In a U(1)' dark sector model, isospin-violating couplings shift both the neutrino floor and the DM exclusion bound, changing the window for light dark matter discovery.
Opening windows with Isospin-Violating Dark Matter
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abstract
We consider the effect of isospin-violating dark matter-nucleon interactions on direct detection constraints in the regime of small dark matter mass and large scattering cross section. Isospin-violation can lead to both reductions in sensitivity (due to a reduced cross section for scattering with nuclei in the detector) and enhancements in sensitivity (due to a reduced cross section for scattering in the overburden). Isospin-violating effects can thus open up some closed regions of parameter space, while closing off other regions.
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Neutrino fog in the light dark sector: the role of isospin violation
In a U(1)' dark sector model, isospin-violating couplings shift both the neutrino floor and the DM exclusion bound, changing the window for light dark matter discovery.