# The Muon $g-2$ experiment at Fermilab

## TL;DR

The Fermilab Muon g-2 experiment aims to precisely measure the muon magnetic anomaly to confirm or refute the current discrepancy suggesting new physics, with significant improvements over previous measurements.

## Contribution

This work reports on the first physics run and upgrades of the Fermilab Muon g-2 experiment, aiming to significantly reduce measurement uncertainty and clarify the anomaly.

## Key findings

- Initial data expected to reduce uncertainty by a factor of four.
- First results anticipated to be published in late-2019.
- Potential confirmation of new physics if discrepancy persists.

## Abstract

The current $\sim3.5\sigma$ discrepancy between the experimental measurement and theoretical prediction of the muon magnetic anomaly, $a_{\mu}$, stands as a potential indication of the existence of new physics. The Muon $g-2$ experiment at Fermilab is set to measure $a_{\mu}$ with a four-fold improvement in the uncertainty with respect to previous experiment, with an aim to determine whether the $g-2$ discrepancy is well established. The experiment recently completed its first physics run and a summer programme of essential upgrades, before continuing on with its experimental programme. The Run-1 data alone are expected to yield a statistical uncertainty of 350 ppb and the publication of the first result is expected in late-2019.