2014/11/11 by Giorgio Arcadi, Yann Mambrini, Francois Richard · 86 citations
Physics and Astronomy · #Atomic and Subatomic Physics Research #CMB cold spot #Dark Matter and Cosmic Phenomena #Dark matter #Fermi Gamma-ray Space Telescope #Higgs boson #Light dark matter #Particle physics theoretical and experimental studies #Physics beyond the Standard Model #Scalar field dark matter #Standard Model (mathematical formulation) #Weakly interacting massive particles #hep-ph
paper · pdf · doi:10.1088/1475-7516/2015/03/018
published in Journal of Cosmology and Astroparticle Physics 2015(03), 018 (Institute of Physics) · 19 pages, 7 figures
arxiv created 2014/11/11 · openalex publication_date 2015/03/11 · arxiv updated 2015/06/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We propose to generalize the extensions of the Standard Model where the Z boson serves as a mediator between the Standard Model sector and the dark sector χ. We show that, like in the Higgs portal case, the combined constraints from the recent direct searches restrict severely the nature of the coupling of the dark matter to the Z boson and set a limit m χ ≳ 200 GeV (except in a very narrow region around the Z -pole region). Using complementarity between spin dependent, spin independent and FERMI limits, we predict the nature of this coupling, more specifically the axial/vectorial ratio that respects a thermal dark matter coupled through a Z -portal while not being excluded by the current observations. We also show that the next generation of experiments of the type LZ or XENON1T will test Z-portal scenario for dark matter mass up to 2 TeV . The condition of a thermal dark matter naturally predicts the spin-dependent scattering cross section on the neutron to be σ SD χ n ≃ 10 −40 cm 2 , which then becomes a clear prediction of the model and a signature testable in the near future experiments.