Measurement of the Negative Muon Anomalous Magnetic Moment to 0.7 ppm

TL;DR

This paper reports a highly precise measurement of the negative muon's anomalous magnetic moment, achieving 0.7 ppm accuracy, which confirms previous findings and enhances the precision of fundamental particle property measurements.

Contribution

The study provides the most precise measurement to date of the negative muon anomalous magnetic moment, improving accuracy over previous experiments by an order of magnitude.

Findings

Measured a_mu for negative muon at 0.7 ppm precision

Results consistent with previous positive and negative muon measurements

Enhanced the precision of fundamental muon property data

Abstract

The anomalous magnetic moment of the negative muon has been measured to a precision of 0.7 parts per million (ppm) at the Brookhaven Alternating Gradient Synchrotron. This result is based on data collected in 2001, and is over an order of magnitude more precise than the previous measurement of the negative muon. The result a_mu= 11 659 214(8)(3) \times 10^{-10} (0.7 ppm), where the first uncertainty is statistical and the second is sytematic, is consistend with previous measurements of the anomaly for the positive and negative muon. The average for the muon anomaly a_{mu}(exp) = 11 659 208(6) \times 10^{-10} (0.5ppm).