2017/02/28 by Tomohiro Abe · 29 citations
Physics and Astronomy · #Astrophysics #Atomic and Subatomic Physics Research #CP violation #Cosmology #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Light dark matter #Particle physics #Particle physics theoretical and experimental studies #Phenomenology (philosophy) #Physics #Pseudoscalar #Quark #Scalar field dark matter #hep-ph
paper · pdf · doi:10.1016/j.physletb.2017.05.048
published in Physics Letters B 771, 125-130 (Elsevier BV) · 13 pages, 5 figures, version accepted by PLB
openalex publication_date 2017/05/19 · arxiv created 2017/05/26 · arxiv updated 2017/05/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We revisit the singlet-doublet dark matter model with a special emphasis on the effect of CP violation on the dark matter phenomenology. The CP violation in the dark sector induces a pseudoscalar interaction of a fermionic dark matter candidate with the SM Higgs boson. The pseudoscalar interaction helps the dark matter candidate evade the strong constraints from the dark matter direct detection experiments. We show that the model can explain the measured value of the dark matter density even if dark matter direct detection experiments do not observe any signal. We also show that the electron electric dipole moment is an important complement to the direct detection for testing this model. Its value is smaller than the current upper bound but within the reach of future experiments.