Muon magnetism update

Last year, an experiment suggested that the muon — a subatomic particle similar to an electron — had inexplicably strong magnetism, possibly breaking a decades-long streak of victories for the leading theory of particle physics, known as the standard model. Now, revised calculations by several groups suggest that the theory’s prediction of muon magnetism might not be too far from the experimental prediction after all. By narrowing the gap, the latest predictions might make it easier to resolve the discrepancy between theory and experiment.