Abstract
The muon anomalous magnetic moment, aμ = (g – 2)/2, is a low-energy observable which can be both measured and computed with very high precision, making it an excellent test of the Standard Model (SM) and a sensitive probe of new physics. Recent efforts improved the precision of both the theoretical prediction and the experimental measurement. On the theory side, the Muon g – 2 Theory Initiative, an international team of more than 130 physicists, reached in 2020 a consensus on the SM prediction for aμ. On the experimental side, the E989 Muon g – 2 Collaboration at Fermilab (FNAL) published in April 2021 a new measurement of aμ from the Run-1 dataset (2018) with 0.46 ppm precision, corroborating the previous Brookhaven National Laboratory (BNL) measurement and increasing the discrepancy with the SM value to 4.2 standard deviations. In this paper, I will discuss the experimental setup and report on the current status of the experiment.
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