AMA | September 2024

5358.247 - 5381.989 Sean Carroll

And G-2 is a way of saying the magnetic moment of the muon. The muon is a spinning particle that So it has a magnetic field. How symmetric is that magnetic field versus how distorted is it? That's a thing that you can measure and you can predict it on the basis of the standard model. And the point is that if the muon were just a point particle all by itself, g, the magnetic moment, would be two.