the lightest TCb and in computing its interactions. The main new feature relevant for DM direct detection is that DM TCb fermion has magnetic and electric dipoles with moments. A magnetic moment with order 1 gyro-magnetic ratio is typical of composite states. The smaller electric dipole is generated when CP is violated by a non-zero θTC. Chromodipoles are generated in models with colored constituents
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