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.
Isospin-violating dark-matter-nucleon scattering via two-Higgs-doublet-model portals
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abstract
We show that in a multi-Higgs model in which one Higgs fits the LHC 125 GeV state, one or more of the other Higgs bosons can mediate DM-nucleon interactions with maximal DM isospin violation being possible for appropriate Higgs-quark couplings, independent of the nature of DM. We then consider the explicit example of a Type II two-Higgs-doublet model, identifying the h or H as the 125 GeV state while the H or h, respectively, mediates DM-nucleon interactions. Finally, we show that if a stable scalar, S, is added then it can be a viable light DM candidate with correct relic density while obeying all direct and indirect detection limits.
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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.