# The Muon g-2 experiment at Fermilab

## TL;DR

The Fermilab E989 experiment aims to precisely measure the muon anomalous magnetic moment to resolve discrepancies with the Standard Model, building on previous results and significantly improving measurement accuracy.

## Contribution

This paper reports the current status of the Fermilab E989 experiment, which seeks to enhance the precision of muon g-2 measurements by a factor of four.

## Key findings

- Preparation for high-precision measurement is underway.
- Expected reduction in uncertainty from 540 to 140 parts per billion.
- Potential to clarify the muon g-2 discrepancy with the Standard Model.

## Abstract

The upcoming Fermilab E989 experiment will measure the muon anomalous magnetic moment $a_{\mu}$ . This measurement is motivated by the previous measurement performed in 2001 by the BNL E821 experiment that reported a 3-4 standard deviation discrepancy between the measured value and the Standard Model prediction. The new measurement at Fermilab aims to improve the precision by a factor of four reducing the total uncertainty from 540 parts per billion (BNL E821) to 140 parts per billion (Fermilab E989). This paper gives the status of the experiment.