Improved Measurement of the Positive Muon Anomalous Magnetic Moment
Abstract
A new measurement of the positive muon's anomalous magnetic moment has been made at the Brookhaven Alternating Gradient Synchrotron using the direct injection of polarized muons into the superferric storage ring. The angular frequency difference omegaa between the angular spin precession frequency omegas and the angular orbital frequency omegac is measured as well as the free proton NMR frequency omegap. These determine R = omegaa / omegap = 3.707~201(19) times 10-3. With mumu / mup = 3.183~345~39(10) this gives amu+ = 11~659~191(59) times 10-10 (pm 5 ppm), in good agreement with the previous CERN and BNL measurements for mu+ and mu-, and with the standard model prediction.
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