A tiny particle's wobble could rewrite the laws of physics
In short: For over 60 years, scientists have chased a microscopic anomaly: the subtle wobble of a muon. By measuring this subatomic particle with extreme precision, researchers hope to find cracks in our current understanding of the universe and discover entirely new laws of nature.
The Muon g-2 experiment is dedicated to measuring the anomalous magnetic moment of the muon, a fundamental subatomic particle. This measurement is so sensitive that even tiny deviations from predicted values could indicate the existence of particles or forces currently missing from the Standard Model of Particle Physics—the current framework describing how the universe works at its most basic level. The experiment explores the quantum realm where particles briefly appear and vanish. These measurements are designed to test physicists' fundamental understanding of both particles and forces.
This quest for precision has spanned three generations of experiments across three major institutions: CERN in the 1970s, Brookhaven National Laboratory starting in the 1990s, and finally Fermilab. The work culminated in a final publication in 2025, providing the world’s most precise measurement to date. To achieve this, hundreds of collaborators from around the globe had to coordinate extraordinary advances in instrumentation, calibration, and data analysis. The Brookhaven phase began in 1990 and produced its first results in 2004. The subsequent Fermilab follow-up experiment ran from 2013 until the final publication date.
In recognition of these multi-decade contributions, the Muon g-2 collaboration received the 2026 Breakthrough Prize in Fundamental Physics. The $3 million award was presented on April 18, 2026, at a ceremony in Santa Monica, California. While four specific scientists accepted the prize on behalf of the group—including Chris Polly (Fermilab) and William M. Morse (Brookhaven)—the award is shared among hundreds of living co-authors who contributed to the publications across all three research sites. Argonne National Laboratory researchers were also included among the winners for their role in the final phase. The prize is one of three annual awards given in life sciences, mathematics, and fundamental physics.
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Sources
- Summary by Intellect · source: Muon g-2 wins Breakthrough Prize in Fundamental Physics
- Also: Fermilab experiment receives prestigious Breakthrough Prize in Fundamental Physics
- Also: Muon g-2 Experiment Pioneers Win Breakthrough Prize in Fundamental Physics
- Also: Muon g-2 experiment receives prestigious Breakthrough Prize in Fundamental Physics
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