Status of the BNL Muon g-2 Experiment

TL;DR

The BNL Muon g-2 experiment has been collecting and analyzing data since 1997, achieving improved precision in measuring the muon anomalous magnetic moment, which currently agrees with standard theory, and is preparing for further data collection with different muon charges.

Contribution

This paper reports on the progress and results of the ongoing BNL Muon g-2 experiment, including data analysis improvements and future experimental plans.

Findings

Measured muon anomalous magnetic moment with 4 ppm precision

Results agree with standard theoretical predictions

Prepared for new data collection with negative muon beams

Abstract

The muon g-2 experiment at Brookhaven has been taking data since 1997. Analyses of the data taken in 1997 and 1998, which include about 2% of the data taken so far, have improved the experimental accuracy in the muon anomalous magnetic moment to a(mu,expt) = 1 165 921(5) x 10**(-9) (4 ppm). The value agrees with standard theory. Analysis of the 1999 data, about 25% of the existing data set, is nearing completion and analysis of the 2000 data has started. The experiment is preparing for another major data taking run, this time storing negative instead of positive muon beams.