Can dark matter - electron scattering explain the DAMA annual modulation signal?

Understand

The annually modulating $\sim$ keV scintillations observed in the DAMA/NaI and DAMA/Libra experiments might be due to dark matter - electron scattering.

• Such an explanation is now favoured given the stringent constraints on nuclear recoil rates obtained by LUX, SuperCDMS and other experiments.
• We suggest that multi-component dark matter models featuring light dark matter particles of mass $\sim$ MeV can potentially explain the data.
• A specific example, kinetically mixed mirror dark matter, is shown to have the right broad properties to consistently explain the experiments via dark matter - electron scattering.