2019/04/30 by Ahmad Mohamadnejad
Physics and Astronomy · #Atomic and Subatomic Physics Research #Dark Matter and Cosmic Phenomena #Dark matter #Electron #Fermion #Gauge (firearms) #Higgs boson #Lepton #Leptoquark #MAJORANA #Majorana fermion #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Planck #Quantum mechanics #Scalar (mathematics) #Standard Model (mathematical formulation) #hep-ph
paper · pdf · doi:10.1016/j.nuclphysb.2019.114793
published as Nucl.Phys. B 949 (2019) 114793 · 20 pages, 7 figures, version accepted for publication in Nuclear Physics B
openalex publication_date 2019/10/11 · arxiv created 2019/10/14 · arxiv updated 2019/10/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study a classically accidental scale-invariant extension of the Standard Model (SM) containing three additional fields, a vector leptoquark (Vμ), a real scalar (ϕ), and a neutral Majorana fermion (χ) as a dark matter (DM) candidate. The scalar ϕ (scalon) and Majorana fermion χ are both singlets under the SM gauge group, while Vμ has (3, 1, 2/3) quantum numbers under the SU(3)c×SU(2)L×U(1)Y. The Majorana DM couples to the SM sector via both Higgs and leptoquark portals. We perform a scan over the independent parameters to determine the viable parameter space consistent with the Planck data for DM relic density, and with the PandaX-II and LUX direct detection limits for the spin-independent (SI) and spin-dependent (SD) DM-nucleon cross section. The model generally evades indirect detection constraints while being consistent with collider data.