New Muon G-2 Result Improves the Measurement by a Factor of 2

Physicists have been continuing to measure the magnetic moment of the muon G-2 particle, increasing their findings' precision by a factor of 2. Muons are fundamental particles, similar to electrons but with 200 times as much mass. In theory, the magnetic moment of a muon should equal 2. But its interactions with the quantum foam change how it moves through the Universe, and physicists at Fermilab have measured this muon interaction to differ from what the Standard Model of Particle Physics predicted.

https://news.fnal.gov/2023/08/muon-g-2-doubles-down-with-latest-measurement/