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Home Science & Environment

Muon Wobble Mystery Deepens as Fermilab Hits Precision Goal todayheadline

June 4, 2025
in Science & Environment
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After six years of meticulous measurements, scientists at Fermilab have delivered their final word on one of physics’ most puzzling mysteries: how much does a muon wobble in a magnetic field?

The answer, precise to 127 parts-per-billion, surpassed their original goal and represents the most accurate measurement of its kind ever achieved. Yet rather than solving the mystery, this remarkable precision has highlighted a growing divide in the theoretical physics community about what the numbers actually mean.

The Muon g-2 experiment, which concluded its data collection in 2023, focused on a fundamental particle called the muon. Think of it as electron’s heavier cousin—about 200 times more massive but sharing the same electric charge. Like tiny spinning tops, muons wobble when placed in a magnetic field, and the speed of that wobble depends on properties that should be predictable using our best theory of particle physics: the Standard Model.

A Century-Old Puzzle Gets More Precise

“For over a century, g-2 has been teaching us a lot about the nature of nature,” said Lawrence Gibbons, professor at Cornell University and analysis co-coordinator for this result. “It’s exciting to add a precise measurement that I think will stand for a long time.”

The experiment’s name comes from a simple relationship. Nearly 100 years ago, physicists predicted that a quantity called the g-factor would equal exactly 2. But experiments consistently showed it to be slightly different—by an amount called the magnetic anomaly, calculated as (g-2)/2.

This tiny deviation encodes the effects of every particle in the Standard Model, creating what physicists call a “stringent benchmark” for their understanding of fundamental physics. When the previous version of this experiment ran at Brookhaven National Laboratory in the early 2000s, it hinted at a discrepancy that could signal the existence of undiscovered particles.

The Great Theoretical Split

But here’s where the story takes an unexpected turn. While Fermilab was perfecting their measurement, theoretical physicists were grappling with their own challenge: two different methods for calculating what the muon’s wobble should be were giving different answers.

The traditional approach uses input data from other experiments. A newer computational method relies heavily on computer simulations. Recent calculations using the computational technique have moved closer to what the experiment actually measures, reducing the apparent discrepancy that once excited physicists hoping for signs of new physics.

“The anomalous magnetic moment, or g–2, of the muon is important because it provides a sensitive test of the Standard Model of particle physics,” said Regina Rameika, the U.S. Department of Energy’s Associate Director for the Office of High Energy Physics. “This is an exciting result and it is great to see an experiment come to a definitive end with a precision measurement.”

An Unusual Collaboration

What made this experiment particularly remarkable wasn’t just its precision, but the diverse expertise required to achieve it. Unlike typical high-energy physics experiments, Muon g-2 brought together scientists from multiple disciplines.

“This experiment is quite peculiar because it has very different ingredients in it,” said Marco Incagli, a physicist with the Italian National Institute for Nuclear Physics at Pisa and co-spokesperson for Muon g-2. “It is really done by a collaboration among communities that normally work on different experiments.”

The 176 scientists from 34 institutions included not just particle physicists, but also accelerator physicists, atomic physicists, and nuclear physicists. The experiment required moving Brookhaven’s massive magnetic storage ring from New York to Illinois in 2013—a logistical feat that involved careful transport of the 50-foot-diameter superconducting magnet.

Key Findings

The final experimental measurement achieved several milestones:

  • Precision of 127 parts-per-billion, exceeding the original design goal of 140 parts-per-billion
  • Analysis of the experiment’s highest-quality data from 2021-2023
  • More than tripled the dataset size compared to their 2023 result
  • Confirmation of previous measurements with unprecedented accuracy

What Happens Next?

While the main analysis has concluded, the collaboration isn’t finished mining their data. Future studies will examine the muon’s electric dipole moment and test fundamental symmetries in physics—work that could reveal new insights about the universe’s basic structure.

“This is a very exciting moment because we not only achieved our goals but exceeded them, which is not very easy for these precision measurements,” said Peter Winter, a physicist at Argonne National Laboratory and co-spokesperson for the collaboration.

A future experiment at Japan’s particle accelerator complex will likely make another measurement in the early 2030s, though initially with less precision than Fermilab achieved. Meanwhile, the theoretical physics community continues working to resolve the disagreement between their two calculation methods.

The question remains: does the muon’s wobble reveal cracks in our understanding of fundamental physics, or does it simply confirm how remarkably well our current theories work? The answer may depend on which theoretical calculation proves correct—a debate that this precise measurement has made more urgent than ever.

 

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