Measurement of the Positive Muon Anomalous Magnetic Moment to 0.7 ppm

TL;DR

This paper reports a highly precise measurement of the positive muon’s anomalous magnetic moment, achieving a 0.7 ppm accuracy, which aligns with previous results and improves the overall precision of this fundamental constant.

Contribution

The paper presents a more precise measurement of the muon g-2 value, reducing the experimental error by half compared to previous data, enhancing the accuracy of fundamental physics tests.

Findings

Measured a_mu with 0.7 ppm precision

Results agree with previous measurements

Improved the overall experimental accuracy

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^+} = 11 659 204(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(exp) = 11 659 203(8) times 10^{-10} (0.7 ppm).