Relic Challenges for Vector-Like Fermions as Connectors to a Dark Sector

Abstract

New dark sectors consisting of exotic fields that couple only very feebly to the Standard Model (SM) have strong theoretical motivation and may be relevant to explaining the abundance of dark matter (DM). An important question for such sectors is how they connect to the SM. For a dark sector with a new gauge interaction, a natural connection arises from heavy vector-like fermions charged under both the visible and dark gauge groups. The gauge charges of such fermions imply that one or more of them is stable in the absence of additional sources of dark symmetry breaking. A generic challenge for such connectors is that they can produce too much dark matter or interact too strongly with nuclei if they were ever thermalized in the early universe. In this paper we study this challenge in a simple connector theory consisting of new vector-like electroweak doublet and singlet fermions that also transform under the fundamental representation of a new (Abelian) gauge force, and we show that these connectors in their minimal form are almost always ruled out by existing direct DM searches. To address this challenge, we investigate two solutions. First, we study mitigating scattering on nuclei by introducing a Majorana mass term for the singlet. And second, we investigate a mixing with SM leptons that allows the connectors to decay while remaining consistent with cosmological tests and searches for charged lepton flavor violation. Both solutions rely on the presence of a dark Higgs field with a specific charge.

arXiv comment32 pages, 5 figures, added references, corrected plotting error, conclusions unchanged

References in corpus (87)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Supersymmetric Dark Matter
• Asymptotic formulae for likelihood-based tests of new physics
• FeynRules 2.0 - A complete toolbox for tree-level phenomenology
• A Theory of Dark Matter
• UFO - The Universal FeynRules Output
• Secluded WIMP Dark Matter
• The Physics of Heavy Z' Gauge Bosons
• FeynRules - Feynman rules made easy
• Minimal Dark Matter
• Four-dimensional String Compactifications with D-Branes, Orientifolds and Fluxes
• Echoes of a Hidden Valley at Hadron Colliders
• Big-Bang Nucleosynthesis and Hadronic Decay of Long-Lived Massive Particles
• Inelastic Dark Matter
• Secluded U(1) below the weak scale
• New Fixed-Target Experiments to Search for Dark Gauge Forces
• Lepton-Flavor Violation via Right-Handed Neutrino Yukawa Couplings in Supersymmetric Standard Model
• Scalar Dark Matter candidates
• Cosmological Relaxation of the Electroweak Scale
• Cosmology and Astrophysics of Minimal Dark Matter
• Astrophysical Signatures of Secluded Dark Matter
• CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
• Big Bang Nucleosynthesis Constraints on Hadronically and Electromagnetically Decaying Relic Neutral Particles
• Particle decays during the cosmic dark ages
• Illuminating Dark Photons with High-Energy Colliders
• Long-Lived Particles at the Energy Frontier: The MATHUSLA Physics Case
• Intersecting Brane Worlds
• FASER's Physics Reach for Long-Lived Particles
• Detecting Dark Matter Annihilation with CMB Polarization : Signatures and Experimental Prospects
• Non-Abelian Dark Sectors and Their Collider Signatures
• LHC Signals for a SuperUnified Theory of Dark Matter
• Probing a Secluded U(1) at B-factories
• Feebly-Interacting Particles:FIPs 2020 Workshop Report
• Phenomenology of Hidden Valleys at Hadron Colliders
• Search for $A^{\prime }\to {\mu }^{+}{\mu }^{-}$ decays
• General Constraints on Dark Matter Decay from the Cosmic Microwave Background
• Revisiting Big-Bang Nucleosynthesis Constraints on Long-Lived Decaying Particles
• Indirect Dark Matter Signatures in the Cosmic Dark Ages II. Ionization, Heating and Photon Production from Arbitrary Energy Injections
• Probing Dark Forces and Light Hidden Sectors at Low-Energy e+e- Colliders
• A Stueckelberg Extension of the Standard Model
• Lepton Flavor Violation in the Scotogenic Model
• Sommerfeld factor for arbitrary partial wave processes
• Coannihilation Effects and Relic Abundance of Higgsino-Dominant LSPs
• The Sommerfeld enhancement for dark matter with an excited state
• MadDM v.3.0: a Comprehensive Tool for Dark Matter Studies
• Singlet-Doublet Dark Matter
• Discovering Inelastic Thermal-Relic Dark Matter at Colliders
• Inelastic Dark Matter at the LHC Lifetime Frontier: ATLAS, CMS, LHCb, CODEX-b, FASER, and MATHUSLA
• The Search for Feebly-Interacting Particles
• Dark Side of Higgs Diphoton Decays and Muon g-2
• The Price of Tiny Kinetic Mixing
• Hidden Higgs Decaying to Lepton Jets
• Probing MeV Dark Matter at Low--Energy $e^{+}{e}^{-}$ Colliders
• MadDM v.1.0: Computation of Dark Matter Relic Abundance Using MadGraph5
• Terrestrial and Solar Limits on Long-Lived Particles in a Dark Sector
• Global Electroweak Fit and Vector-Like Leptons in Light of the Cabibbo Angle Anomaly
• Colored Dark Matter
• Lepton Jets in (Supersymmetric) Electroweak Processes
• Minimal Models for Dark Matter and the Muon g-2 Anomaly
• The Inelastic Frontier: Discovering Dark Matter at High Recoil Energy
• Dark Matter CMB Constraints and Likelihoods for Poor Particle Physicists
• Cosmological Constraints on Decoupled Dark Photons and Dark Higgs
• Direct Detection of Dark Matter with MadDM v.2.0
• Discovering Higgs Decays to Lepton Jets at Hadron Colliders
• PAMELA, DAMA, INTEGRAL and Signatures of Metastable Excited WIMPs
• LHC Signatures of a Minimal Supersymmetric Hidden Valley
• Light dark Higgs boson in minimal sub-GeV dark matter scenarios
• New Limits on Light Hidden Sectors from Fixed-Target Experiments
• Searching for Dark Photons with Maverick Top Partners
• Hidden sector explanation of $B$-decay and cosmic ray anomalies
• Kinetic Mixing and Portal Matter Phenomenology
• Electroweakino constraints from LHC data
• Superconformal Technicolor
• Non-Decoupling New Particles
• Multi-component Dark Matter through a Radiative Higgs Portal
• Challenges for models with composite states
• Electroweak Symmetry Breaking in the DSSM
• Towards A UV-Model of Kinetic Mixing and Portal Matter
• The Search for Electroweakinos
• Effective Field Theory of Stückelberg Vector Bosons
• Pushing the frontier of WIMPy inelastic dark matter: journey to the end of the periodic table
• Constraints on the relaxion mechanism with strongly interacting vector-fermions
• Strongly Interacting Neutrino Portal Dark Matter
• Neutrino lines from DM decay induced by high-scale seesaw interactions
• Searching for the Higgsino-Bino Sector at the LHC
• Higgs Boson Decays to Dark Photons through the Vectorized Lepton Portal
• Dark sector portal with vector-like leptons and flavor sequestering

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• Towards UV-Models of Kinetic Mixing and Portal Matter III: Relating Portal Matter and R-H Neutrino Masses
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