Fermilab

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A visual representation of the muon's magnetic moment, with theoretical physics equations and experimental particle tracks converging, illustrating the resolution of a long-standing scientific mystery.

Muon Magnetic Moment Mystery Shrinks as Theory Catches Up

A decade-long quest for 'new physics' at Fermilab, fueled by a tiny wobble in a subatomic particle, has just seen its most promising lead significantly shrink.

David Grossman·July 30, 2026