Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm

Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm We present a new measurement of the positive muon magnetic anomaly, a_{μ}≡(g_{μ}-2)/2, from the Fermilab Muon g-2 Experiment using data collected in 2019 and 2020. We have analyzed more than 4 times the number of positrons from muon decay than in our previous result from 2018 data. The systematic error is reduced by more than a factor of 2 due to better running conditions, a more stable beam, and improved knowledge of the ma...