Muon g-2: the Final Measurement from Fermilab E989

The muon magnetic anomaly, a_mu= (g – 2)/2, can be both measured and computed to a very high precision, making it a powerful probe to test the Standard Model of particle physics and search for new physics. At the beginning of the 2000s, the E821 experiment at Brookhaven (USA) measured a_mu with a precision of about 540 parts per billion (ppb), finding a discrepancy at that time of about three standard deviations with the theoretical prediction of the Standard Model. Measurements based on the first three years of running of the Muon g−2 Experiment at Fermilab showed good agreement with the Brookhaven results with an improved precision of about 210 ppb. This talk will present the 2025 results based on the final 3 years of data from the Fermilab experiment, which when combined with the earlier results provides a final accuracy of 127 ppb on the magnetic anomaly from Fermilab.