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American Focus > Blog > Tech and Science > A Blockbuster ‘Muon Anomaly’ May Have Just Disappeared
Tech and Science

A Blockbuster ‘Muon Anomaly’ May Have Just Disappeared

Last updated: June 9, 2025 12:35 pm
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A Blockbuster ‘Muon Anomaly’ May Have Just Disappeared
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In the world of particle physics, the Standard Model has long reigned supreme as the most comprehensive and accurate description of reality that scientists have ever created. However, recent experimental results from the Muon g−2 Experiment at Fermilab in Batavia, Ill., have once again raised questions about the limits of this model.

The muon, a heavier cousin of the electron, possesses an internal magnetism that causes it to wobble when exposed to an external magnetic field. This wobbling, known as g−2, was initially predicted to have a specific value of 2 but is influenced by the presence of virtual particles in the quantum vacuum. The Standard Model can calculate the deviation of g−2 based on known particles, but any deviation from this calculated value could indicate the presence of new physics beyond the Standard Model.

The latest results from the Muon g−2 Experiment have provided the most precise measurement of g−2 to date, with a value of 0.001165920705. This result, with a precision of 127 parts per billion, has sparked debate among physicists about the implications for the Standard Model. While some theorists have adjusted their calculations to align more closely with the experimental results, others argue that the discrepancy between theory and experiment is still significant.

The Muon g−2 Theory Initiative, a collaborative effort involving over 100 theorists, aims to reconcile the discrepancies between theory and experiment. The group’s theoretical calculations have previously suggested a discrepancy with the measured values but have recently been revised to show better agreement. This shift has led to the conclusion that there is “no tension” between the Standard Model’s predictions and the experimental results.

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One of the key factors influencing these calculations is the contribution of virtual particles, particularly virtual hadrons, to the wobbling of muons. Hadrons, which are composed of quarks and gluons, can interact in complex ways that make their effects on g−2 difficult to calculate accurately. The uncertainty surrounding these calculations adds to the ongoing debate about whether the muon g−2 anomaly is a sign of new physics or merely a quirk of the Standard Model.

As physicists continue to analyze and interpret the results of the Muon g−2 Experiment, the quest for understanding the fundamental nature of particles and forces in the universe remains an ongoing and complex endeavor. The debate over the implications of these results serves as a reminder of the ever-evolving nature of scientific inquiry and the constant quest for deeper insights into the workings of the universe. Researchers have been working tirelessly to understand the muon g−2 anomaly, a discrepancy between the theoretical prediction and experimental measurement of the magnetic moment of the muon. One crucial factor in this calculation is the hadronic vacuum polarization (HVP) contribution, which was initially estimated indirectly by studying electrons.

In recent years, a new method for calculating the HVP contribution using lattice quantum chromodynamics (lattice QCD) has gained popularity. Gilberto Colangelo, a professor at the University of Bern in Switzerland, emphasizes the importance of the agreement among different lattice QCD approaches in providing a reliable result.

While the lattice QCD calculations have shown consistency and improvement, the experimental measurements based on electrons have faced challenges. Among seven experiments aimed at constraining the HVP contribution, only one aligned with the lattice QCD results, leading to discrepancies and puzzlement within the scientific community.

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As a result, the decision was made to rely solely on the lattice QCD results in this year’s white paper, bringing the predicted value of g−2 closer to Fermilab’s measurement. This move highlights the ongoing efforts to understand the discrepancies and refine the calculations.

Despite the uncertainties surrounding the muon g−2 anomaly, the Standard Model of particle physics remains robust and successful in explaining various phenomena. The potential resolution of the anomaly could impact theories beyond the Standard Model, such as supersymmetry, which have been proposed to account for the discrepancy.

Kim Siang Khaw, an associate professor at Shanghai Jiao Tong University, acknowledges the evolving nature of physics research and the need for patience in unraveling new discoveries. He emphasizes that whether or not an anomaly is detected, valuable insights about nature can be gained from the process.

In conclusion, the pursuit of understanding the muon g−2 anomaly continues to drive scientific exploration and innovation. The collaboration between theoretical calculations and experimental measurements is essential in unraveling the mysteries of particle physics and potentially uncovering new realms of physics beyond the Standard Model.

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