Muon g-2 achieves most precise measurement of muon's magnetic anomaly

experiment has made significant strides in particle physics by achieving the most precise measurement of the muon's magnetic anomaly to date. Released on June 3, 2025, this measurement boasts an impressive precision of 127 parts per billion, exceeding the original experimental goals . The results are consistent with previous findings from earlier measurements conducted in 2021 and 2023, reinforcing the reliability of this groundbreaking study . This enhanced precision not only strengthens existing theoretical frameworks but also serves as a crucial benchmark for evaluating the Standard Model of particle physics.

Muon g-2 experiment, hosted by the U.S. Department of Energy’s Fermi National Accelerator Laboratory, have released their third and final measurement of the muon magnetic anomaly. This value is related to g-2, the experiment’s namesake measurement. The final result agrees with their published results from 2021 and 2023 but with a much better precision of 127 parts-per-billion, surpassing the original experimental design goal of 140 parts-per-billion.

“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. This is an exciting result and it is great to see an experiment come to a definitive end with a precision measurement,” said Regina Rameika, the U.S. Department of Energy’s Associate Director for the Office of High Energy Physics.

discrepancy appeared in an experiment at Brookhaven National Laboratory in Upton, N.Y. Now, Dev says, “it’s finally coming to a close.”

Muons’ magnetism causes them to wobble when traveling through a magnetic field. The Muon g−2 experiment (pronounced “g minus two”, the term used in equations to represent the anomalous magnetic moment) measured the rate of these wobbles in a giant, doughnut-shaped magnet, revealing the anomalous magnetic moment.

Japan Proton Accelerator Research Complex that’s expected to start near the end of the decade. Scientists also are still analyzing the final muon data to see if they can glean information about other mysterious entities like dark matter.

Furthermore, the implications of this measurement extend beyond mere confirmation of established theories. By probing the nuances of muon behavior under magnetic fields, scientists aim to uncover potential discrepancies that could suggest the existence of unknown particles or forces. Such discoveries could pave new avenues for research and lead to a deeper understanding of fundamental interactions within our universe. As such, the Muon g-2 experiment represents a pivotal moment in contemporary physics.

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Sara H

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