WIMP dark matter in the parity solution to the strong CP problem

Abstract

We extend the Standard Model (SM) with parity symmetry, motivated by the strong CP problem and dark matter. In our model, parity symmetry is conserved at high energy by introducing a mirror sector with the extra gauge symmetry, SU (2) R × U (1) R . The charges of SU (2) R × U (1) R are assigned to the mirror fields in the same way as in the SM, but the chiralities of the mirror fermions are opposite to respect the parity symmetry. The strong CP problem is resolved, since the mirror quarks are also charged under the SU (3) c in the SM. In the minimal setup, the mirror gauge symmetry leads to stable colored particles which would be inconsistent with the observed data, so that we introduce two scalars in order to deplete the stable colored particles. Interestingly, one of the scalars becomes stable because of the gauge symmetry and therefore can be a good dark matter candidate. We especially study the phenomenology relevant to the dark matter, i.e. thermal relic density, direct and indirect searches for the dark matter. The bounds from the LHC experiment and the Landau pole are also taken into account. As a result, we find that a limited region is viable: the mirror up quark mass is around [600 GeV, 3 TeV] and the relative mass difference between the dark matter and the mirror up quark or electron is about O(1-10 %). We also discuss the neutrino sector and show that the right-handed neutrinos in the mirror sector can increase the effective number of neutrinos or dark radiation by 0.14.

Current status and muon g − 2 explanation of lepton portal dark matter

“…ref. [29]. In the SU(2) L doublet vectorlike lepton case, we can find the allowed region where 1 TeV m X 3 TeV.…”

“…As pointed out in ref. [29], allowing O(1%) fine-tuning between m X and m F , one should be able to find a narrow allowed region in this mass regime. In this paper, we do not focus on such a fine-tuned case.…”

“…[86] for the real DM, in ref. [29] for the complex DM, in refs. [20,43] for the Majorana DM and in ref.…”

The Type II Dirac Seesaw Portal to the mirror sector: Connecting neutrino masses and a solution to the strong CP problem

“…The presence of the bidoublet field does not change this picture as it does not couple to quarks. Reference [71] demonstrated that integrating out the heavy mirror quarks does not generate phases for the SM quark Yukawas via RGE effects. So far we have only worked at tree-level.…”

Higgs flavor phenomenology in a supersymmetric left-right model with parity

“…See also recent discussions[8][9][10][11][12] 2. The LR breaking effects from SUSY breaking should be sufficiently suppressed to solve the strong CP[17].…”