The Fermilab Muon $g-2$ straw tracking detectors, internal tracker alignment, and the muon EDM measurement

TL;DR

This paper details the alignment and performance of straw tracking detectors in Fermilab's muon g-2 experiment, crucial for precise magnetic anomaly measurement and setting a new limit on the muon EDM.

Contribution

It introduces the internal alignment procedure of the trackers and discusses their role in reducing systematic uncertainties in muon g-2 measurements.

Findings

Successful internal tracker alignment achieved

Accurate muon beam profile measurements obtained

New world-leading limit on muon EDM set

Abstract

The $g-2$ experiment successfully completed its second data taking period (Run-2) between March and July 2019, with the analysis of Run-1 and Run-2 data currently proceeding. The final goal of the experiment is to determine the muon magnetic anomaly, $a_{\mu}=\frac{g-2}{2}$, to a precision of 140 ppb. Essential to reducing the systematic uncertainty on $a_{\mu}$ through measurements of the muon beam profile are the in-vacuum straw tracking detectors. A crucial prerequisite to obtaining accurate distributions of the beam profile is the internal alignment of the trackers, which is described here, along with the resulting beam distributions. This paper also discusses an additional measurement that will be made using the trackers: setting a new limit on the electric dipole moment (EDM) of the muon, producing a world-leading measurement.