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Related Experiment Video

Updated: Oct 7, 2025

Setting Limits on Supersymmetry Using Simplified Models

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Muon (g- 2): experiment and theory.

James P Miller^1,2, Eduardo de Rafael³, B Lee Roberts¹

¹Department of Physics, Boston University, Boston, MA 02215, USA.

Reports on Progress in Physics. Physical Society (Great Britain)

|January 8, 2022

Summary

The anomalous magnetic moment of the muon is a precise probe for new physics beyond the Standard Model. Current experimental and theoretical values show a significant difference, indicating potential new discoveries.

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Last Updated: Oct 7, 2025

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Area of Science:

Particle Physics
Quantum Field Theory

Background:

The anomalous magnetic moment of the muon, denoted as 'a', is a fundamental property influenced by quantum effects.
Deviations from the Standard Model predictions can signal the existence of new particles or forces.
The muon anomaly is particularly sensitive to new physics due to its larger mass compared to the electron.

Purpose of the Study:

To review experimental and theoretical determinations of the muon's anomalous magnetic moment.
To assess the potential of the muon anomaly as a probe for new physics beyond the Standard Model.
To highlight the discrepancy between current theoretical and experimental values.

Main Methods:

Review of theoretical calculations incorporating radiative corrections and Standard Model contributions.
Summary of experimental measurements, including the E821 experiment at Brookhaven National Laboratory.
Comparison of theoretical predictions with experimental results to high precision (0.5 ppm).

Main Results:

Both theoretical and experimental values for the muon anomaly are known with high precision.
A statistically significant difference (3.4 standard deviations) exists between the current theoretical and experimental values.
This discrepancy suggests potential contributions from physics beyond the Standard Model.

Conclusions:

The muon anomaly serves as a crucial testbed for the Standard Model and searches for new physics.
Continued theoretical and experimental investigations are essential to resolve the observed discrepancy.
The high precision measurements offer strong constraints on speculative extensions to the Standard Model.