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.
Multicomponent Dark Matter from Gauge Symmetry
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abstract
The composition of Dark Matter (DM) remains an important open question. The current data do not distinguish between single- and multi-component DM, while in theory constructions it is often assumed that DM is composed of a single field. In this work, we study a hidden sector which naturally entails multicomponent DM consisting of spin-1 and spin-0 states. This UV complete set-up is based on SU(3) hidden gauge symmetry with the minimal scalar field content to break it spontaneously. The presence of multiple DM components is a result of a residual Z_2 x Z'_2 symmetry which is part of an unbroken global U(1) x Z'_2 inherent in the Yang-Mills systems. We find that the model exhibits various parametric regimes with drastically different DM detection prospects. In particular, we find that the direct detection cross section is much suppressed in large regions of parameter space as long as the Standard Model Higgs mixes predominantly with a single scalar from the hidden sector. The resulting scattering rate is often beyond the level of sensitivity of XENON1T, while still being consistent with the thermal WIMP paradigm.
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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.