It is the elephant in the room for dark-matter research: a claimed detection that is hard to believe, impossible to confirm and surprisingly difficult to explain away. Now, four instruments that will use the same type of detector as the collaboration behind the claim are in the works or poised to go online. Within three years, the experiments will be able to either confirm the existence of dark matter—or rule the claim out once and for all, say the physicists who work on them.
“This will get resolved,” says Frank Calaprice of Princeton University in New Jersey, who leads one of the efforts.
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