In the 2HD+a model with near-zero A-a mixing, single-component WIMP dark matter naturally lies below the neutrino floor above 100 GeV while two-component scenarios are largely excluded by current bounds.
Pseudoscalar Mediators: A WIMP model at the Neutrino Floor
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abstract
Due to its highly suppressed cross section (fermionic) dark matter interacting with the Standard Model via pseudoscalar mediators is expected to be essentially unobservable in direct detection experiments. We consider both a simplified model and a more realistic model based on an extended two Higgs doublet model and compute the leading one-loop contribution to the effective dark matter- nucleon interaction. This higher order correction dominates the scattering rate completely and can naturally, i.e. for couplings of order one, lead to a direct detection cross section in the vicinity of the neutrino floor. Taking the observed relic density and constraints from low-energy observables into account we analyze the direct detection prospects in detail and find regions of parameter space that are within reach of upcoming direct detection experiments such as XENONnT, LZ, and DARWIN.
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A dark matter fermion is shown to simultaneously explain the relic density, satisfy direct detection and collider bounds, and produce observable rates for muon-to-electron transitions in a viable parameter region.
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Charting Dark Matter down to the neutrino floor/fog in the 2HD+a scenario
In the 2HD+a model with near-zero A-a mixing, single-component WIMP dark matter naturally lies below the neutrino floor above 100 GeV while two-component scenarios are largely excluded by current bounds.
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Dark Matter as a Source for Lepton Flavor Violation
A dark matter fermion is shown to simultaneously explain the relic density, satisfy direct detection and collider bounds, and produce observable rates for muon-to-electron transitions in a viable parameter region.