Muon g-2 experiment finds strong evidence for new physics

The first results from the Muon g-2 experiment hosted at Fermilab show fundamental particles called muons behaving in a way not predicted by the Standard Model of particle physics. Announced on April 7, 2021, these results confirm and strengthen the findings of an earlier experiment of the same name performed at Brookhaven National Laboratory. Combined, the two results show strong evidence that our best theoretical model of the subatomic world is incomplete. One potential explanation would be the existence of undiscovered particles or forces. This video explains what a muon is, how the Muon g-2 experiment works, and the significance of this result.

Muon g-2 first results press release:
First results from Fermilab’s Muon g-2 experiment strengthen evidence of new physics
Fermilab home page: Muon g-2: #gminus2