Precise Measurement of the Positive Muon Anomalous Magnetic Moment

TL;DR

This paper reports a highly precise measurement of the positive muon’s anomalous magnetic moment, which aligns with previous results and refines the experimental error, contributing to tests of the Standard Model.

Contribution

The study provides the most precise measurement to date of a_mu for the positive muon, reducing the experimental uncertainty by a factor of three compared to previous data.

Findings

Measured a_mu^+ = 11 659 202(14)(6) x 10^{-10}

Result agrees with previous measurements within uncertainties

Experimental error significantly reduced

Abstract

A precise measurement of the anomalous g value, a_mu=(g-2)/2, for the positive muon has been made at the Brookhaven Alternating Gradient Synchrotron. The result a_mu^+=11 659 202(14)(6) X 10^{-10} (1.3 ppm) is in good agreement with previous measurements and has an error one third that of the combined previous data. The current theoretical value from the standard model is a_mu(SM)=11 659 159.6(6.7) X 10^{-10} (0.57 ppm) and a_mu(exp)-a_mu(SM)=43(16) X 10^{-10} in which a_mu(exp) is the world average experimental value.