Measurement of muon momentum resolution of the ATLAS detector

TL;DR

This paper reports on the measurement of the muon momentum resolution of the ATLAS detector using collision data and alignment studies, crucial for precise muon measurements in high-energy physics.

Contribution

It presents a novel combined approach using decay events and straight track measurements to evaluate the muon momentum resolution in ATLAS.

Findings

Muon momentum resolution characterized up to TeV energies

Alignment accuracy of the detector quantified

Resolution measurements validated with decay data

Abstract

The ATLAS detector has been designed to have good muon momentum resolution up to momenta in the TeV range. The muon momentum resolution of the ATLAS spectrometer has been measured with p-p collision data recorded in 2011. The measurement combines the di-muon mass resolution in J/\Psi->\mu\mu and Z->\mu\mu decays with measurements of the alignment accuracy of the detector based on straight muon tracks, which are acquired with special runs without magnetic field in the ATLAS detector.