Physicists in Russia think they’re on the trail of a new particle that's everywhere, but nowhere.
in suburban Chicago had started to observe neutrino oscillations directly. When they did, they found discrepancies the number of neutrinos of each flavor they expected to appear and how many actually appeared.
So what would that sterile neutrino look like? The name “sterile,” and the fact that physicists haven’t detected them through the normal channels, indicate that this class of particles abstains from the weak nuclear force, too. That leaves just one way they can interact with their environment: gravity.
That held true well into the 21st century, as the anomalies were too inconsistent for physicists to tell if they amounted to sterile neutrinos. Some experiments found anomalies; others simply didn’t. The sum of experiments seemed to paint a mural of circumstantial evidence. “I think that’s how a lot of people viewed it,” says Jones. “That’s how I viewed it.”
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