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Here's my observation. Supposedly the annihilation of these dark matter particles produces electron-positron pairs. Since we know the approximate density of dark matter, and since we measure the rate at which the e+e- annihilation radiation is being produced, we can calculate the coupling constant for interactions between electrons and dark matter.

CPT invariance tells us that this process will also work in reverse, with the same coupling strength. We should be able to produce dark matter pairs at some calculable rate using an electron-positron collider. If the mass of the dark matter particles is around 100 MeV, we must have been producing them for quite some time: we have plenty of accelerators that can reach that energy.

If the dark matter particles don't couple to the electroweak force, the events may not distort the LEP neutrino-counting result (which measures the Z-resonance width), but they WILL throw off the "ASP" neutrino signature (single photon, missing transverse momentum).

I have performed this experiment myself, and only ever saw what was expected for three neutrino species. Is the lack of any anomalous measured signal (VERY well measured at such low masses) consistent with the coupling constant they require? Presumably that's mentioned in their paper. Until I see that, I suspend judgment.