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New signs of shadow particles

Physicists analyzing data from a past experiment on electronlike particles called muons suspect that something unknown affected the particles' behavior. This sign of a shadowy influence has shown up in measurements of muons racing around a large subatomic-particle storage ring at Brookhaven National Laboratory in Upton, N.Y.

Immersed in a uniform magnetic field, muons are expected to wobble like spinning tops. However, in the new data analysis, physicists found that the muons wobbled faster than predicted by the standard model, the prevailing theory of particle physics.

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