Physicists Solve a Big Quantum Mystery. Now, Old Results Don’t Add Up.

For 25 years, physicists have been puzzled by an apparent one-part-in-a-million problem. Their expectations of the way that certain particles should wobble in a magnetic field were clashing with what they saw in experiments. The discrepancy was an electrifying hint that they might be seeing evidence of unknown particles. Then in 2021, that hint seemed to evaporate. When researchers updated the…

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