Physicists in Japan say they have a solution to a problem that has puzzled particle physicists for nearly two decades – the anomalous magnetic moment of the muon.
Measurements made over several years at the at the g-2 experiment at the US’s Brookhaven National Laboratory suggest that the muon magnetic moment is significantly larger than predicted by the Standard Model of particle physics. After careful analysis of data related to the decay of the muon to an electron, the statistical significance of this discrepancy is at 3.6σ – which means that it is extremely unlikely to be a fluke.
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