Measurement of the Positive Muon Anomalous Magnetic Moment to 0.7 ppm

Abstract

A higher precision measurement of the anomalous $g$ value, $a_{\mu }=(g-2)/2$, for the positive muon has been made at the Brookhaven Alternating Gradient Synchrotron, based on data collected in the year 2000. The result $a_{{\mu }^{+}}=11659204(7)(5)\times {10}^{-10}$ (0.7 ppm) is in good agreement with previous measurements and has an error about one-half that of the combined previous data. The present world average experimental value is $a_{\mu }(\mathrm{e}\mathrm{x}\mathrm{p}\mathrm{t})=11659203(8)\times {10}^{-10}$ (0.7 ppm).