Physicists at Fermilab have made the most precise measurement ever of a long-disputed value – the magnetic 'wiggle' of an elementary particle known as a muon.

In somewhat disappointing news, that measurement is in strong agreement with the Standard Model , meaning it probably isn't hiding any exotic new physics as some had hoped.

A muon is similar to an electron, except it's about 207 times more massive. The way muons move in a magnetic field should theoretically be very predictable, summed up in what's called its gyromagnetic ratio, or g.

In a simple world, the value of g should be a nice, neat 2 – but of course, that would be too easy. The muon's magnetic dance is something of an anomaly, and in the same way that pi is just a touch over 3, the muon's g-factor seemed to be very

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