An E6-inspired U(1)' model is built to force dark matter scattering ratio fn/fp = -0.7, but the dark matter particle's stability argument is inconsistent with the model's own scalar content.
Results from a Search for Light-Mass Dark Matter with a P-type Point Contact Germanium Detector
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abstract
We report on several features present in the energy spectrum from an ultra low-noise germanium detector operated at 2,100 m.w.e. By implementing a new technique able to reject surface events, a number of cosmogenic peaks can be observed for the first time. We discuss several possible causes for an irreducible excess of bulk-like events below 3 keVee, including a dark matter candidate common to the DAMA/LIBRA annual modulation effect, the hint of a signal in CDMS, and phenomenological predictions. Improved constraints are placed on a cosmological origin for the DAMA/LIBRA effect.
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2019 1verdicts
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Isospin-Violating Dark Matter in the $U(1)'$ Model with $E_6$ Origin
An E6-inspired U(1)' model is built to force dark matter scattering ratio fn/fp = -0.7, but the dark matter particle's stability argument is inconsistent with the model's own scalar content.